自定义广播和广播优先级

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();
    }

}