Then I change the Project Structure to target sdk version Android 4.4 (KitKat), it can be improved, but not 100%.
I have no idea is it related to new Android Studio/SDK? or related to new Android version? or related to individual device(s)?
Showing posts with label Android code sample: BlueTooth. Show all posts
Showing posts with label Android code sample: BlueTooth. Show all posts
Friday, April 29, 2016
Problem of BluetoothChat example
Last year (June 26, 2015) I have a post to show how to "Import Android code sample of BluetoothChat to Android Studio". It work perfectly AT THAT TIME. But I re-try it again on update Android Studio 2.1, and test on ASUS Zenfont 2 running Android 5.0 and XiaoMi RedMi 2 running Android 4.4.4; it almost NOT WORK - no problem in pairing and connecting, but fail to send/receive data: sometimes one-way chat, sometimes totally cannot chat!!!
Then I change the Project Structure to target sdk version Android 4.4 (KitKat), it can be improved, but not 100%.
I have no idea is it related to new Android Studio/SDK? or related to new Android version? or related to individual device(s)?
Then I change the Project Structure to target sdk version Android 4.4 (KitKat), it can be improved, but not 100%.
I have no idea is it related to new Android Studio/SDK? or related to new Android version? or related to individual device(s)?
Wednesday, November 4, 2015
Android Bluetooth Terminal
The post in my another blogspot show how to "Config Raspberry Pi to use HC-06 Bluetooth Module, as Serial Terminal".
My former post show how "Android communicate with Arduino + HC-06 Bluetooth Module" to link Android with other serial devices via bluetooth. Actually, it can communicate with Raspberry Pi + HC-06 also.
This example I re-code "Android communicate with Arduino + HC-06 Bluetooth Module" to make it work like a serial terminal to log-in Raspberry Pi via bluetooth.
- Prepare on Raspberry Pi 2, to config serial terminal work on 9600 baud, refer "Config Raspberry Pi to use HC-06 Bluetooth Module, as Serial Terminal".
- The Android and HC-06 have to pair in advance.
Create a new project of Blank Activity in Android Studio,
layout/content_main.xml, it's the main terminal screen.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
android:orientation="vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/body"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="@android:color/white"
android:background="@android:color/black"
android:typeface="monospace"
android:gravity="bottom"/>
</LinearLayout>
Edit layout/activity_main.xml, just to change the icon of the FloatingActionButton.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar android:id="@+id/toolbar"
android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<android.support.design.widget.FloatingActionButton android:id="@+id/fab"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_menu_edit" />
</android.support.design.widget.CoordinatorLayout>
Create layout/setting_layout.xml, the layout of SettingDialog (OptionsMenu -> Setting), to list paired bluetooth to connect.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/pairedlist"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
Create layout/typing_layout.xml, the layout of CmdLineDialog (open once FloatingActionButton is clicked), for user to enter command.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:id="@+id/cmdline"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/clearcmd"
android:layout_width="wrap_content"
android:src="@android:drawable/ic_menu_close_clear_cancel"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:id="@+id/clear"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Clear"/>
<Button
android:id="@+id/dismiss"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Dismiss"/>
<Button
android:id="@+id/enter"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Enter"/>
</LinearLayout>
</LinearLayout>
MainActivity.java
[remark: a bug here, refer Update@2015-11-11on bottom of this post.]
package com.blogspot.android_er.androidbluetoothterminal;
import android.app.Activity;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.method.ScrollingMovementMethod;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
ArrayList<BluetoothDevice> pairedDeviceArrayList;
ArrayAdapter<BluetoothDevice> pairedDeviceAdapter;
private static UUID myUUID;
private final String UUID_STRING_WELL_KNOWN_SPP =
"00001101-0000-1000-8000-00805F9B34FB";
ThreadConnectBTdevice myThreadConnectBTdevice;
ThreadConnected myThreadConnected;
static TextView body;
FloatingActionButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
body = (TextView)findViewById(R.id.body);
body.setMovementMethod(new ScrollingMovementMethod());
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showCmdLineDialog();
}
});
fab.setEnabled(false);
fab.setVisibility(FloatingActionButton.GONE);
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//using the well-known SPP UUID
myUUID = UUID.fromString(UUID_STRING_WELL_KNOWN_SPP);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String strInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
Toast.makeText(getApplicationContext(), strInfo, Toast.LENGTH_LONG).show();
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
closeThreads();
}
private void closeThreads(){
if(myThreadConnectBTdevice!=null){
myThreadConnectBTdevice.cancel();
myThreadConnectBTdevice = null;
}
if(myThreadConnected!=null){
myThreadConnected.cancel();
myThreadConnected = null;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
closeThreads();
fab.setEnabled(false);
fab.setVisibility(FloatingActionButton.GONE);
body.setText("");
showSettingDialog();
return true;
}
return super.onOptionsItemSelected(item);
}
void showSettingDialog() {
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment prev = getFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
DialogFragment newFragment = SettingDialogFragment.newInstance(MainActivity.this);
newFragment.show(ft, "dialog");
}
void showCmdLineDialog() {
if(myThreadConnected == null){
Toast.makeText(MainActivity.this,
"myThreadConnected == null",
Toast.LENGTH_LONG).show();
return;
}
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment prev = getFragmentManager().findFragmentByTag("cmdline");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
DialogFragment newFragment = TypingDialogFragment.newInstance(MainActivity.this, myThreadConnected);
newFragment.show(ft, "cmdline");
}
private void setup(ListView lv, final Dialog dialog) {
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
pairedDeviceArrayList = new ArrayList<BluetoothDevice>();
for (BluetoothDevice device : pairedDevices) {
pairedDeviceArrayList.add(device);
}
pairedDeviceAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, pairedDeviceArrayList);
lv.setAdapter(pairedDeviceAdapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
BluetoothDevice device =
(BluetoothDevice) parent.getItemAtPosition(position);
Toast.makeText(MainActivity.this,
"Name: " + device.getName() + "\n"
+ "Address: " + device.getAddress() + "\n"
+ "BondState: " + device.getBondState() + "\n"
+ "BluetoothClass: " + device.getBluetoothClass() + "\n"
+ "Class: " + device.getClass(),
Toast.LENGTH_LONG).show();
Toast.makeText(MainActivity.this, "start ThreadConnectBTdevice", Toast.LENGTH_LONG).show();
myThreadConnectBTdevice = new ThreadConnectBTdevice(device, dialog);
myThreadConnectBTdevice.start();
}
});
}
}
public static class SettingDialogFragment extends DialogFragment {
ListView listViewPairedDevice;
static MainActivity parentActivity;
static SettingDialogFragment newInstance(MainActivity parent){
parentActivity = parent;
SettingDialogFragment f = new SettingDialogFragment();
return f;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
getDialog().setTitle("Setting");
getDialog().setCanceledOnTouchOutside(false);
View settingDialogView = inflater.inflate(R.layout.setting_layout, container, false);
listViewPairedDevice = (ListView)settingDialogView.findViewById(R.id.pairedlist);
parentActivity.setup(listViewPairedDevice, getDialog());
return settingDialogView;
}
}
public static class TypingDialogFragment extends DialogFragment {
EditText cmdLine;
static MainActivity parentActivity;
static ThreadConnected cmdThreadConnected;
static TypingDialogFragment newInstance(MainActivity parent, ThreadConnected thread){
parentActivity = parent;
cmdThreadConnected = thread;
TypingDialogFragment f = new TypingDialogFragment();
return f;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
getDialog().setTitle("Cmd Line");
getDialog().setCanceledOnTouchOutside(false);
View typingDialogView = inflater.inflate(R.layout.typing_layout, container, false);
cmdLine = (EditText)typingDialogView.findViewById(R.id.cmdline);
ImageView imgCleaarCmd = (ImageView)typingDialogView.findViewById(R.id.clearcmd);
imgCleaarCmd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
cmdLine.setText("");
}
});
Button btnEnter = (Button)typingDialogView.findViewById(R.id.enter);
btnEnter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(cmdThreadConnected!=null){
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
cmdThreadConnected.write(bytesToSend);
byte[] NewLine = "\n".getBytes();
cmdThreadConnected.write(NewLine);
}
}
});
Button btnDismiss = (Button)typingDialogView.findViewById(R.id.dismiss);
btnDismiss.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
}
});
Button btnClear = (Button)typingDialogView.findViewById(R.id.clear);
btnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
body.setText("");
}
});
return typingDialogView;
}
}
//Called in ThreadConnectBTdevice once connect successed
//to start ThreadConnected
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnectBTdevice:
Background Thread to handle BlueTooth connecting
*/
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private final BluetoothDevice bluetoothDevice;
Dialog dialog;
private ThreadConnectBTdevice(BluetoothDevice device, Dialog dialog) {
this.dialog = dialog;
bluetoothDevice = device;
try {
bluetoothSocket = device.createRfcommSocketToServiceRecord(myUUID);
Toast.makeText(MainActivity.this,
"bluetoothSocket: \n" + bluetoothSocket,
Toast.LENGTH_SHORT).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e) {
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,
"something wrong bluetoothSocket.connect(): \n" + eMessage,
Toast.LENGTH_SHORT).show();
}
});
try {
bluetoothSocket.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(success){
//connect successful
final String msgconnected = "connect successful:\n"
+ "BluetoothSocket: " + bluetoothSocket + "\n"
+ "BluetoothDevice: " + bluetoothDevice;
runOnUiThread(new Runnable() {
@Override
public void run() {
fab.setEnabled(true);
fab.setVisibility(FloatingActionButton.VISIBLE);
body.setText("");
Toast.makeText(MainActivity.this, msgconnected, Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
startThreadConnected(bluetoothSocket);
}else{
//fail
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
boolean running;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
running = true;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
String strRx = "";
while (running) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived = new String(buffer, 0, bytes);
final String strByteCnt = String.valueOf(bytes) + " bytes received.\n";
runOnUiThread(new Runnable(){
@Override
public void run() {
body.append(strReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
Toast.makeText(MainActivity.this, msgConnectionLost, Toast.LENGTH_LONG).show();
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
running = false;
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
uses-permission of "android.permission.BLUETOOTH" is needed in src/main/AndroidManifest.xml.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blogspot.android_er.androidbluetoothterminal" >
<uses-permission android:name="android.permission.BLUETOOTH"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Download the files (Android Studio Format)
.Download APK .Update@2015-11-11:
In the above code of MainActivity.java, in run() of ThreadConnected, if Connection lost (such as Raspberry Pi or HC-06 power OFF), the thread will still keep running.
So have to cancel the thread and disable the FloatingActionButton. Modify run() of ThreadConnected.
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
String strRx = "";
while (running) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived = new String(buffer, 0, bytes);
final String strByteCnt = String.valueOf(bytes) + " bytes received.\n";
runOnUiThread(new Runnable(){
@Override
public void run() {
body.append(strReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
cancel();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
Toast.makeText(MainActivity.this, msgConnectionLost, Toast.LENGTH_LONG).show();
fab.setEnabled(false);
fab.setVisibility(FloatingActionButton.GONE);
}});
}
}
}
Saturday, October 31, 2015
Android Bluetooth connect PC (running Windows10) via HC-06 BT Module and FTDI US-to-Serial adapter
Last post show a "Android communicate with Arduino + HC-06 Bluetooth Module". Alternatively, the HC-06 can connect to PC via a FTDI USB-to-Serial adapter, such that Android can talk to PC by Bluetooth.
This video show how to:
Android side, refer to last post "Android communicate with Arduino + HC-06 Bluetooth Module", with source code and APK.
In my setup, both FT232RL (FTDI USB-to-Serial adapter) and HC-06 (Bluetooth Module) operate on 3.3V.
HC-06 VCC - FT232RL VCC *make sure both devices work on the same voltage.
HC-06 GND - FT232RL GND
HC-06 TXD - FT232RL RXD
HC-06 RXD - FT232RL TXD
PC running Windows 10, connect to FT232RL by USB.
Serial Monitor of Arduino IDE is used as a terminal to talk with Android.
Friday, October 30, 2015
Android communicate with Arduino + HC-06 Bluetooth Module, part II
It's my old post "Android example to communicate with Bluetooth device, HC-06 Bluetooth Module", to make a Android phone communicate with Arduino + HC-06 Bluetooth Module. In the example, the first byte always lost.
After more test, I found that the first byte not lost. Because the byte stream sent from Arduino not in sync with Android side, and the bytes may be separated in different slot received in Android ThreadConnected, and the old slot covered by the new slot.
To show it, I modify it not to clear the TextView.
MainActivity.java
layout/activity_main.xml
Have to modify AndroidManifest.xml to uses-permission of "android.permission.BLUETOOTH". Refer the exmple "Android example to communicate with Bluetooth device, HC-06 Bluetooth Module".
Download the files (Android Studio Format)
.
Download and try APK.
For the Arduino side, refer to : Arduino-er - Connect Arduino Due with HC-06 (Bluetooth Module).
This Android App can be used to talk with PC, with FTDI USB-to-Serial adapter connected to HC-06. Refer to the next post "Android Bluetooth connect PC (running Windows10) via HC-06 BT Module and FTDI US-to-Serial adapter".
more:
- Android Bluetooth Terminal to login Raspberry Pi + HC-06
After more test, I found that the first byte not lost. Because the byte stream sent from Arduino not in sync with Android side, and the bytes may be separated in different slot received in Android ThreadConnected, and the old slot covered by the new slot.
To show it, I modify it not to clear the TextView.
MainActivity.java
/*
Android Example to connect to and communicate with Bluetooth
In this exercise, the target is a Arduino Due + HC-06 (Bluetooth Module)
Ref:
- Make BlueTooth connection between Android devices
http://android-er.blogspot.com/2014/12/make-bluetooth-connection-between.html
- Bluetooth communication between Android devices
http://android-er.blogspot.com/2014/12/bluetooth-communication-between-android.html
*/
package com.example.androidbtcontrol;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends ActionBarActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
ArrayList<BluetoothDevice> pairedDeviceArrayList;
TextView textInfo, textStatus, textByteCnt;
ListView listViewPairedDevice;
LinearLayout inputPane;
EditText inputField;
Button btnSend, btnClear;
ArrayAdapter<BluetoothDevice> pairedDeviceAdapter;
private UUID myUUID;
private final String UUID_STRING_WELL_KNOWN_SPP =
"00001101-0000-1000-8000-00805F9B34FB";
ThreadConnectBTdevice myThreadConnectBTdevice;
ThreadConnected myThreadConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textInfo = (TextView)findViewById(R.id.info);
textStatus = (TextView)findViewById(R.id.status);
textByteCnt = (TextView)findViewById(R.id.textbyteCnt);
listViewPairedDevice = (ListView)findViewById(R.id.pairedlist);
inputPane = (LinearLayout)findViewById(R.id.inputpane);
inputField = (EditText)findViewById(R.id.input);
btnSend = (Button)findViewById(R.id.send);
btnSend.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
if(myThreadConnected!=null){
byte[] bytesToSend = inputField.getText().toString().getBytes();
myThreadConnected.write(bytesToSend);
byte[] NewLine = "\n".getBytes();
myThreadConnected.write(NewLine);
}
}});
btnClear = (Button)findViewById(R.id.clear);
btnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
textStatus.setText("");
textByteCnt.setText("");
}
});
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//using the well-known SPP UUID
myUUID = UUID.fromString(UUID_STRING_WELL_KNOWN_SPP);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String stInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
textInfo.setText(stInfo);
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
setup();
}
private void setup() {
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
pairedDeviceArrayList = new ArrayList<BluetoothDevice>();
for (BluetoothDevice device : pairedDevices) {
pairedDeviceArrayList.add(device);
}
pairedDeviceAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, pairedDeviceArrayList);
listViewPairedDevice.setAdapter(pairedDeviceAdapter);
listViewPairedDevice.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
BluetoothDevice device =
(BluetoothDevice) parent.getItemAtPosition(position);
Toast.makeText(MainActivity.this,
"Name: " + device.getName() + "\n"
+ "Address: " + device.getAddress() + "\n"
+ "BondState: " + device.getBondState() + "\n"
+ "BluetoothClass: " + device.getBluetoothClass() + "\n"
+ "Class: " + device.getClass(),
Toast.LENGTH_LONG).show();
textStatus.setText("start ThreadConnectBTdevice");
myThreadConnectBTdevice = new ThreadConnectBTdevice(device);
myThreadConnectBTdevice.start();
}
});
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(myThreadConnectBTdevice!=null){
myThreadConnectBTdevice.cancel();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
setup();
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
//Called in ThreadConnectBTdevice once connect successed
//to start ThreadConnected
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnectBTdevice:
Background Thread to handle BlueTooth connecting
*/
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private final BluetoothDevice bluetoothDevice;
private ThreadConnectBTdevice(BluetoothDevice device) {
bluetoothDevice = device;
try {
bluetoothSocket = device.createRfcommSocketToServiceRecord(myUUID);
textStatus.setText("bluetoothSocket: \n" + bluetoothSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e) {
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}
});
try {
bluetoothSocket.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(success){
//connect successful
final String msgconnected = "connect successful:\n"
+ "BluetoothSocket: " + bluetoothSocket + "\n"
+ "BluetoothDevice: " + bluetoothDevice;
runOnUiThread(new Runnable() {
@Override
public void run() {
textStatus.setText("");
textByteCnt.setText("");
Toast.makeText(MainActivity.this, msgconnected, Toast.LENGTH_LONG).show();
listViewPairedDevice.setVisibility(View.GONE);
inputPane.setVisibility(View.VISIBLE);
}
});
startThreadConnected(bluetoothSocket);
}else{
//fail
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
String strRx = "";
while (true) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived = new String(buffer, 0, bytes);
final String strByteCnt = String.valueOf(bytes) + " bytes received.\n";
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.append(strReceived);
textByteCnt.append(strByteCnt);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgConnectionLost);
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
layout/activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="horizontal"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/textbyteCnt"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"/>
<TextView
android:id="@+id/status"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/info"
android:textStyle="bold|italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/pairedlist"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:id="@+id/inputpane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Sent"/>
<Button
android:id="@+id/clear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Clear"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
Have to modify AndroidManifest.xml to uses-permission of "android.permission.BLUETOOTH". Refer the exmple "Android example to communicate with Bluetooth device, HC-06 Bluetooth Module".
Download the files (Android Studio Format)
.Download and try APK.For the Arduino side, refer to : Arduino-er - Connect Arduino Due with HC-06 (Bluetooth Module).
This Android App can be used to talk with PC, with FTDI USB-to-Serial adapter connected to HC-06. Refer to the next post "Android Bluetooth connect PC (running Windows10) via HC-06 BT Module and FTDI US-to-Serial adapter".
more:
- Android Bluetooth Terminal to login Raspberry Pi + HC-06
Sunday, July 19, 2015
Android Bluetooth to control LED brightness on Arduino Due + HC-06
Previous exercise "Android example to communicate with Bluetooth device, HC-06 Bluetooth Module" show how to send string. Here we implement our command format, such that we can use SeekBar on Android to control brightness of the Arduino Due on-board LED (pin 13), via Bluetooth to HC-06 Bluetooth Module.
Android Side:
com.example.androidbtcontrol.MainActivity.java
layout/activity_main.xml
uses-permission of "android.permission.BLUETOOTH" is needed in AndroidManifest.xml.
Download the files (Android Studio Format).
Arduino side:
Connection between Arduino and HC-06, refer to "Connect Arduino Due with HC-06 (Bluetooth Module)".
DueHC06_AT.ino
You can also monitor the state on PC using Serial Monitor.
Android Side:
com.example.androidbtcontrol.MainActivity.java
/*
Android Example to connect to and communicate with Bluetooth
In this exercise, the target is a Arduino Due + HC-06 (Bluetooth Module)
*/
package com.example.androidbtcontrol;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends ActionBarActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
ArrayList<BluetoothDevice> pairedDeviceArrayList;
TextView textInfo, textStatus;
ListView listViewPairedDevice;
LinearLayout inputPane;
SeekBar barAnalogOut;
ArrayAdapter<BluetoothDevice> pairedDeviceAdapter;
private UUID myUUID;
private final String UUID_STRING_WELL_KNOWN_SPP =
"00001101-0000-1000-8000-00805F9B34FB";
ThreadConnectBTdevice myThreadConnectBTdevice;
ThreadConnected myThreadConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textInfo = (TextView)findViewById(R.id.info);
textStatus = (TextView)findViewById(R.id.status);
listViewPairedDevice = (ListView)findViewById(R.id.pairedlist);
inputPane = (LinearLayout)findViewById(R.id.inputpane);
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//using the well-known SPP UUID
myUUID = UUID.fromString(UUID_STRING_WELL_KNOWN_SPP);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String stInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
textInfo.setText(stInfo);
barAnalogOut = (SeekBar)findViewById(R.id.analogOut);
barAnalogOut.setOnSeekBarChangeListener(OnAnalogOutChangeListener);
}
SeekBar.OnSeekBarChangeListener OnAnalogOutChangeListener =
new SeekBar.OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
//will generate too much data sent!
//SendAnalogOut(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
SendAnalogOut(seekBar.getProgress());
}
};
private final byte SYNC_BYTE = (byte) 0xAA;
private final byte LENGTH_ANALOG = (byte) 3;
private final byte CMD_ANALOG = (byte) 1;
private void SendAnalogOut(int val){
byte[] bytesToSend = {SYNC_BYTE, LENGTH_ANALOG, CMD_ANALOG, (byte) val};
myThreadConnected.write(bytesToSend);
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
setup();
}
private void setup() {
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
pairedDeviceArrayList = new ArrayList<BluetoothDevice>();
for (BluetoothDevice device : pairedDevices) {
pairedDeviceArrayList.add(device);
}
pairedDeviceAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, pairedDeviceArrayList);
listViewPairedDevice.setAdapter(pairedDeviceAdapter);
listViewPairedDevice.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
BluetoothDevice device =
(BluetoothDevice) parent.getItemAtPosition(position);
Toast.makeText(MainActivity.this,
"Name: " + device.getName() + "\n"
+ "Address: " + device.getAddress() + "\n"
+ "BondState: " + device.getBondState() + "\n"
+ "BluetoothClass: " + device.getBluetoothClass() + "\n"
+ "Class: " + device.getClass(),
Toast.LENGTH_LONG).show();
textStatus.setText("start ThreadConnectBTdevice");
myThreadConnectBTdevice = new ThreadConnectBTdevice(device);
myThreadConnectBTdevice.start();
}
});
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(myThreadConnectBTdevice!=null){
myThreadConnectBTdevice.cancel();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
setup();
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
//Called in ThreadConnectBTdevice once connect successed
//to start ThreadConnected
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnectBTdevice:
Background Thread to handle BlueTooth connecting
*/
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private final BluetoothDevice bluetoothDevice;
private ThreadConnectBTdevice(BluetoothDevice device) {
bluetoothDevice = device;
try {
bluetoothSocket = device.createRfcommSocketToServiceRecord(myUUID);
textStatus.setText("bluetoothSocket: \n" + bluetoothSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e) {
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}
});
try {
bluetoothSocket.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(success){
//connect successful
final String msgconnected = "connect successful:\n"
+ "BluetoothSocket: " + bluetoothSocket + "\n"
+ "BluetoothDevice: " + bluetoothDevice;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgconnected);
listViewPairedDevice.setVisibility(View.GONE);
inputPane.setVisibility(View.VISIBLE);
}});
startThreadConnected(bluetoothSocket);
}else{
//fail
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
String strReceived = new String(buffer, 0, bytes);
final String msgReceived = String.valueOf(bytes) +
" bytes received:\n"
+ strReceived;
runOnUiThread(new Runnable() {
@Override
public void run() {
textStatus.setText(msgReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgConnectionLost);
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
layout/activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/info"
android:textStyle="bold|italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/status"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/pairedlist"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:id="@+id/inputpane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<SeekBar
android:id="@+id/analogOut"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="99"
android:progress="0"/>
</LinearLayout>
</LinearLayout>
uses-permission of "android.permission.BLUETOOTH" is needed in AndroidManifest.xml.
Download the files (Android Studio Format).Arduino side:
DueHC06_AT.ino
/*
Arduino Due + HC-06 (Bluetooth) -
receive command to control LED (pin 13) brightness
Serial (Tx/Rx) communicate to PC via USB
Serial3 (Tx3/Rx3) connect to HC-06
HC-06 Rx - Due Tx3
HC-06 Tx - Due Rx3
HC-06 GND - Due GND
HC-06 VCC - Due 3.3V
*/
#define HC06 Serial3
int SYNC_BYTE = 0xAA;
int CMD_ANALOG = 1;
int rxState;
int rxLength;
int rxCmd;
const int rxState_0_idle = 0;
const int rxState_1_sync = 1; //SYNC_BYTE received
const int rxState_2_cmd = 2; //length received, waiting CMD
const int rxState_3_data = 3; //CMD received, receiving data
int LED = 13;
void setup()
{
pinMode(LED, OUTPUT);
delay(1000);
Serial.begin(9600);
HC06.begin(9600);
Serial.write("\nTest Start\n");
rxState = rxState_0_idle;
}
void loop()
{
while(HC06.available())
{
char rxData = (int)HC06.read();
switch(rxState){
case rxState_0_idle:
if(rxData == SYNC_BYTE){
rxState = rxState_1_sync;
Serial.println("SYNC_BYTE received");
}
break;
case rxState_1_sync:
rxLength = rxData;
Serial.println("Length: " + String(rxLength));
rxLength--;
rxState = rxState_2_cmd;
break;
case rxState_2_cmd:
rxCmd = rxData;
Serial.println("CMD: " + String(rxCmd));
rxLength--;
rxState = rxState_3_data;
break;
case rxState_3_data:
Serial.println("data: " + String(rxData));
//we have one command only
if(rxCmd==CMD_ANALOG){
int brightness = map(rxData, 0, 99, 0, 255);
analogWrite(LED, brightness);
Serial.println("brightness: " + String(brightness));
HC06.println("brightness: " + String(brightness));
}
rxLength--;
if(rxLength==0){
rxState = rxState_0_idle;
}
break;
default:
rxState = rxState_0_idle;
};
}
}
You can also monitor the state on PC using Serial Monitor.
Saturday, July 18, 2015
Android example to communicate with Bluetooth device, HC-06 Bluetooth Module
The former exercise "Test HC-06 Bluetooth Module with Android BluetoothChat" show how to communicate between Android and HC-06 Bluetooth Module, using "Android BluetoothChat example".
And the post in my another blog "Arduino-er: Connect Arduino Due with HC-06 (Bluetooth Module)", show how to receive data from HC-06, send back to Bluetooth device and PC via USB.
Here, we are going to implement our own Android app (in Android Studio) to connect and communicate to Arduino Due + HC-06 Bluetooth Module. Actually, it is copied (with modified UUID) from my old example "Bluetooth communication between Android devices", AndroidBlueTooth part.
From the video, it can be noted that the first character always missed, or overwritten. We can verify it in Arduino IDE's Serial Monitor, the data received on Arduino Due (via Bluetooth) is correct.
[Updated@2015-10-31: Lost character Fixed, refer "Android communicate with Arduino + HC-06 Bluetooth Module, part II"]
com.example.androidbtcontrol.MainActivity.java
layout/activity_main.xml
Have to modify AndroidManifest.xml to uses-permission of "android.permission.BLUETOOTH".
Download the files (Android Studio Format).
Next:
- Android Bluetooth to control LED brightness on Arduino Due + HC-06
And the post in my another blog "Arduino-er: Connect Arduino Due with HC-06 (Bluetooth Module)", show how to receive data from HC-06, send back to Bluetooth device and PC via USB.
Here, we are going to implement our own Android app (in Android Studio) to connect and communicate to Arduino Due + HC-06 Bluetooth Module. Actually, it is copied (with modified UUID) from my old example "Bluetooth communication between Android devices", AndroidBlueTooth part.
From the video, it can be noted that the first character always missed, or overwritten. We can verify it in Arduino IDE's Serial Monitor, the data received on Arduino Due (via Bluetooth) is correct.
[Updated@2015-10-31: Lost character Fixed, refer "Android communicate with Arduino + HC-06 Bluetooth Module, part II"]
com.example.androidbtcontrol.MainActivity.java
/*
Android Example to connect to and communicate with Bluetooth
In this exercise, the target is a Arduino Due + HC-06 (Bluetooth Module)
Ref:
- Make BlueTooth connection between Android devices
http://android-er.blogspot.com/2014/12/make-bluetooth-connection-between.html
- Bluetooth communication between Android devices
http://android-er.blogspot.com/2014/12/bluetooth-communication-between-android.html
*/
package com.example.androidbtcontrol;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends ActionBarActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
ArrayList<BluetoothDevice> pairedDeviceArrayList;
TextView textInfo, textStatus;
ListView listViewPairedDevice;
LinearLayout inputPane;
EditText inputField;
Button btnSend;
ArrayAdapter<BluetoothDevice> pairedDeviceAdapter;
private UUID myUUID;
private final String UUID_STRING_WELL_KNOWN_SPP =
"00001101-0000-1000-8000-00805F9B34FB";
ThreadConnectBTdevice myThreadConnectBTdevice;
ThreadConnected myThreadConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textInfo = (TextView)findViewById(R.id.info);
textStatus = (TextView)findViewById(R.id.status);
listViewPairedDevice = (ListView)findViewById(R.id.pairedlist);
inputPane = (LinearLayout)findViewById(R.id.inputpane);
inputField = (EditText)findViewById(R.id.input);
btnSend = (Button)findViewById(R.id.send);
btnSend.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
if(myThreadConnected!=null){
byte[] bytesToSend = inputField.getText().toString().getBytes();
myThreadConnected.write(bytesToSend);
}
}});
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//using the well-known SPP UUID
myUUID = UUID.fromString(UUID_STRING_WELL_KNOWN_SPP);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String stInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
textInfo.setText(stInfo);
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
setup();
}
private void setup() {
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
pairedDeviceArrayList = new ArrayList<BluetoothDevice>();
for (BluetoothDevice device : pairedDevices) {
pairedDeviceArrayList.add(device);
}
pairedDeviceAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, pairedDeviceArrayList);
listViewPairedDevice.setAdapter(pairedDeviceAdapter);
listViewPairedDevice.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
BluetoothDevice device =
(BluetoothDevice) parent.getItemAtPosition(position);
Toast.makeText(MainActivity.this,
"Name: " + device.getName() + "\n"
+ "Address: " + device.getAddress() + "\n"
+ "BondState: " + device.getBondState() + "\n"
+ "BluetoothClass: " + device.getBluetoothClass() + "\n"
+ "Class: " + device.getClass(),
Toast.LENGTH_LONG).show();
textStatus.setText("start ThreadConnectBTdevice");
myThreadConnectBTdevice = new ThreadConnectBTdevice(device);
myThreadConnectBTdevice.start();
}
});
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(myThreadConnectBTdevice!=null){
myThreadConnectBTdevice.cancel();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
setup();
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
//Called in ThreadConnectBTdevice once connect successed
//to start ThreadConnected
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnectBTdevice:
Background Thread to handle BlueTooth connecting
*/
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private final BluetoothDevice bluetoothDevice;
private ThreadConnectBTdevice(BluetoothDevice device) {
bluetoothDevice = device;
try {
bluetoothSocket = device.createRfcommSocketToServiceRecord(myUUID);
textStatus.setText("bluetoothSocket: \n" + bluetoothSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e) {
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}
});
try {
bluetoothSocket.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(success){
//connect successful
final String msgconnected = "connect successful:\n"
+ "BluetoothSocket: " + bluetoothSocket + "\n"
+ "BluetoothDevice: " + bluetoothDevice;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgconnected);
listViewPairedDevice.setVisibility(View.GONE);
inputPane.setVisibility(View.VISIBLE);
}});
startThreadConnected(bluetoothSocket);
}else{
//fail
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
String strReceived = new String(buffer, 0, bytes);
final String msgReceived = String.valueOf(bytes) +
" bytes received:\n"
+ strReceived;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgConnectionLost);
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
layout/activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/info"
android:textStyle="bold|italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/status"
android:textSize="28sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/pairedlist"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:id="@+id/inputpane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Sent"/>
</LinearLayout>
</LinearLayout>
Have to modify AndroidManifest.xml to uses-permission of "android.permission.BLUETOOTH".
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidbtcontrol" >
<uses-permission android:name="android.permission.BLUETOOTH"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Next:
- Android Bluetooth to control LED brightness on Arduino Due + HC-06
Wednesday, July 1, 2015
Test HC-06 Bluetooth Module with Android BluetoothChat
HC-06 is a low cost bluetooth module (slave mode only). This post show how to test it using the Android code sample of BluetoothChat.
Connection on HC-06 Bluetooth module:
VCC - connect to 3.3V
GND - connect to GND
RXD connect to TXD, to make it in loop-back mode.
In Android side, we will use the Android code sample of BluetoothChat. To make it work with HC-06, we have to modify the UUID. Refer to Android document http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html, If you are connecting to a Bluetooth serial board then try using the well-known SPP UUID 00001101-0000-1000-8000-00805F9B34FB. Open file file com.example.android.bluetoothchat.BluetoothChatService.java in Android Studio, replace the code:
to:
Then re-build, install and test it.
Test HC-06 Bluetooth Module with Android BluetoothChat
- Power on HC-06 (*caution 3.3V), the HC-06 LED will blink, to show it is not connected.
- Turn on Bluetooth on Android, pair with HC-06 with default password "1234". After paired, the LED on HC-06 still blink.
- Run the BluetoothChat example on Android, connect to HC-06. After connected, the LED stop blinking.
- Now you can enter text to test the bluetooth connection.
- Anything HC-06 received will echo back to Android. But in my test, sometimes the first character will be incorrect.
Next:
- Android example to communicate with Bluetooth device, HC-06 Bluetooth Module
Connection on HC-06 Bluetooth module:
VCC - connect to 3.3V
GND - connect to GND
RXD connect to TXD, to make it in loop-back mode.
In Android side, we will use the Android code sample of BluetoothChat. To make it work with HC-06, we have to modify the UUID. Refer to Android document http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html, If you are connecting to a Bluetooth serial board then try using the well-known SPP UUID 00001101-0000-1000-8000-00805F9B34FB. Open file file com.example.android.bluetoothchat.BluetoothChatService.java in Android Studio, replace the code:
private static final UUID MY_UUID_SECURE =
UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
to:
private static final UUID MY_UUID_SECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
Then re-build, install and test it.
Test HC-06 Bluetooth Module with Android BluetoothChat
- Power on HC-06 (*caution 3.3V), the HC-06 LED will blink, to show it is not connected.
- Turn on Bluetooth on Android, pair with HC-06 with default password "1234". After paired, the LED on HC-06 still blink.
- Run the BluetoothChat example on Android, connect to HC-06. After connected, the LED stop blinking.
- Now you can enter text to test the bluetooth connection.
- Anything HC-06 received will echo back to Android. But in my test, sometimes the first character will be incorrect.
Next:
- Android example to communicate with Bluetooth device, HC-06 Bluetooth Module
Friday, June 26, 2015
Import Android code sample of BluetoothChat to Android Studio
The Android code sample of BluetoothChat shows how to implement two-way text chat over Bluetooth between two Android devices, using all the fundamental Bluetooth API capabilities.
The sample demonstrates the following, using the Bluetooth API:
- Setting up Bluetooth
- Scanning for other Bluetooth devices
- Querying the local Bluetooth adapter for paired Bluetooth devices
- Establishing RFCOMM channels/sockets
- Connecting to a remote device
- Transfering data over Bluetooth
This video show how to import the Android code sample of BluetoothChat to Android Studio.
updated@2016-04-29:
I re-tried this example and found problem: refer "Problem of BluetoothChat example".
Related:
- Test HC-06 Bluetooth Module with Android BluetoothChat
Sunday, December 28, 2014
Bluetooth communication between Android devices
This exercise implement bi-direction Bluetooth communication between Android devices. After connection made in last post "Make BlueTooth connection between Android devices", start another thread, ThreadConnected, to handle read and write once BluetoothSocket established. If any case make the connection lost, the program will not re-connect, so you have to quit and re-start it.
please notice that it is just a exercise to study bluetooth, not a completed example.
AndroidBlueToothBeCOnnected:
MainActivity.java
activity_main.xml
Download the files.
AndroidBlueTooth:
MainActivity.java
activity_main.xml
Download the files.
Remark: both side have to modify AndroidManifest.xml to add permission of "android.permission.BLUETOOTH".
Related:
- Android example to communicate with Bluetooth device, HC-06 Bluetooth Module
please notice that it is just a exercise to study bluetooth, not a completed example.
AndroidBlueToothBeCOnnected:
MainActivity.java
package com.example.androidbluetoothbeconnected;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
private UUID myUUID;
private String myName;
LinearLayout inputPane;
EditText inputField;
Button btnSend;
TextView textInfo, textStatus;
ThreadBeConnected myThreadBeConnected;
ThreadConnected myThreadConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textInfo = (TextView)findViewById(R.id.info);
textStatus = (TextView)findViewById(R.id.status);
inputPane = (LinearLayout)findViewById(R.id.inputpane);
inputField = (EditText)findViewById(R.id.input);
btnSend = (Button)findViewById(R.id.send);
btnSend.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(myThreadConnected!=null){
byte[] bytesToSend = inputField.getText().toString().getBytes();
myThreadConnected.write(bytesToSend);
}
}});
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//generate UUID on web: http://www.famkruithof.net/uuid/uuidgen
//have to match the UUID on the another device of the BT connection
myUUID = UUID.fromString("ec79da00-853f-11e4-b4a9-0800200c9a66");
myName = myUUID.toString();
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String stInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
textInfo.setText(stInfo);
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
setup();
}
private void setup() {
textStatus.setText("setup()");
myThreadBeConnected = new ThreadBeConnected();
myThreadBeConnected.start();
}
@Override
protected void onDestroy() {
super.onDestroy();
if(myThreadBeConnected!=null){
myThreadBeConnected.cancel();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
setup();
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
private class ThreadBeConnected extends Thread {
private BluetoothServerSocket bluetoothServerSocket = null;
public ThreadBeConnected() {
try {
bluetoothServerSocket =
bluetoothAdapter.listenUsingRfcommWithServiceRecord(myName, myUUID);
textStatus.setText("Waiting\n"
+ "bluetoothServerSocket :\n"
+ bluetoothServerSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
BluetoothSocket bluetoothSocket = null;
if(bluetoothServerSocket!=null){
try {
bluetoothSocket = bluetoothServerSocket.accept();
BluetoothDevice remoteDevice = bluetoothSocket.getRemoteDevice();
final String strConnected = "Connected:\n" +
remoteDevice.getName() + "\n" +
remoteDevice.getAddress();
//connected
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(strConnected);
inputPane.setVisibility(View.VISIBLE);
}});
startThreadConnected(bluetoothSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText("something wrong: \n" + eMessage);
}});
}
}else{
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText("bluetoothServerSocket == null");
}});
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothServerSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothServerSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
String strReceived = new String(buffer, 0, bytes);
final String msgReceived = String.valueOf(bytes) +
" bytes received:\n"
+ strReceived;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgConnectionLost);
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
connectedOutputStream.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.androidbluetoothbeconnected.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/info"
android:textStyle="bold|italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/status"
android:textSize="28sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/inputpane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Sent"/>
</LinearLayout>
</LinearLayout>
AndroidBlueTooth:
MainActivity.java
package com.example.androidbluetooth;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private static final int REQUEST_ENABLE_BT = 1;
BluetoothAdapter bluetoothAdapter;
ArrayList<BluetoothDevice> pairedDeviceArrayList;
TextView textInfo, textStatus;
ListView listViewPairedDevice;
ArrayAdapter<BluetoothDevice> pairedDeviceAdapter;
private UUID myUUID;
LinearLayout inputPane;
EditText inputField;
Button btnSend;
ThreadConnectBTdevice myThreadConnectBTdevice;
ThreadConnected myThreadConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textInfo = (TextView)findViewById(R.id.info);
textStatus = (TextView)findViewById(R.id.status);
listViewPairedDevice = (ListView)findViewById(R.id.pairedlist);
inputPane = (LinearLayout)findViewById(R.id.inputpane);
inputField = (EditText)findViewById(R.id.input);
btnSend = (Button)findViewById(R.id.send);
btnSend.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(myThreadConnected!=null){
byte[] bytesToSend = inputField.getText().toString().getBytes();
myThreadConnected.write(bytesToSend);
}
}});
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
Toast.makeText(this,
"FEATURE_BLUETOOTH NOT support",
Toast.LENGTH_LONG).show();
finish();
return;
}
//generate UUID on web: http://www.famkruithof.net/uuid/uuidgen
//have to match the UUID on the another device of the BT connection
myUUID = UUID.fromString("ec79da00-853f-11e4-b4a9-0800200c9a66");
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not supported on this hardware platform",
Toast.LENGTH_LONG).show();
finish();
return;
}
String stInfo = bluetoothAdapter.getName() + "\n" +
bluetoothAdapter.getAddress();
textInfo.setText(stInfo);
}
@Override
protected void onStart() {
super.onStart();
//Turn ON BlueTooth if it is OFF
if (!bluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
setup();
}
private void setup() {
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
pairedDeviceArrayList = new ArrayList<BluetoothDevice>();
for (BluetoothDevice device : pairedDevices) {
pairedDeviceArrayList.add(device);
}
pairedDeviceAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, pairedDeviceArrayList);
listViewPairedDevice.setAdapter(pairedDeviceAdapter);
listViewPairedDevice.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
BluetoothDevice device =
(BluetoothDevice)parent.getItemAtPosition(position);
Toast.makeText(MainActivity.this,
"Name: " + device.getName() + "\n"
+ "Address: " + device.getAddress() + "\n"
+ "BondState: " + device.getBondState() + "\n"
+ "BluetoothClass: " + device.getBluetoothClass() + "\n"
+ "Class: " + device.getClass(),
Toast.LENGTH_LONG).show();
textStatus.setText("start ThreadConnectBTdevice");
myThreadConnectBTdevice = new ThreadConnectBTdevice(device);
myThreadConnectBTdevice.start();
}});
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(myThreadConnectBTdevice!=null){
myThreadConnectBTdevice.cancel();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==REQUEST_ENABLE_BT){
if(resultCode == Activity.RESULT_OK){
setup();
}else{
Toast.makeText(this,
"BlueTooth NOT enabled",
Toast.LENGTH_SHORT).show();
finish();
}
}
}
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private final BluetoothDevice bluetoothDevice;
public ThreadConnectBTdevice(BluetoothDevice device) {
bluetoothDevice = device;
try {
bluetoothSocket = device.createRfcommSocketToServiceRecord(myUUID);
textStatus.setText("bluetoothSocket: \n" + bluetoothSocket);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e) {
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}});
try {
bluetoothSocket.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(success){
//connect successful
final String msgconnected = "connect successful:\n"
+ "BluetoothSocket: " + bluetoothSocket + "\n"
+ "BluetoothDevice: " + bluetoothDevice;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgconnected);
listViewPairedDevice.setVisibility(View.GONE);
inputPane.setVisibility(View.VISIBLE);
}});
startThreadConnected(bluetoothSocket);
}else{
//fail
}
}
public void cancel() {
Toast.makeText(getApplicationContext(),
"close bluetoothSocket",
Toast.LENGTH_LONG).show();
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void startThreadConnected(BluetoothSocket socket){
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
String strReceived = new String(buffer, 0, bytes);
final String msgReceived = String.valueOf(bytes) +
" bytes received:\n"
+ strReceived;
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgReceived);
}});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable(){
@Override
public void run() {
textStatus.setText(msgConnectionLost);
}});
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.androidbluetooth.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<TextView
android:id="@+id/info"
android:textStyle="bold|italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/status"
android:textSize="28sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/pairedlist"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:id="@+id/inputpane"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Sent"/>
</LinearLayout>
</LinearLayout>
Remark: both side have to modify AndroidManifest.xml to add permission of "android.permission.BLUETOOTH".
Related:
- Android example to communicate with Bluetooth device, HC-06 Bluetooth Module
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