android背景图片更换——经典例子

package

com.smart.image;

import

android.app.Activity;

import

android.app.AlarmManager;

import

android.app.PendingIntent;

import

android.content.Context;

import

android.content.Intent;

import

android.os.Bundle;

import

android.view.View;

import

android.view.View.OnClickListener;

import

android.widget.Button;

public

class

Main

extends

Activity

implements

OnClickListener{

private

ButtonstartImage;

private

ButtonstopImage;

@Override

public

void

onCreate(BundlesavedInstanceState){

super

.onCreate(savedInstanceState);

setContentView(R.layout.main);

startImage=(Button)findViewById(R.id.statrImage);

stopImage=(Button)findViewById(R.id.stopImage);

stopImage.setEnabled(

false

);

//刚开始显示为false

startImage.setOnClickListener(

this

);

//绑定器

stopImage.setOnClickListener(

this

);

}

@Override

public

void

onClick(Viewv){

//获得服务

AlarmManageralarmManager=(AlarmManager)getSystemService(Context.ALARM_SERVICE);

//启动

PendingIntentpendingIntent=PendingIntent.getService(

this

,

0

,

new

Intent(

this

,ChangeBackground.

class

),

0

);

switch

(v.getId())

{

//按钮事件开始更换背景图片

case

R.id.statrImage:

alarmManager.setRepeating(AlarmManager.RTC,

0

,

5000

,

pendingIntent);

startImage.setEnabled(

false

);

stopImage.setEnabled(

true

);

break

;

//按钮事件停止图片更换

case

R.id.stopImage:

alarmManager.cancel(pendingIntent);

startImage.setEnabled(

true

);

stopImage.setEnabled(

false

);

break

;

}

}

}