我遇到一个问题,当我将位图写入磁盘时,它会写入磁盘,但是会以微缩图像(文件大小为3kb或更小)的形式写入。

我检查了源图像的大小确实正确,但是尽管将位图选项配置为不缩放,但输出图像似乎缩小了。

@Override
protected Void doInBackground(PPImage... params) {
    String filename = "pp_" + position + ".jpg";
    File externalStorageDirectory = Environment.getExternalStorageDirectory();
    final File destination = new File(externalStorageDirectory, filename);

    BitmapFactory.Options opts = new BitmapFactory.Options();
    opts.inSampleSize = 16;
    opts.inPurgeable = true;
    opts.inScaled = false;

    decode(opts, Uri.parse(params[0].getUri()), getActivity(), new OnBitmapDecodedListener() {
        @Override
        public void onDecoded(Bitmap bitmap) {
            try {
                FileOutputStream out = new FileOutputStream(destination, false);
                writeImageToFileTask.this.holder.pathToImage = destination.getAbsolutePath();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
                out.flush();
                out.close();

                MediaStore.Images.Media.insertImage(getActivity().getContentResolver(), destination.getAbsolutePath(), destination.getName(), destination.getName());
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });

    return null;
}

private void decode(BitmapFactory.Options options, Uri mUri, Context mContext, OnBitmapDecodedListener listener) {
    try {
        InputStream inputStream;
        if (mUri.getScheme().startsWith("http") || mUri.getScheme().startsWith("https")) {
            inputStream = new URL(mUri.toString()).openStream();
        } else {
            inputStream = mContext.getContentResolver().openInputStream(mUri);
        }

        Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, options);

        listener.onDecoded(bitmap);
    } catch (Exception e) {
        e.printStackTrace();
    }
}


如何确保写入文件的图像与原始源图像的尺寸相同?

最佳答案

您已在代码中指定了样本大小,这将导致调整大小:

opts.inSampleSize = 16;


只需删除这条线,并且输出图像的尺寸应相同。

关于inSampleSize的用法,根据official doc


  例如,inSampleSize == 4返回图像的1/4。
  原稿的宽度/高度,和1/16像素数。任何值
  
10-07 19:19
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