Android BroadcastReceiver edit

Example of a LocalBroadcastManager

A BroadcastReceiver is basically a mechanism to relay Intents through the OS to perform specific actions. A classic definition being

“A Broadcast receiver is an Android component which allows you to register for system or application events.”

LocalBroadcastManager is a way to send or receive broadcasts within an application process. This mechanism has a lot of advantages

  1. since the data remains inside the application process, the data cannot be leaked.
  2. LocalBroadcasts are resolved faster, since the resolution of a normal broadcast happens at runtime throughout the OS.

A simple example of a LocalBroastManager is:

SenderActivity

Intent intent = new Intent("anEvent");
intent.putExtra("key", "This is an event");
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

ReceiverActivity

  1. Register a receiver
``` LocalBroadcastManager.getInstance(this).registerReceiver(aLBReceiver, new IntentFilter(“anEvent”));
2. A concrete object for performing action when the receiver is called

> ```
private BroadcastReceiver aLBReceiver = new BroadcastReceiver() {
    @Override 
    public void onReceive(Context context, Intent intent) {
        // perform action here.
    } 
};
  1. unregister when the view is not visible any longer.
@Override protected void onPause() { // Unregister since the activity is about to be closed. LocalBroadcastManager.getInstance(this).unregisterReceiver(aLBReceiver); super.onDestroy(); }

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