onSizeChanged method for the PianoView on the SSaurel's Channel

PianoView.java

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  keyWidth = w / NB;
  height = h;
  int count = 15;

  for (int i = 0; i < NB; i++) {
    int left = i * keyWidth;
    int right = left + keyWidth;

    if (i == NB - 1) {
      right = w;
    }

    RectF rect = new RectF(left, 0, right, h);
    whites.add(new Key(rect, i + 1));

    if (i != 0  &&   i != 3  &&  i != 7  &&  i != 10) {
      rect = new RectF((float) (i - 1) * keyWidth + 0.5f * keyWidth + 0.25f * keyWidth, 0, 
	                   (float) i * keyWidth + 0.25f * keyWidth, 0.67f * height);
      blacks.add(new Key(rect, count));
      count++;
    }
  }
}