package com.android.testapplication;import java.text.SimpleDateFormat;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.widget.ImageView;import android.widget.ImageView.ScaleType;public class HandlerActivity extends Activity { private ImageView iv; private Handler han = new Handler(); private int[] images = {R.drawable.a0, R.drawable.a1, R.drawable.b1, R.drawable.b2}; private int index = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); iv = new ImageView(this); iv.setImageResource(R.drawable.ic_launcher); iv.setAdjustViewBounds(true); iv.setScaleType(ScaleType.CENTER); setContentView(iv); new Thread(new Runnable() { @Override public void run() { han.post(new Runnable() { @Override public void run() { index++; index = index % 4; Log.e("HandlerActivity", new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss") .format(new java.util.Date())); iv.setImageResource(images[index]); han.postDelayed(this, 1000); } }); } }).start(); }}