Android tutorial - Broadcastreceiver in android | Android Call State BroadCastReceiver - android app development - android studio - android development tutorial



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what is BroadCastReceiver?

  • A broadcast receiver (receiver) is an Android component which allows you to register for system or application events.
  • All registered receivers for an event are notified by the Android runtime once this event happens.
  • For example, applications can register for the ACTION_BOOT_COMPLETED system event which is fired once the Android system has completed the boot process.
 android broadcast receiver process

activity_main.xml

  • File: activity_main.xml
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<RelativeLayout xmlns:androclass="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=".MainActivity" >  	
  	
    <TextView  	
        android:layout_width="wrap_content"  	
        android:layout_height="wrap_content"  	
        android:text="@string/hello_world" />  	
  	
</RelativeLayout>  	
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Activity class

  • File: MainActivity.java
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package com.example.callstatebroadcastreceiver;  
  
import android.os.Bundle;  
import android.app.Activity;  
import android.view.Menu;  
  
public class MainActivity extends Activity {  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
    }  
  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
      
}  
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IncommingCallReceiver

  • File: IncommingCallReceiver.java
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package com.example.callstatebroadcastreceiver;  	
  	
import android.content.BroadcastReceiver;  	
import android.content.Context;  	
import android.content.Intent;  	
import android.telephony.TelephonyManager;  	
import android.widget.Toast;  	
  	
  	
 public class IncommingCallReceiver extends BroadcastReceiver{  	
      Context context;  	
         	
      @Override  	
      public void onReceive(Context context, Intent intent){  	
          try{  	
           String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);  	
  	
              if(state.equals(TelephonyManager.EXTRA_STATE_RINGING)){  	
                   Toast.makeText(context, "Phone Is Ringing", Toast.LENGTH_LONG).show();  	
              }  	
                	
              if(state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){  	
                   Toast.makeText(context, "Call Recieved", Toast.LENGTH_LONG).show();  	
              }  	
                	
              if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)){  	
                   Toast.makeText(context, "Phone Is Idle", Toast.LENGTH_LONG).show();  	
              }  	
          }  	
          catch(Exception e){e.printStackTrace();}  	
      }  	
        	
}  	
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