touch events on images in grid android

Question

heres the code iused to make grid view..how to add click vents on images so dat image can be flip.pllzzzzzz helpppp

public class GameScreen extends View {
       private static final String TAG = "Touchimage";
 private Game game;

 public GameScreen(Context context) {
  super(context);

  this.game = (Game) context;
  setFocusable(true);
  setFocusableInTouchMode(true);
 }

 public GameScreen(Context context, AttributeSet attrs) {
  super(context, attrs);
  // TODO Auto-generated constructor stub
 }

 public GameScreen(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  // TODO Auto-generated constructor stub
 }

 private float width; // width of one tile
 private float height; // height of one tile
 private int selX; // X index of selection
 private int selY; // Y index of selection
 private final Rect selRect = new Rect();

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
 width = w / 4f;
 height = h / 4f;
 getRect(selX, selY, selRect);
 Log.d(TAG, "onSizeChanged: width " + width + ", height "
 + height);
 super.onSizeChanged(w, h, oldw, oldh);
 }

 private void getRect(int x, int y, Rect rect) {
  rect.set((int) (x * width), (int) (y * height), (int) (x
  * width + width), (int) (y * height + height));
  }

 @Override
 protected void onDraw(Canvas canvas) {
  Paint background = new Paint();
  background.setColor(getResources().getColor(
  R.color.puzzle_background));
  canvas.drawRect(0, 0, getWidth(), getHeight(), background);
  Paint dark = new Paint();
  dark.setColor(getResources().getColor(R.color.puzzle_dark));
  for (int i = 0; i<4; i++) {

   canvas.drawLine(0, i * height, getWidth(), i * height,
   dark);
   canvas.drawLine(0, i * height + 1, getWidth(), i * height
   + 1, dark);
   canvas.drawLine(i * width, 0, i * width, getHeight(), dark);
   canvas.drawLine(i * width + 1, 0, i * width + 1,
   getHeight(), dark);
   }
  Paint foreground = new Paint(Paint.ANTI_ALIAS_FLAG);
  FontMetrics fm = foreground.getFontMetrics();
  // Centering in X: use alignment (and X at midpoint)
  float x = width / 2;
  // Centering in Y: measure ascent/descent first
  float y = height / 2- (fm.ascent + fm.descent) / 2;
  Bitmap _scratch =  BitmapFactory.decodeResource(getResources(), R.drawable.icon);

        //ImageView img= new ImageView(Tutorial2D.this);
        //img.setImageBitmap(_scratch);
        //canvas.drawColor(Color.BLACK);
  for (int i = 0; i<4; i++) {
   for (int j = 0; j<4; j++) {
    canvas.drawBitmap(_scratch, i
   * width+x/2 , j * height+y/2 , foreground);
   }
   }

        //canvas.drawBitmap(_scratch, 0, 0, null);
  super.onDraw(canvas);
 }

}