android有序广播

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）

<?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>

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);
			}
		});
        
    }
}

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();
	}

}

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"));
	}

}