public abstract class ParentActivity extends Activity {public static final String ACTION_1 = "com.example.action1";public static final String ACTION_2 = "com.example.action2";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(ACTION_1);intentFilter.addAction(ACTION_2);registerReceiver(receiver, intentFilter);}protected abstract void doAction1();protected abstract void doAction2(String arg);BroadcastReceiver receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals(ACTION_1)) {doAction1();} else if (action.equals(ACTION_2)) {String arg = intent.getStringExtra("arg");doAction2(arg);}}};@Overrideprotected void onDestroy() {unregisterReceiver(receiver);super.onDestroy();};}

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