Java Merge Multiple Bitmaps, horizontally or vertically

mergeBitmaps.java

private Bitmap combineBitmaps(ArrayList<Bitmap> bitmaps, Boolean isHorizontal) {
    int w = 0, h = 0;
    for (int i = 0; i < bitmaps.size(); i++) {
        if(i == 0 || isHorizontal){
            w += bitmaps.get(i).getWidth();
        } else if(!isHorizontal && bitmaps.get(i).getWidth() > w) {
            w = bitmaps.get(i).getWidth();
        }
        if(i == 0 || !isHorizontal){
            h += bitmaps.get(i).getHeight();
        } else if(isHorizontal && bitmaps.get(i).getHeight() > h) {
            h = bitmaps.get(i).getHeight();
        }
    }
    Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    int pos = 0;
    for (int i = 0; i < bitmaps.size(); i++) {
        if(isHorizontal){
            canvas.drawBitmap(bitmaps.get(i), pos, 0f, null);
        } else {
            canvas.drawBitmap(bitmaps.get(i), 0f, pos, null);
        }
        pos += isHorizontal ? bitmaps.get(i).getWidth() : bitmaps.get(i).getHeight();
    }
    return bitmap;
}