使用Handler和Timer+Timertask实现简单的图片轮播

  布局文件就只放了一个简单的ImageView，就不展示了。

  下面是Activity

package com.example.administrator.handlerthreadmessagedemo;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Timer;


public class MainActivity extends Activity  {

    private int images[] = new int[]{R.drawable.image1,R.drawable.image2,R.drawable.image3};  //存放图片

    private ImageView imageView;
    private int index = 0;   //计算
    private TextView textView;
    private Timer timer = new Timer();
    private Timertask timertask;



    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.imageView);
        textView = (TextView) findViewById(R.id.title);
        timertask = new Timertask();   //放回到Timer中
        timer.schedule(timertask,0,1000);  //使用Timer 每隔1秒发送一次空消息
    }

    private Handler  mhandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if(msg.what == 0x111){
                index++;
                imageView.setBackgroundResource(images[index % 3]);
            }
        }
    };

    class Timertask extends java.util.TimerTask{

        @Override
        public void run() {
            mhandler.sendEmptyMessage(0x111);
        }
    }

}