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我正在开发一个包含许多图像的应用程序。由于应用程序限制（50MB），我将一些图像移至扩展文件。在我将所有图像放入不同的文件夹（如 drawable-xhdpi、drawable-mdpi 等）之前。现在我以编程方式确定手机的 dpi 并相应地获取图像。以下是重要的代码位：

    public String getFolder()
    {
        String folder = "";
        int dpi = res.getDisplayMetrics().densityDpi;

        int widthPixels = metrics.widthPixels;
        int heightPixels = metrics.heightPixels;

        float scaleFactor = metrics.density;
        float widthDp = widthPixels / scaleFactor;
        float heightDp = heightPixels / scaleFactor;

        float smallestWidth = Math.min(widthDp, heightDp);

        if (smallestWidth > 720 && dpi == DisplayMetrics.DENSITY_MEDIUM) {
            //Device is a 10" tablet
        } 
        else if (dpi == DisplayMetrics.DENSITY_XHIGH||dpi == DisplayMetrics.DENSITY_TV) {
            //Device is a 7" tablet
            //xhdpi
            folder = "drawable-xhdpi/";
        }
        else if((smallestWidth > 480 && dpi == DisplayMetrics.DENSITY_MEDIUM)|| dpi == DisplayMetrics.DENSITY_HIGH)
        {
            //hdpi
            folder = "drawable-hdpi/";

        }
        else if(dpi == DisplayMetrics.DENSITY_XXHIGH)
        {
            //xxhdpi
            folder = "drawable-xxhdpi/";

        }
        else if(dpi == DisplayMetrics.DENSITY_MEDIUM)
        {
            //mdpi
            folder = "drawable-mdpi/";

        }
        else if(dpi == DisplayMetrics.DENSITY_LOW)
        {
            //ldpi
            folder = "drawable-ldpi/";
        }

        return folder;
    }
public BitmapDrawable getDrawable(Context ctx, String imageName){
    String path = folder+imageName;
    ZipResourceFile zip;
    BitmapFactory.Options bfo = new BitmapFactory.Options();
    bfo.inPreferredConfig = Bitmap.Config.ARGB_8888;

    Bitmap b = null;
    try {
         zip = APKExpansionSupport.getAPKExpansionZipFile(ctx, 9, -1);
        InputStream is = zip.getInputStream(path);
         b = BitmapFactory.decodeStream(is, null, bfo);     }
    catch (IOException e) {
        e.printStackTrace();
    }
    return new BitmapDrawable(b);
}

因此，每当我需要图像时，我都会像这样调用 getDrawable：

newItem.setBackgroundDrawable(storage.getDrawable(this,"red_stored.png"));

但问题是，现在当我以编程方式执行此操作时，图像看起来比我将其放入 drawable-xhdpi 文件夹并且 android 自动从该文件夹中选择它时要小。我能做些什么来解决这个问题？

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