android-BroadcastReceiver 发送有序广播

普通广播（Normal Broadcast）：

一，可以在同一时刻被所有接收者收到，消息传递效率比较高，但缺点是接收者不能将结果传递给下一个接收者，且无法终止Broadcast Intent的传播
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

AndroidManifest.xml

      <?xml version="1.0" encoding="utf-8"?>  <manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.song"      android:versionCode="1"      android:versionName="1.0" >      <uses-sdk android: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 >                  <action android:name="android.intent.action.MAIN" />                  <category android:name="android.intent.category.LAUNCHER" />              </intent-filter>              <!--优先级的设定 MyReceiver2大于MyReceiver1，优先级的范围-1000~1000 -->          </activity>          <receiver android:name=".MyReceiver1">              <intent-filter android:priority="200">                  <action android:name="com.song.123"/>              </intent-filter>          </receiver>          <receiver android:name=".MyReceiver2">              <intent-filter android:priority="1000">                  <action android:name="com.song.123"/>              </intent-filter>          </receiver>      </application>  </manifest>  

主Activity

package com.song;  //发送广播，bundle绑上key为a的数据  import android.app.Activity;  import android.content.Intent;  import android.os.Bundle;  import android.view.View;  import android.view.View.OnClickListener;  import android.widget.Button;  public class C48_BroadcastActivity extends Activity {      /** Called when the activity is first created. */      Button button;      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);          button=(Button)findViewById(R.id.button);          button.setOnClickListener(new OnClickListener() {              @Override              public void onClick(View v) {                  // TODO Auto-generated method stub                  Intent intent=new Intent("com.song.123");                  Bundle bundle=new Bundle();                  bundle.putString("a", "aaa");                  intent.putExtras(bundle);                  //有序广播                  sendOrderedBroadcast(intent, null);              }          });      }  }  

Receiver1

package com.song;  //接收从receiver2传来的广播，包含key为a和b的数据  import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;  import android.os.Bundle;  public class MyReceiver1 extends BroadcastReceiver{      @Override      public void onReceive(Context context, Intent intent) {          // TODO Auto-generated method stub          System.out.println("receiver1");          //要不要接受上一个广播接收器receiver2传来的的数据          Bundle bundle=getResultExtras(true);          System.out.println("a="+bundle.getString("a")+",b="+bundle.getString("b"));      }  }  

Receiver2

package com.song;  //优先接到广播，bundle绑上key为b的数据  import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;  import android.os.Bundle;  public class MyReceiver2 extends BroadcastReceiver{      @Override      public void onReceive(Context context, Intent intent) {          // TODO Auto-generated method stub          System.out.println("receiver2");  //      context.getSystemService(name);          Bundle bundle=intent.getExtras();          bundle.putString("b", "bbb");          System.out.println("a="+bundle.get("a"));          setResultExtras(bundle);          //切断广播  //      abortBroadcast();      }  }  

程序效果