android studio BroadcastReceiver基础

最简单形式：

manifest：

<receiver    android:name=".MyReceiver"    android:enabled="true"    android:exported="false"></receiver>

mainactivity：

case R.id.btn:    sendBroadcast(new Intent(this,MyReceiver.class));    break;

myreceiver:

 @Override    public void onReceive(Context context, Intent intent) {        // TODO: This method is called when the BroadcastReceiver is receiving        // an Intent broadcast.//        throw new UnsupportedOperationException("Not yet implemented");        System.out.println("receive new msg");    }

在activity中控制receiver的创建和销毁：

首先在manifest中注释掉receiver。

在receiver中定义：

public static final String ACTION="com.example.jowang.learnbroadcastreceiver.intent.action.MyReceiver";

mainactivity:

@Overridepublic void onClick(View view) {    switch (view.getId()){        case R.id.btn:            sendBroadcast(new Intent(MyReceiver.ACTION));//隐式intent            break;        case R.id.btnreg:            if (receiver==null){                receiver=new MyReceiver();                registerReceiver(receiver,new IntentFilter(MyReceiver.ACTION));            }            break;        case R.id.btncan:            if (receiver!=null){                unregisterReceiver(receiver);                receiver=null;            }            break;    }}private MyReceiver receiver=null;
优先级 在intentfilter中设置priority数值越大，优先级越高

阻止信息继续传递：activity中：sendorderedbroadcast(intent,null)

receiver的onreceive中：abortbroadcast();