ChatHeadMaker.java

    /**
     * Constructing a bitmap that contains the given bitmaps(max is three).
     * 
     * For given two bitmaps the result will be a half and half bitmap.
     * 
     * For given three the result will be a half of the first bitmap and the second 
     * half will be shared equally by the two others. 
     * 
     * @param  bitmaps Array of bitmaps to use for the final image.
     * @param  width width of the final image, A positive number.
     * @param  height height of the final image, A positive number.               
     * @return A Bitmap containing the given images.
     * */
    @Nullable public static Bitmap getMixImagesBitmap(@Size(min = 1) int width,@Size(min = 1) int height, @NonNull Bitmap...bitmaps){

        if (height == 0 || width == 0) return null;

        if (bitmaps.length == 0) return null;

        Bitmap finalImage = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(finalImage);

        Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG);

        if (bitmaps.length == 2){
            canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[0], width/2, height), 0, 0, paint);
            canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[1], width/2, height), width/2, 0, paint);
        }
        else{
            canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[0], width/2, height), 0, 0, paint);
            canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[1], width/2, height/2), width/2, 0, paint);
            canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[2], width/2, height/2), width/2, height/2, paint);
        }

        return finalImage;
    }