Handler

public class MainActivity extends Activity
{
// 定义周期性显示的图片的ID
int[] imageIds = new int[]
{
R.drawable.java,
R.drawable.javaee,
R.drawable.ajax,
R.drawable.android,
R.drawable.swift
};
int currentImageId = 0;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ImageView show = (ImageView) findViewById(R.id.show);
final Handler myHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
// 如果该消息是本程序所发送的
if (msg.what == 0x1233)
{
// 动态地修改所显示的图片
show.setImageResource(imageIds[currentImageId++
% imageIds.length]);
}
}
};
// 定义一个计时器，让该计时器周期性地执行指定任务
new Timer().schedule(new TimerTask()
{
@Override
public void run()
{
// 发送空消息
myHandler.sendEmptyMessage(0x1233);
}
}, 0, 1200);

//        new Thread(new Runnable()
//        {
//            @Override
//            public void run()
//            {
//                //do something
//            }
//        }).start();
}
}