广播——自定义广播和广播优先级_创建一个广播发送接收和拦截的应用程序优先级-优快云博客

本文详细介绍了Android中的广播机制，包括如何发送有序与无序广播、如何设置广播接收者的优先级，以及如何确保特定的广播接收者无论如何都能接收到广播。通过实例展示了不同优先级的广播接收者接收自定义广播事件的过程。

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转自http://www.cnblogs.com/zhongyinghe/p/5314971.html

1、发送广播代码

package com.example.alame;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void click(View view){
        Intent intent = new Intent();
        intent.setAction("com.exemple.oooxxx");
        //发送一条无序的广播；如果是无序的广播，则所有的广播接收者都能够接收到这个广播事件
        //sendBroadcast(intent);
        //如果广播是有序的发送出去，则广播接受者按优先级来接收广播事件；有序广播特点：高优先级的广播接收者可以终止掉广播事件
        //sendOrderedBroadcast(intent, null);
        //这种方式的FinalBroadcast广播接受者无论如何都会接收到广播
        sendOrderedBroadcast(intent, null, new FinalBroadcast(), null, 0, null, null);
    }
}

2、FinalBroadcast是无需在清单文件中进行配置的,并且无论如何都会接收到广播

package com.example.alame;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class FinalBroadcast extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
         System.out.println("我是最后接收者");
    }

}

3、测试接收自定义广播事件代码

1)清单文件

<receiver android:name=".MyBroadcastReceiver">
            <intent-filter android:priority="1000">
                <action android:name="com.exemple.oooxxx"/>
            </intent-filter>
        </receiver>
         <receiver android:name=".MyBroadcastReceiver2">
            <intent-filter android:priority="500">
                <action android:name="com.exemple.oooxxx"/>
            </intent-filter>
        </receiver>
         <receiver android:name=".MyBroadcastReceiver3">
            <intent-filter android:priority="100">
                <action android:name="com.exemple.oooxxx"/>
            </intent-filter>
        </receiver>

在清单文件中设置了优先级

2)广播接收者代码

package com.example.module3g;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("receriver 1");
        Toast.makeText(context, "接收到频道", 0).show();
        //该函数会终止掉广播，造成低优先级的广播接受者接收不到广播
        //abortBroadcast();
    }

}

package com.example.module3g;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyBroadcastReceiver2 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("receriver 2");
        Toast.makeText(context, "接收到频道2", 0).show();
    }

}

package com.example.module3g;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyBroadcastReceiver3 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("receriver 3");
        Toast.makeText(context, "接收到频道3", 0).show();
    }

}