public class MainActivity extends AppCompatActivity {
   private TextView mTextView;
   private Handler mHandler = new Handler();
   private ImageView mImageView;
   private int index = 0;
   private MyRunnable  myRunnable = new MyRunnable();
   private int[] id = {R.drawable.hehe1,R.drawable.hehe2,R.drawable.hehe3};

   public class MyRunnable implements Runnable{

       @Override
       public void run() {
           index++;
           index = index%3;
           mImageView.setImageResource(id[index]);
           mHandler.postDelayed(myRunnable,2000);


       }
   }


   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       mTextView = (TextView) findViewById(R.id.tv_show);
       mImageView = (ImageView) findViewById(R.id.iv_show);


       mHandler.postDelayed(myRunnable,2000);
       
   }
}