广播实现的方式

1.

//实现广播接收器
private BroadcastReceiver mUserChangeReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        //具体代码
    }
};

//定义一个IntentFilter 
IntentFilter filter = new IntentFilter(ACTION_USERCHANGE);

//将IntentFilter与BroadcastReceiver关联起来
context.registerReceiver(receiver, filter);

2.