Get the list of paired Bluetooth devices

With bluetoothAdapter, the list of paired BluetoothDevice can be retrieved by calling getBondedDevices() function.



Implement a new activity ListPairedDevicesActivity.java

package com.exercise.AndroidBluetooth;

import java.util.Set;

import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ListPairedDevicesActivity extends ListActivity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);

  ArrayAdapter<String> btArrayAdapter 
    = new ArrayAdapter<String>(this,
             android.R.layout.simple_list_item_1);
  
  BluetoothAdapter bluetoothAdapter 
   = BluetoothAdapter.getDefaultAdapter();
  Set<BluetoothDevice> pairedDevices 
   = bluetoothAdapter.getBondedDevices();

  if (pairedDevices.size() > 0) {
      for (BluetoothDevice device : pairedDevices) {
       String deviceBTName = device.getName();
       String deviceBTMajorClass 
        = getBTMajorDeviceClass(device
          .getBluetoothClass()
          .getMajorDeviceClass());
       btArrayAdapter.add(deviceBTName + "\n" 
         + deviceBTMajorClass);
      }
  }
  setListAdapter(btArrayAdapter);
  
 }
 
 private String getBTMajorDeviceClass(int major){
  switch(major){ 
  case BluetoothClass.Device.Major.AUDIO_VIDEO:
   return "AUDIO_VIDEO";
  case BluetoothClass.Device.Major.COMPUTER:
   return "COMPUTER";
  case BluetoothClass.Device.Major.HEALTH:
   return "HEALTH";
  case BluetoothClass.Device.Major.IMAGING:
   return "IMAGING"; 
  case BluetoothClass.Device.Major.MISC:
   return "MISC";
  case BluetoothClass.Device.Major.NETWORKING:
   return "NETWORKING"; 
  case BluetoothClass.Device.Major.PERIPHERAL:
   return "PERIPHERAL";
  case BluetoothClass.Device.Major.PHONE:
   return "PHONE";
  case BluetoothClass.Device.Major.TOY:
   return "TOY";
  case BluetoothClass.Device.Major.UNCATEGORIZED:
   return "UNCATEGORIZED";
  case BluetoothClass.Device.Major.WEARABLE:
   return "AUDIO_VIDEO";
  default: return "unknown!";
  }
 }

 @Override
 protected void onListItemClick(ListView l, View v, int position, long id) {
  // TODO Auto-generated method stub
  super.onListItemClick(l, v, position, id);
  
     Intent intent = new Intent();
     setResult(RESULT_OK, intent);
     finish();
 }
 
}

Modify main.xml to add a button to start ListPairedDevicesActivity.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<TextView 
    android:id="@+id/bluetoothstate" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<Button
    android:id="@+id/listpaireddevices" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:text="List Paired Devices" 
    android:enabled="false"
    /> 
<TextView
    android:id="@+id/bluetoothstate" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

Modify AndroidBluetooth.java

package com.exercise.AndroidBluetooth;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidBluetooth extends Activity {
 
 private static final int REQUEST_ENABLE_BT = 1;
 private static final int REQUEST_PAIRED_DEVICE = 2;
 
    /** Called when the activity is first created. */
 Button btnListPairedDevices;
 TextView stateBluetooth;
 BluetoothAdapter bluetoothAdapter;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        btnListPairedDevices = (Button)findViewById(R.id.listpaireddevices);
        
        stateBluetooth = (TextView)findViewById(R.id.bluetoothstate);
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        
        CheckBlueToothState();
        
        btnListPairedDevices.setOnClickListener(btnListPairedDevicesOnClickListener);
    }
    
    private void CheckBlueToothState(){
     if (bluetoothAdapter == null){
         stateBluetooth.setText("Bluetooth NOT support");
        }else{
         if (bluetoothAdapter.isEnabled()){
          if(bluetoothAdapter.isDiscovering()){
           stateBluetooth.setText("Bluetooth is currently in device discovery process.");
          }else{
           stateBluetooth.setText("Bluetooth is Enabled.");
           btnListPairedDevices.setEnabled(true);
          }
         }else{
          stateBluetooth.setText("Bluetooth is NOT Enabled!");
          Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
             startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
         }
        }
    }
    
    private Button.OnClickListener btnListPairedDevicesOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   Intent intent = new Intent();
   intent.setClass(AndroidBluetooth.this, ListPairedDevicesActivity.class);
   startActivityForResult(intent, REQUEST_PAIRED_DEVICE); 
  }};

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if(requestCode == REQUEST_ENABLE_BT){
   CheckBlueToothState();
  }if (requestCode == REQUEST_PAIRED_DEVICE){
   if(resultCode == RESULT_OK){

   }
  } 
 }   
}

Modify AndroidManifest.xml to add activity ListPairedDevicesActivity, also include permission of "android.permission.BLUETOOTH".

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.exercise.AndroidBluetooth"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="7" />
    <uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AndroidBluetooth"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
  <activity android:name=".ListPairedDevicesActivity" 
      android:label="AndroidBluetooth: List of Paired Devices"/>
    </application>
</manifest>

Download the files.


Related:
- Detect Bluetooth state
- Turn-On BlueTooth using intent of BluetoothAdapter.ACTION_REQUEST_ENABLE
- Start Bluetooth Discoverable and register BroadcastReceiver for ACTION_SCAN_MODE_CHANGED