Broadcast Receiver Demo

1 ) Main Activity

public class MainActivity extends AppCompatActivity implements TextToSpeech.OnInitListener
{
    public TextToSpeech tts;
    @Override    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        registerReceiver(broadcastReceiver, new IntentFilter("broadCastName"));
        tts=new TextToSpeech(this,this);
    }

    @Override    public void onInit(int status)
    {
    }

    PhoneStateReceiver broadcastReceiver =  new PhoneStateReceiver()
    {
        @Override        public void onReceive(Context context, Intent intent)
        {

            Bundle b = intent.getExtras();
            String message = b.getString("message");
            tts.speak(message+"Calling",TextToSpeech.QUEUE_FLUSH,null);

        }
    };
}

2 ) Broadcast Receiver

public class PhoneStateReceiver extends BroadcastReceiver {
    @Override    public void onReceive(Context context, Intent intent) {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
            try {
                if(state.equals(TelephonyManager.EXTRA_STATE_RINGING)){
                    Toast.makeText(context,"Ringing State Number is -"+incomingNumber,Toast.LENGTH_SHORT).show();
                     TextToSpeech tts = null;
                    tts.speak(incomingNumber+"Calling",TextToSpeech.QUEUE_FLUSH,null);
                }
                if ((state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK))){
                    Toast.makeText(context,"Received State",Toast.LENGTH_SHORT).show();
                }
                if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)){
                    Toast.makeText(context,"Idle State",Toast.LENGTH_SHORT).show();
                }
            }
            catch (Exception e){
                e.printStackTrace();
            }

        Bundle extras = intent.getExtras();
        Intent i = new Intent("broadCastName");
        // Data you need to pass to activity        i.putExtra("message", extras.getString(incomingNumber));

        context.sendBroadcast(i);

    }
}


Notes :

1 ) Require Graddle

compile 'com.android.support:appcompat-v7:25.1.1'
compile 'com.android.support:design:25.1.1'
compile 'com.android.support:support-v4:25.1.1'