Android - Make ImageView's transparent area not clickable

ImageView :

ImageView imgView= (ImageView) findViewById(R.id.color_blue);
imgView.setDrawingCacheEnabled(true);
imgView.setOnTouchListener(changeColorListener); 

OnTouchListener:

private final OnTouchListener changeColorListener = new OnTouchListener() {

  @Override
  public boolean onTouch(final View v, MotionEvent event) {

   Bitmap bmp = Bitmap.createBitmap(v.getDrawingCache());
   int color = 0;
   try {
    color = bmp.getPixel((int) event.getX(), (int) event.getY());
   } catch (Exception e) {
    // e.printStackTrace();
   }
   if (color == Color.TRANSPARENT)
    return false;
   else {

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
     //do something here
     break;
    case MotionEvent.ACTION_OUTSIDE:
     break;
    case MotionEvent.ACTION_CANCEL:
     break;
    case MotionEvent.ACTION_MOVE:
     break;
    case MotionEvent.ACTION_SCROLL:
     break;
    case MotionEvent.ACTION_UP:
     //do something here
     break;
    default:
     break;
    }
    return true;

   }
  }
 };