android 广播实现activity之间的通讯

使用广播实现activity之间的通讯，广播携带数据，目标activity动态注册广播接收器，处理数据，使用handle发送消息，通知主线程更新界面！

1、发送广播：

//发送广播，通知最新列表更新
Intent intent = new Intent();
intent.putExtra("username", username);
//Action：自己定义
intent.setAction(".....");
sendOrderedBroadcast(intent, null);

/**
* 广播接收
*/
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals("....")) {//<span style="font-family: 宋体;">"....":自己定义的action</span>
String username=intent.getStringExtra("username");
upMsgList(username);//更新数据列
mHandler.sendEmptyMessage(NEW_RECENT);
}
}
};

//注册广播
IntentFilter filter = new IntentFilter();
filter.addAction(".....");
getContext().registerReceiver(mReceiver, filter);

//处理
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case NEW_RECENT:
mAdapter.notifyDataSetChanged();//处理界面更新
break;
case NEW_NULL:
break;
default:
break;
}
}
};