touch event in custom view (android)

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public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); CustomView cv = new CustomView(this); cv.setBackgroundColor(Color.GRAY); setContentView(cv); } } class CustomView extends View { private Paint paint; private int positionX; private int positionY; private String l = ""; public CustomView(Context context) { super(context); paint = new Paint(); paint.setColor(Color.WHITE); paint.setTextSize(18); paint.setAntiAlias(true); } protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); canvas.drawText(l, 10, 100, paint); invalidate(); } public boolean onTouchEvent(MotionEvent event) { positionX = (int)event.getRawX(); positionY = (int)event.getRawY(); switch(event.getAction()) { case MotionEvent.ACTION_DOWN: l = "DOWN - " + String.valueOf(positionX) + " " + String.valueOf(positionY); break; case MotionEvent.ACTION_MOVE: l = "MOVE - " + String.valueOf(positionX) + " " + String.valueOf(positionY); break; case MotionEvent.ACTION_UP: l = "UP - " + String.valueOf(positionX) + " " + String.valueOf(positionY); break; } return true; } }