public class HandlerTest extends Activity {

     int[] images = new int[] {

             R.drawable.baiyang, R.drawable.jinniu, R.drawable.shuangyu

     };

     int currentImageID = 0;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.imageview);

         final ImageView imageView = (ImageView) findViewById(R.id.imageViewtest);

         final Handler myHandler = new Handler() {

             @Override

             public void handleMessage(Message msg) {

                 if (msg.what == 0x123) {

                     imageView.setBackgroundResource(images[currentImageID++ % images.length]);

                 }

             }

         };

         new Timer().schedule(new TimerTask() {

             @Override

             public void run() {

                 myHandler.sendEmptyMessage(0x123);

             }

         }, 0, 1000);

     }

 }