[Android] อยากทราบเกี่ยวกับ Translate animation ทำให้ ImageView เคลื่อนที่

public class Main extends Activity {  
     RelativeLayout layout;  
     ImageView imgLogo;  
     Animation anim;  
   
     public void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.main);  
         layout = (RelativeLayout)findViewById(R.id.layout);  
         imgLogo = (ImageView)findViewById(R.id.imgLogo);  
   
         Button btnNormalScale = (Button)findViewById(R.id.btnNormalScale);  
         btnNormalScale.setOnClickListener(new OnClickListener() {  
             public void onClick(View arg0) {  
                 anim = new TranslateAnimation(0, 100, 0, -200);  
                 anim.setDuration(1000);  
                 imgLogo.startAnimation(anim);  
             }  
         });  
} }