Destroy BroadcastReceiver in onResume()

Question

I have onResume() and onDestroy() methods in my MainActivity. How can I detroy the registerReceiver in the onResume() method. I tried to assign it to variable but without success.

	@Override
	protected void onResume() {

		 registerReceiver(new BroadcastReceiver() {

			@Override
			public void onReceive(Context context, Intent intent) {
				check_wifi_available();

			}
		}, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
		super.onResume();

	}

	@Override
	protected void onDestroy() {
		unregisterReceiver();
		super.onDestroy();
	}

Answer 1

From the android documentation:

If registering a receiver in your Activity.onResume() implementation, you should unregister it in Activity.onPause(). (You won't receive intents when paused, and this will cut down on unnecessary system overhead)

Define your receiver as a class variable like this:

private BroadcastReceiver mReceiver = new BroadcastReceiver() { 
 @Override 
 public void onReceive(Context context, Intent intent) {
     check_wifi_available(); 
   } 
 } 

Then implements the onPause() / onResume() methods like this:

@Override 
protected void onResume() { 
     super.onResume(); 
     registerReceiver(mReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    unregisterReceiver(mReceiver);
 }  

No need to unregister it in onDestroy() method.