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  • Android BroadcastReceiver

            <receiver
                android:name=".MyReceiver"
                android:enabled="true"
                android:exported="true">
                <!--<intent-filter android:priority="11">-->
                <intent-filter >
                    <action android:name="com.grandkai.learnbroadcastreceiver.intent.action.MyReceiver" />
                </intent-filter>
    
            </receiver>
    
            <receiver
                android:name=".MyReceiver2"
                android:enabled="true"
                android:exported="true">
                <!--<intent-filter android:priority="10">-->
                <intent-filter >
                    <action android:name="com.grandkai.learnbroadcastreceiver.intent.action.MyReceiver" />
                </intent-filter>
            </receiver>
    
    不指定优先级的情况下,先注册的BroadcastReceiver先执行,不想继续向下执行其他BroadcastReceiver需要在onReceive中执行abortBroadcast();同时启动广播时需要发送有序广播sendOrderedBroadcast(..);
    
     @Override
        public void onClick(View view) {
            switch (view.getId()) {
                case R.id.button:
                    Intent intent = new Intent(ACTION);
    //                Intent intent = new Intent(MainActivity.this, MyReceiver.class);
                    intent.putExtra("data","111");
                    sendOrderedBroadcast(intent, null);
                    break;
                case R.id.btnReg:
                    if (myReceiver == null) {
                        System.out.println("注册服务");
                        myReceiver = new MyReceiver();
                        registerReceiver(myReceiver , new IntentFilter(ACTION));
                    }
                    break;
                case R.id.btnUnreg:
                    if (myReceiver != null) {
                        System.out.println("注销服务");
                        unregisterReceiver(myReceiver);
                    }
                    break;
    
            }
        }
        private MyReceiver myReceiver = null;
    

      

    BroadcastReceiver所对应的广播分两类:普通广播和有序广播。

    (1)普通广播所有的receivers接收器的执行顺序不确定。    因此,所有的receivers接收器接收broadcast的顺序不确定。

    (2)有序广播通过在intent-filter中设置android:priority属性来设置receiver的优先级。优先级相同的receiver其执行顺序不确定。代码中注册的话,且其intent-filter拥有相同android:priority属性的话,先注册的将先收到广播。

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  • 原文地址:https://www.cnblogs.com/sallet/p/5798617.html
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