Scale a Bitmap preserving the aspect ratio

scale.java

    // Scale a bitmap preserving the aspect ratio.
    private Bitmap scale(Bitmap bitmap, int maxWidth, int maxHeight) {
        // Determine the constrained dimension, which determines both dimensions.
        int width;
        int height;
        float widthRatio = (float)bitmap.getWidth() / maxWidth;
        float heightRatio = (float)bitmap.getHeight() / maxHeight;
        // Width constrained.
        if (widthRatio >= heightRatio) {
            width = maxWidth;
            height = (int)(((float)width / bitmap.getWidth()) * bitmap.getHeight());
        }
        // Height constrained.
        else {
            height = maxHeight;
            width = (int)(((float)height / bitmap.getHeight()) * bitmap.getWidth());
        }
        Bitmap scaledBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        float ratioX = (float)width / bitmap.getWidth();
        float ratioY = (float)height / bitmap.getHeight();
        float middleX = width / 2.0f;
        float middleY = height / 2.0f;
        Matrix scaleMatrix = new Matrix();
        scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);

        Canvas canvas = new Canvas(scaledBitmap);
        canvas.setMatrix(scaleMatrix);
        canvas.drawBitmap(bitmap, middleX - bitmap.getWidth() / 2, middleY - bitmap.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
        return scaledBitmap;
    }

Worked flawlessly, thanks! :P