Android 从 MediaStore Uri 获取方向

Question

我似乎无法从 MediaStore Uri 获取图像的正确方向。 Uri 是从设备图库中选择图像后从 Chooser 意图返回的。

我已经尝试了以下我在网上找到的代码的所有组合，但似乎没有任何效果。无论图像的实际方向如何，此代码都将 orientation 设置为 0。

通过查看我设备上的图像细节，我知道实际方向不是 0。

public static void copyAndResizePhoto(Context context, Uri srcUri, File destFile) {
    String[] orientationColumn = {MediaStore.Images.Media.ORIENTATION};
    Cursor cursor = context.getContentResolver().query(srcUri, orientationColumn, null, null, null);
    int orientation = -1;
    if (cursor != null && cursor.moveToFirst()) {
        orientation = cursor.getInt(cursor.getColumnIndex(orientationColumn[0]));
    }
    if (cursor != null)
        cursor.close();
}

感谢任何帮助。谢谢。

Answer 1

我的原始解决方案仅适用于从 MediaStore 中选取的图像。以下解决方案适用于任何 Uri，这意味着无论用户从何处选择照片，此方法都会固定其方向。

以下方法需要两个库：metadata-extractor-2.6.4 and xmpcore-5.1.2.jar.

/**
 * Rotates the specified bitmap to the correct orientation. Note that this library requires
 * the following two libraries:
 * 1. <a href="https://code.google.com/p/metadata-extractor/downloads/list">metadata-extractor-2.6.4</a>
 * 2. <a href="https://github.com/drewfarris/metadata-extractor/tree/master/Libraries">xmpcore-5.1.2.jar</a>
 *
 * @param uri The Uri to the photo file.
 * @param bmp The Bitmap representative of the photo file.
 * @return A correctly rotated Bitmap.
 */
private static Bitmap fixOrientation(Uri uri, Bitmap bmp) {
    try {
        InputStream inputStream = mContext.getContentResolver().openInputStream(uri);
        Metadata meta = null;

        if (inputStream != null) {
            try {
                meta = ImageMetadataReader.readMetadata(new BufferedInputStream(inputStream), false);
            } catch (ImageProcessingException e) {
                e.printStackTrace();
            }

            if (meta != null) {
                int orientation = 0;
                ExifIFD0Directory exifIFD0Directory = meta.getDirectory(ExifIFD0Directory.class);

                if (exifIFD0Directory.containsTag(ExifIFD0Directory.TAG_ORIENTATION))
                    try {
                        orientation = exifIFD0Directory.getInt(ExifIFD0Directory.TAG_ORIENTATION);
                    } catch (MetadataException e){
                        e.printStackTrace();
                    }

                switch (orientation) {
                    case ExifInterface.ORIENTATION_ROTATE_90:
                        bmp = rotateBitmap(bmp, 90);
                        break;

                    case ExifInterface.ORIENTATION_ROTATE_180:
                        bmp = rotateBitmap(bmp, 180);
                        break;

                    case ExifInterface.ORIENTATION_ROTATE_270:
                        bmp = rotateBitmap(bmp, 270);
                        break;
                }
            }
        }

    } catch (IOException e) {
        Log.d(TAG, "Error opening InputStream from uri: " + uri.toString());
        e.printStackTrace();
    }

    return bmp;
}

享受，科恩

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