有序广播

16lz 2021-01-23

住：需要在mainfast中通配置权限并使用权限

<permission android:protectionLevel="normal" android:name="broadcastyouxupro"></permission>
<uses-permission android:name="broadcastyouxupro"/>

Intent intent=new Intent();
intent.setAction("broadcast_youxu");
sendOrderedBroadcast(intent, "broadcastyouxupro");

android有序广播

博客分类：

android

普通广播（Normal Broadcast）：

一，优缺点：和有序广播的优缺点相反！

二，发送广播的方法：sendBroadcast()

有序广播（Ordered Broadcast）：

一，优缺点

优点：1，按优先级的不同，优先Receiver可对数据进行处理，并传给下一个Receiver

2，通过abortBroadcast可终止广播的传播

缺点：效率低

二，发送广播的方法：sendOrderedBroadcast()

三，优先接收到Broadcast的Receiver可通过setResultExtras(Bundle)方法将处理结果存入Broadcast中，

下一个Receiver 通过 Bundle bundle=getResultExtras(true)方法获取上一个Receiver传来的数据

程序效果：点击按钮，两个Receiver接收同一条广播，在logcat中打印出数据（按照Receiver的优先顺序，Receiver2先，Receiver1后）

Java代码

<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="com.song"
android:versionCode="1"
android:versionName="1.0">
<uses-sdkandroid:minSdkVersion="8"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name">
<activity
android:label="@string/app_name"
android:name=".C48_BroadcastActivity">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiverandroid:name=".MyReceiver1">
<intent-filterandroid:priority="200">
<actionandroid:name="com.song.123"/>
</intent-filter>
</receiver>
<receiverandroid:name=".MyReceiver2">
<intent-filterandroid:priority="1000">
<actionandroid:name="com.song.123"/>
</intent-filter>
</receiver>
</application>
</manifest>

Java代码

packagecom.song;
//发送广播，bundle绑上key为a的数据
importandroid.app.Activity;
importandroid.content.Intent;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
publicclassC48_BroadcastActivityextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
Buttonbutton;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button=(Button)findViewById(R.id.button);
button.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
Intentintent=newIntent("com.song.123");
Bundlebundle=newBundle();
bundle.putString("a","aaa");
intent.putExtras(bundle);
//有序广播
sendOrderedBroadcast(intent,null);
}
});
}
}

Java代码

packagecom.song;
//优先接到广播，bundle绑上key为b的数据
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.os.Bundle;
publicclassMyReceiver2extendsBroadcastReceiver{
@Override
publicvoidonReceive(Contextcontext,Intentintent){
//TODOAuto-generatedmethodstub
System.out.println("receiver2");
//context.getSystemService(name);
Bundlebundle=intent.getExtras();
bundle.putString("b","bbb");
System.out.println("a="+bundle.get("a"));
setResultExtras(bundle);
//切断广播
//abortBroadcast();
}
}

Java代码

packagecom.song;
//接收从receiver2传来的广播，包含key为a和b的数据
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.os.Bundle;
publicclassMyReceiver1extendsBroadcastReceiver{
@Override
publicvoidonReceive(Contextcontext,Intentintent){
//TODOAuto-generatedmethodstub
System.out.println("receiver1");
//要不要接受上一个广播接收器receiver2传来的的数据
Bundlebundle=getResultExtras(true);
System.out.println("a="+bundle.getString("a")+",b="+bundle.getString("b"));
}
}

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