我有codeD我的游戏小320x480和我的数字，支持多种分辨率的最简单方法是扩大最终图像。你有什么想法呢？难道是CPU的效率做这样？

I've coded my game for 320x480 and I figure that the easiest way to support multiple resolutions is to scale the end image. What are your thoughts on this? Would it be cpu efficient to do it this way?

我有我的所有图像放置在MDPI文件夹，我把它绘制未缩放屏幕上到一个缓冲区，然后缩放到适合屏幕。所有的用户输入将被缩小为好。

I have all my images placed in the mdpi folder, I'll have it drawn unscaled on the screen onto a buffer, then scale it to fit the screen. all the user inputs will be scaled as well.

我有以下2个问题： - 如何绘制一个位图没有机器人自动缩放它 - 如何在缩放位图？

I have these 2 questions: -How do you draw a bitmap without android automatically scaling it -How do you scale a bitmap?

推荐答案

我偶然发现了同样的问题，一些每次在我的项目时间，由于缺乏时间（和懒惰），我会满足于少比最佳的解决方案。但最近我发现一些时间来打击这一具体问题。下面是我的解决方案，我希望它可以帮助你。

I have stumbled upon the same problem a number of times in my projects and each time due to lack of time (and laziness) I would be satisfied with a less than optimum solution. But recently I found some time to crack down this particular issue. Here is my solution and I hope it helps you as well.

Bitmap scaleWithAspectRatio(Bitmap image)
        {
            int imaheVerticalAspectRatio,imageHorizontalAspectRatio;
            float bestFitScalingFactor=0;
            float percesionValue=(float) 0.2;

            //getAspect Ratio of Image
            int imageHeight=(int) (Math.ceil((double) image.getHeight()/100)*100);
            int imageWidth=(int) (Math.ceil((double) image.getWidth()/100)*100);
            int GCD=BigInteger.valueOf(imageHeight).gcd(BigInteger.valueOf(imageWidth)).intValue();
            imaheVerticalAspectRatio=imageHeight/GCD;
            imageHorizontalAspectRatio=imageWidth/GCD;
            Log.i("scaleDownLargeImageWIthAspectRatio","Image Dimensions(W:H): "+imageWidth+":"+imageHeight);
            Log.i("scaleDownLargeImageWIthAspectRatio","Image AspectRatio(W:H): "+imageHorizontalAspectRatio+":"+imaheVerticalAspectRatio);

            //getContainer Dimensions
            int displayWidth = getWindowManager().getDefaultDisplay().getWidth();
            int displayHeight = getWindowManager().getDefaultDisplay().getHeight();
           //I wanted to show the image to fit the entire device, as a best case. So my ccontainer dimensions were displayWidth & displayHeight. For your case, you will need to fetch container dimensions at run time or you can pass static values to these two parameters 

            int leftMargin = 0;
            int rightMargin = 0;
            int topMargin = 0;
            int bottomMargin = 0;
            int containerWidth = displayWidth - (leftMargin + rightMargin);
            int containerHeight = displayHeight - (topMargin + bottomMargin);
            Log.i("scaleDownLargeImageWIthAspectRatio","Container dimensions(W:H): "+containerWidth+":"+containerHeight);

            //iterate to get bestFitScaleFactor per constraints
            while((imageHorizontalAspectRatio*bestFitScalingFactor <= containerWidth) && 
                    (imaheVerticalAspectRatio*bestFitScalingFactor<= containerHeight))
            {
                bestFitScalingFactor+=percesionValue;
            }

            //return bestFit bitmap
            int bestFitHeight=(int) (imaheVerticalAspectRatio*bestFitScalingFactor);
            int bestFitWidth=(int) (imageHorizontalAspectRatio*bestFitScalingFactor);
            Log.i("scaleDownLargeImageWIthAspectRatio","bestFitScalingFactor: "+bestFitScalingFactor);
            Log.i("scaleDownLargeImageWIthAspectRatio","bestFitOutPutDimesions(W:H): "+bestFitWidth+":"+bestFitHeight);
            image=Bitmap.createScaledBitmap(image, bestFitWidth,bestFitHeight, true);

            //Position the bitmap centre of the container
            int leftPadding=(containerWidth-image.getWidth())/2;
            int topPadding=(containerHeight-image.getHeight())/2;
            Bitmap backDrop=Bitmap.createBitmap(containerWidth, containerHeight, Bitmap.Config.RGB_565);
            Canvas can = new Canvas(backDrop);
            can.drawBitmap(image, leftPadding, topPadding, null);

            return backDrop;
        }