Sunday, November 15, 2015

Android App to control Standalone ESP8266/ESP-12 on-board LED, using HttpClient

I have a example in my another blog "Arduino-er: Standalone ESP8266/ESP-12: web control on-board LED". We can control the on-board LED via web. It's Android App to control the on-board using HttpClient.




MainActivity.java
package com.blogspot.android_er.androidespwebled;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;

public class MainActivity extends AppCompatActivity {

    EditText editIp;
    Button btnOn, btnOff;
    TextView textInfo1, textInfo2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editIp = (EditText)findViewById(R.id.ip);
        btnOn = (Button)findViewById(R.id.bon);
        btnOff = (Button)findViewById(R.id.boff);
        textInfo1 = (TextView)findViewById(R.id.info1);
        textInfo2 = (TextView)findViewById(R.id.info2);

        btnOn.setOnClickListener(btnOnOffClickListener);
        btnOff.setOnClickListener(btnOnOffClickListener);
    }

    View.OnClickListener btnOnOffClickListener = new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            String onoff;
            if(v==btnOn){
                onoff="/on";
            }else{
                onoff="/off";
            }

            btnOn.setEnabled(false);
            btnOff.setEnabled(false);

            String serverIP = editIp.getText().toString()+ onoff;

            TaskEsp taskEsp = new TaskEsp(serverIP);
            taskEsp.execute();

        }
    };

    private class TaskEsp extends AsyncTask<Void, Void, String> {

        String server;

        TaskEsp(String server){
            this.server = server;
        }

        @Override
        protected String doInBackground(Void... params) {

            final String p = "http://"+server;

            runOnUiThread(new Runnable(){
                @Override
                public void run() {
                    textInfo1.setText(p);
                }
            });

            String serverResponse = "";
            HttpClient httpclient = new DefaultHttpClient();
            try {
                HttpGet httpGet = new HttpGet();
                httpGet.setURI(new URI(p));
                HttpResponse httpResponse = httpclient.execute(httpGet);

                InputStream inputStream = null;
                inputStream = httpResponse.getEntity().getContent();
                BufferedReader bufferedReader =
                        new BufferedReader(new InputStreamReader(inputStream));
                serverResponse = bufferedReader.readLine();

                inputStream.close();
            } catch (URISyntaxException e) {
                e.printStackTrace();
                serverResponse = e.getMessage();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                serverResponse = e.getMessage();
            } catch (IOException e) {
                e.printStackTrace();
                serverResponse = e.getMessage();
            }

            return serverResponse;
        }

        @Override
        protected void onPostExecute(String s) {
            textInfo2.setText(s);
            btnOn.setEnabled(true);
            btnOff.setEnabled(true);
        }
    }
}


layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:padding="16dp"
    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" />

    <EditText
        android:id="@+id/ip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="192.168.43.103" />

    <Button
        android:id="@+id/bon"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="LED ON" />

    <Button
        android:id="@+id/boff"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="LED OFF" />

    <TextView
        android:id="@+id/info1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textStyle="italic" />

    <TextView
        android:id="@+id/info2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textStyle="bold" />
</LinearLayout>


uses-permission of "android.permission.INTERNET" is needed in AndroidManifest.xml.

Apache HTTP Client Removed from Android 6.0 release. To keep using org.apache.http.client, we have to add the code useLibrary 'org.apache.http.legacy' to build.gradle file.
apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.blogspot.android_er.androidespwebled"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    useLibrary 'org.apache.http.legacy'
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
}


download filesDownload the files (Android Studio Format) .

ESP8266/ESP-12 code, refer "Arduino-er: Standalone ESP8266/ESP-12: web control on-board LED".

Next:
Android App to control Standalone ESP8266/ESP-12 on-board LED, using HttpURLConnection.

2 comments:

Free Share with Pleasure! said...

Hi, I know this studid question. Im newbie in websocket for android. I want to ask about should i define/replaced the string of http become my ip?

eg:
final String p = "http://"+server;

become
final String p = "http://192.168.43.1"+server;

I still failed to connect to my esp8266_v12, and still geting confused to implement your arduino ESP8266 code. :)

Thanks in advance




Andr.oid Eric said...

hello Free Share with Pleasure,

I don't know websocket also, in my understanding websocket is a technique in web/html...

In this example, this use enter IP address in EditText, pass to TaskEsp() as serverIP. So p = "http://"+server is OK.

If you sure you know the IP, you can hard code as p = "http://192.168.43.1";