Android--广播接收者（发送有序广播）

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1、运行效果图

当点击发送求救广播按钮时

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创建步骤如下

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1、在layout布局中：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"android:background="@drawable/stitch_one"    tools:context="cn.edu.bzu.orderedbroadcast.MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:onClick="send"        android:layout_marginTop="50dp"        android:text="发送求救广播"        android:paddingLeft="5dp"        android:paddingRight="5dp"        android:background="#FFD202"        android:textSize="20sp"        /></RelativeLayout>

1、在MainActivity中：

package cn.edu.bzu.orderedbroadcast;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public  void send(View view){        Intent intent=new Intent();        //定义广播事件类型        intent.setAction("Intercept_Stitch");        //发送广播       sendOrderedBroadcast(intent,null);    }}

2、在MyBroadcastReciveOne

package cn.edu.bzu.orderedbroadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class MyBroadcastReceiverOne extends BroadcastReceiver {    public MyBroadcastReceiverOne() {    }    @Override    public void onReceive(Context context, Intent intent) {        Log.i("MyBroadcastReceiverOne","自定义的广播接收者one，接受到了广播事件");    }}

2、在MyBroadcastReciveTwo

package cn.edu.bzu.orderedbroadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class MyBroadcastReceiverTwo extends BroadcastReceiver {    public MyBroadcastReceiverTwo() {    }    @Override    public void onReceive(Context context, Intent intent) {        Log.i("MyBroadcastReceiverTwo","自定义的广播接收者Two，接受到了广播事件");        abortBroadcast();        Log.i("MyBroadcastReceiverTwo","我是广播接收者Two我的拦截被终止了");    }}

3、在MyBroadcastReciveThree

package cn.edu.bzu.orderedbroadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class MyBroadcastReceiverThree extends BroadcastReceiver {    public MyBroadcastReceiverThree() {    }    @Override    public void onReceive(Context context, Intent intent) {        Log.i("MyBroadcastReceiverThree","自定义的广播接收者Three，接受到了广播事件");    }}

4、重要：在配置文件中

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.edu.bzu.orderedbroadcast">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <receiver        android:name=".MyBroadcastReceiverOne">        <intent-filter android:priority="1000">            <action android:name="Intercept_Stitch"/>        </intent-filter>    </receiver>        <receiver            android:name=".MyBroadcastReceiverTwo">            <intent-filter android:priority="200">                <action android:name="Intercept_Stitch"/>            </intent-filter>        </receiver>        <receiver            android:name=".MyBroadcastReceiverThree">            <intent-filter android:priority="600">                <action android:name="Intercept_Stitch"/>            </intent-filter>        </receiver>    </application></manifest>

注意：

<intent-filter android:priority="600">                <action android:name="Intercept_Stitch"/>            </intent-filter>

1. 优先级的概念用于描述控件的 intent的filter的类型。 这个属性只对activity 和 receivers 是有意义的。
2. 隐式调用activity的情况下： 如果多个activity 满足响应 的条件， 系统只会触发 priority 高的那个activity。
3. 有序广播发出的情况下：如果多个receiver满足响应的条件，系统会优先触发prioriyt搞的那个receiver。
4. priority 必须是整数，默认是0 范围是[-1000, 1000]
5. 有序广播，即从优先级别最高的广播接收器开始接收，接收完了如果没有丢弃，就下传给下一个次高优先级别的广播接收器进行处理，依次类推，直到最后。如果多个应用程序设置的优先级别相同，则谁先注册的广播，谁就可以优先接收到广播。