DrawTiles.java

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    int width = getWidth();
    int height = getHeight();

    float size = (width > height ? height : width) - tileMargin * 2;
    float tileSize = size / 3;


    // draw tiles except from and to
    for (int[] tile : TILES) {
        if ((tile[0] == from[0] && tile[1] == from[1]) ||
                (tile[0] == to[0] && tile[1] == to[1])) {
            continue;
        }

        float left = tile[0] * (tileSize + tileMargin);
        float top = tile[1] * (tileSize + tileMargin);
        canvas.drawRect(left, top, left + tileSize, top + tileSize, paint);
    }

    // draw from
    float fromLeft = (from[0] + (to[0] - from[0]) * frame) * (tileSize + tileMargin);
    float fromTop = (from[1] + (to[1] - from[1]) * frame) * (tileSize + tileMargin);
    canvas.drawRect(fromLeft, fromTop, fromLeft + tileSize, fromTop + tileSize, paint);
}