1、

int what = 0;
Thread thread = new Thread(new Runnable() {

public void run() {
while (true) {
handler.sendEmptyMessage((what++) % 4);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});

2、

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
imageView.setImageResource(R.drawable.p1);
break;
case 1:
imageView.setImageResource(R.drawable.p2);
break;
case 2:
imageView.setImageResource(R.drawable.p3);
break;
case 3:
imageView.setImageResource(R.drawable.p4);
break;
}
super.handleMessage(msg);
}
};

3、thread.start();

注：

private int imageIds[];

//图片ID        imageIds = new int[]{            R.drawable.a,                R.drawable.b,                R.drawable.c,                R.drawable.d,                R.drawable.e            };

imgView.setImageDrawable(sdk.getContext().getResources().getDrawable(array[i]));

模拟一个简单的相册查看器，每隔一段时间自动更换下一张照片。