Android Broadcast(广播)简单样例

Android Broadcast(广播)使用

package com.broad;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

/**

 *  广播的使用

 * @author XP

 *

 */

public class BroadCastUse extends Activity {

    /** Called when the activity is first created. */

private Button button;

//定义广播动作

private static final String BROADCASE_ID = "broadcase";

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        button = (Button)findViewById(R.id.buttonBC);

        button.setOnClickListener(btnClick);

    }

    @Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

//注册广播

regeditBroad();

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

//销毁广播

destoryBroad();

}

private OnClickListener btnClick = new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent = new Intent(BROADCASE_ID);

//发送广播

sendBroadcast(intent);

}

};

/**

* 注册广播

*/

private void regeditBroad(){

IntentFilter filter = new IntentFilter();

 //过滤定义广播动作

filter.addAction(BROADCASE_ID);

registerReceiver(broadcast, filter);

}

/**

* 销毁广播

*/

private void destoryBroad(){

if(broadcast != null){

unregisterReceiver(broadcast);

}

}

private BroadcastReceiver broadcast = new BroadcastReceiver() {

//接收广播，实现逻辑判断 

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

if(intent.getAction() == BROADCASE_ID){

Log.i("console", "onReceive");

}

}

};

}

 广播发送有三种形式,即,sendBroadcast(),sendOrderedBroadcast(),sendStickyBroadcast()

sendBroadcast()：普通广播 (Normal broadcasts) 
发送一个广播，所以监听该广播的广播接收者都可以监听到该广播。

sendOrderedBroadcast()：有序广播 (Ordered broadcasts) 
按照接收者的优先级顺序接收广播 , 优先级别在 intent-filter 中的 priority 中声明 ,-1000 到1000 之间 , 值越大 , 优先级越高 . 可以终止广播意图的继续传播 . 接收者可以篡改内容 .

 sendStickyBroadcast()：异步广播 
当处理完之后的Intent ，依然存在，这时候registerReceiver(BroadcastReceiver, IntentFilter) 还能收到他的值，直到你把它去掉 , 不能将处理结果传给下一个接收者 , 无法终止广播 .