lesson 5 Programs communicate with each other-Broadcast-Receiver

How to communicate between mobile phone programs:
Broadcast-Receiver mechanism

Listening :
The broadcast receiver needs to be implemented as a subclass of the BroadcastReceiver class, and override the onReceive() method to receive messages with Intent objects as parameters
public class MyReceiver extends BroadcastReceiver {
   @Override
   public void onReceive(Context context, Intent intent) {
      Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();
   }
}

Register listener: AndroidManifest.xml
<application
   android:icon="@drawable/ ic_launcher"
   android:label="@string/app_name"
   android:theme="@style/AppTheme" >
   <receiver android:name="MyReceiver">

      <intent-filter>
         <action android:name="android. intent.action.BOOT_COMPLETED">
         </action>
      </intent-filter>

   </receiver>
</application>

Important System Events
android.intent.action.BATTERY_CHANGED Persistent broadcast containing battery state of charge, level and other information.
android.intent.action.BATTERY_LOW Identifies a low battery condition for the device.
android.intent.action.BATTERY_OKAY Indicates that the battery is now OK after being low.
android.intent.action.BOOT_COMPLETED is broadcast once after the system has finished booting.
android.intent.action.BUG_REPORT Displays the activity reporting bugs.
android.intent.action.CALL executes a call to someone specified by the data.
android.intent.action.CALL_BUTTON The user clicks the "call" button to open the dialer or other suitable interface for dialing.
android.intent.action.DATE_CHANGED Date changed.
android.intent.action.REBOOT Device reboot.


Send custom event:
public void broadcastIntent(View view)
{
   Intent intent = new Intent();
   intent.setAction("cn.uprogrammer.CUSTOM_INTENT");
   sendBroadcast(intent);
}