Android programming - Activate loudspeaker for outgoing call

In this post, I'm sharing with you the Android code to activate automatically the loudspeaker when making a call in a programatically way .

The idea behind is to place a call and to listen to the phone state change to switch on the speaker when the call is established.

package com.danielthat.loudspeaker;

import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class Loudspeaker extends Activity {
 
 Button mButton;
 EditText mEdit;
 TelephonyManager manager;
 StatePhoneReceiver myPhoneStateListener;
 boolean callFromApp=false; // To control the call has been made from the application
 boolean callFromOffHook=false; // To control the change to idle state is from the app call

 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.layout_loudspeaker);
  
  //To be notified of changes of the phone state create an instance 
  //of the TelephonyManager class and the StatePhoneReceiver class
  myPhoneStateListener = new StatePhoneReceiver(this);
  manager = ((TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE));
  
  mEdit   = (EditText)findViewById(R.id.editText1);
        
  mButton = (Button) findViewById(R.id.button1);
  mButton.setOnClickListener(new View.OnClickListener() {
   
   public void onClick(View v) {
    
    String phoneNumber = mEdit.getText().toString(); 
    manager.listen(myPhoneStateListener,
    PhoneStateListener.LISTEN_CALL_STATE); // start listening to the phone changes
    callFromApp=true;
    Intent i = new Intent(android.content.Intent.ACTION_CALL, 
                          Uri.parse("tel:+" + phoneNumber)); // Make the call        
    startActivity(i);    
   }  
  });  
 }

 
 // Monitor for changes to the state of the phone
 public class StatePhoneReceiver extends PhoneStateListener {
     Context context;
     public StatePhoneReceiver(Context context) {
         this.context = context;
     }

     @Override
     public void onCallStateChanged(int state, String incomingNumber) {
         super.onCallStateChanged(state, incomingNumber);
         
         switch (state) {
         
         case TelephonyManager.CALL_STATE_OFFHOOK: //Call is established
          if (callFromApp) {
              callFromApp=false;
              callFromOffHook=true;
                    
              try {
                Thread.sleep(500); // Delay 0,5 seconds to handle better turning on loudspeaker
              } catch (InterruptedException e) {
              }
           
              //Activate loudspeaker
              AudioManager audioManager = (AudioManager) 
                                          getSystemService(Context.AUDIO_SERVICE);
              audioManager.setMode(AudioManager.MODE_IN_CALL);
              audioManager.setSpeakerphoneOn(true);
           }
           break;
         
        case TelephonyManager.CALL_STATE_IDLE: //Call is finished
          if (callFromOffHook) {
                callFromOffHook=false;
                AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                audioManager.setMode(AudioManager.MODE_NORMAL); //Deactivate loudspeaker
                manager.listen(myPhoneStateListener, // Remove listener
                      PhoneStateListener.LISTEN_NONE);
             }
          break;
         }
     }
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.danielthat.loudspeaker"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.danielthat.loudspeaker.Loudspeaker"
            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>

<RelativeLayout 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"
    tools:context=".Loudspeaker" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Number to call with loudspeaker on:" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:ems="10"
        android:inputType="phone" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:text="Call" />

</RelativeLayout>