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);
		}
		
	}

广播的Action

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

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

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

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

Android 按返回键通过广播刷新数据

原文：http://blog.csdn.net/pcaxb/article/details/47751947