Android 按返回键经过广播刷新数据_Android

Android 按返回键通过广播刷新数据

案例：有两个Activity，第一个Activity中有一个按钮，这个按钮的Text是pca，点击之后跳到定外的Activity，在定外一个Activity中发送广播，改变第一个Activity中按钮Text的值，变成chy。下面请看代码：

1.自定义广播接收者

private class MBroadcastReceiver extends BroadcastReceiver{		@Override		public void onReceive(Context context, Intent intent) {			userName = "chy";			bt1.setText(userName);		}			}

2.注册广播

广播的Action

public static final String USER_BROD_ACTION = "user.broadcast.action";

注册广播：

MBroadcastReceiver receiver;receiver = new MBroadcastReceiver();IntentFilter filter = new IntentFilter(Constants.USER_BROD_ACTION);registerReceiver(receiver, filter);

3.记的要在Activity销毁的时候解除广播的注册

@Overrideprotected void onDestroy() {	// TODO Auto-generated method stub	super.onDestroy();	unregisterReceiver(receiver);}

4.发送广播

Intent intent = new Intent(Constants.USER_BROD_ACTION);sendBroadcast(intent);