Android 上传前压缩位图

我使用Facebook Parse将位图上传到服务器（因此在本例中，我希望使用PNG/JPEG格式，因为WEBP会给出一个错误）。我能够成功上传图像，我想知道的是，它是否可以更有效，如果我可以进一步降低JPEG的质量？（注意：图像将全屏显示）

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你的意思是除了从这里显示的70降低压缩质量之外？请参考@DougStevenson Yes。还有，如果我能降到70以下？在不影响所有手机屏幕的图像质量的情况下，我可以降低到多低？这听起来像是让你自己试验一下，看看什么是可以接受的。

    public void save_DetailStory_ToParse()
{
    DisplayMetrics displaymetrics = new DisplayMetrics();
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
    int height = displaymetrics.heightPixels;
    int width = displaymetrics.widthPixels;
    String filePath = iDataSave_path;
    final Bitmap bitmap = decodeSampledBitmapFromFilePath(getResources(), width, height, filePath.toString());


    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 70, stream);
    byte[] image = stream.toByteArray();
    ParseFile file = new ParseFile("androidbegin.jpeg", image);

    pObject_storyDetail.put(KEY_IMAGE_FILE, file);


    pObject_storyDetailList.add(pObject_storyDetail);
}

public static Bitmap decodeSampledBitmapFromFilePath(Resources res, int reqWidth, int reqHeight, String filePath)
{

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filePath, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;

    return BitmapFactory.decodeFile(filePath, options);
}

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) 
{
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;

    //int inSampleSize = 1;
    int inSampleSize = 2;

    if (height > reqHeight || width > reqWidth) 
    {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) 
        {
            inSampleSize *= 2;
        }
    }

    return inSampleSize;
}