在抛出OutOfMemoryError时从Gallery获取大图像的字节内容的正确策略

Question

首先我要说的是，加载大图片策略的描述是here。我知道有必要调整图像大小以省略OutOfMemoryError。我想从图像中获取字节，以便能够通过Internet发送它。

public byte[] getAttachment(Context context, String fullFilePath) {
    byte[] fileBytes = mFileUtil.readFileAsBytes(fullFilePath);
    if (fileBytes == null) {
        Logger.i("Unable to get bytes, trying through content resolver");
        try {
            fileBytes = mFileUtil.readFileFromContentResolver(context, fullFilePath);
        } catch (OutOfMemoryError e) {
            Uri imageUri = Uri.parse(fullFilePath);
            if (checkIfFileIsImage(context, imageUri)) {
                try {
                    InputStream stream = context.getContentResolver().openInputStream(imageUri);
                    if (stream == null) {
                        return null;
                    }
                    BitmapFactory.Options options = getOptions(stream, 2000, 2000);
                    stream.close();
                    stream = context.getContentResolver().openInputStream(imageUri);
                    if (stream == null) {
                        return null;
                    }
                    Bitmap bitmap = BitmapFactory.decodeStream(stream, null, options);
                    bitmap = rotateBitmap(context, imageUri, bitmap);
                    stream.close();
                    fileBytes = convertBitmapToArray(bitmap);
                } catch (Exception e1) {
                    Logger.e("Unable to get bytes using fallback method, attachment " +
                            "will not be added");
                } catch (OutOfMemoryError e2) {
                    Logger.e("Unable to get bytes using fallback method, because " +
                            "attachment is too big. Attachment will not be added");
                }
            }
            System.gc();
        }
    }
    return fileBytes;
}

FileUtil.class

public byte[] readFileAsBytes(String fileName) {
    File originalFile = new File(fileName);
    byte[] bytes = null;
    try {
        FileInputStream fileInputStreamReader = new FileInputStream(originalFile);
        bytes = new byte[(int) originalFile.length()];
        fileInputStreamReader.read(bytes);
    } catch (IOException e) {
    }
    return bytes;
}

public byte[] readFileFromContentResolver(Context context, String fileName) {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    InputStream is = null;
    InputStream inputStream = null;
    try {
        inputStream = context.getContentResolver().openInputStream(Uri.parse(fileName));
        is = new BufferedInputStream(inputStream);
        byte[] data = new byte[is.available()];
        is.read(data);
        bos.write(data);
    } catch (Exception e) {

    } finally {
        try {
            if (is != null) {
                is.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (IOException e1) {
        }
    }
    return bos.toByteArray();
}

正如您所看到的，此代码的目的是从byte[]获取Bitmap，而不是here。几乎在任何情况下都可以正常工作。然而，在使用较旧的Android系统的低端设备上（但也很少），它尤其容易出错。

我不喜欢设置largeHeap inside AndroidManifest.xml的想法，因为这只是掩盖问题而不是应对它。我也不想发送更小的图像。

是否可以通过任何其他方式改进这段代码以摆脱OutOfMemoryError？