自定義廣播和廣播優先級

1、發送廣播代碼

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");
        //發送一條無序的廣播；如果是無序的廣播，則所有的廣播接收者都能夠接收到這個廣播事件
        //sendBroadcast(intent);
        //如果廣播是有序的發送出去，則廣播接受者按優先級來接收廣播事件；有序廣播特點：高優先級的廣播接收者可以終止掉廣播事件
        //sendOrderedBroadcast(intent, null);
        //這種方式的FinalBroadcast廣播接受者無論如何都會接收到廣播
        sendOrderedBroadcast(intent, null, new FinalBroadcast(), null, 0, null, null);
    }
}

2、FinalBroadcast是無需在清單文件中進行配置的,並且無論如何都會接收到廣播

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、測試接收自定義廣播事件代碼

1)清單文件

 <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>

在清單文件中設置了優先級

2)廣播接收者代碼

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, "接收到頻道", 0).show();
        //該函數會終止掉廣播，造成低優先級的廣播接受者接收不到廣播
        //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, "接收到頻道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, "接收到頻道3", 0).show();
    }

}