Just for testing.

test.java

@Override
    public synchronized Bitmap getMosaicTile(String hexColor, int tileWidth, int tileHeight) throws Exception {
        Bitmap newBmp = Bitmap.createBitmap(tileWidth, tileHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(newBmp);
        RectF rectF = new RectF(padding, padding, tileWidth - padding, tileHeight - padding);
        paint.setColor(Color.parseColor("#" + hexColor));
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return newBmp;
    }