Question

在我的自定义相机中，我需要保存拍摄图像的方向。此代码适用于其他Android版本。但它不适用于6.0.1。将属性保存到图像文件后，得到的结果是错误的。

try {
    exif = new ExifInterface(pictureFile.getAbsolutePath());
    exif.setAttribute(ExifInterface.TAG_ORIENTATION, "" + orientation);
    exif.saveAttributes();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 1

尝试此操作以保存捕获图像的不同角度方向： -

Options options = new Options();

// downsizing image as it throws OutOfMemory Exception for larger
// images

        options.inSampleSize = 8;
    ExifInterface exif;
    try {
        exif = new ExifInterface(fileUri.getPath());

        int orientation = exif.getAttributeInt(
                ExifInterface.TAG_ORIENTATION, 0);
        Log.d("EXIF", "Exif: " + orientation);
        Matrix matrix = new Matrix();
        if (orientation == 6) {
            matrix.postRotate(90);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 3) {
            matrix.postRotate(180);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 8) {
            matrix.postRotate(270);
            Log.d("EXIF", "Exif: " + orientation);
        }

        myBitmap = BitmapFactory.decodeFile(path_img, options);

        myBitmap = Bitmap.createBitmap(myBitmap, 0, 0,
                myBitmap.getWidth(), myBitmap.getHeight(), matrix,
                true);

    } catch (Exception e) {

    }

Answer 2

由于我遇到了来自不同制造商的EXIF信息的问题和不同行为，我建议您从保存的图像URI中获取方向，然后将其保存到EXIF界面。

public static void getImageOrientationFromUri(@NonNull ContentResolver contentResolver, @NonNull Uri uri) {
    if (uri.getPath() == null)
        throw new NullPointerException("URI Path should not be null");

        float rotationInDegrees = 0;

        Cursor cursor = contentResolver.query(uri, new String[]{MediaStore.Images.ImageColumns.ORIENTATION},
                null,
                null,
                null);

        if (cursor != null && cursor.moveToFirst()) {
            int col = cursor.getColumnIndex(MediaStore.Images.ImageColumns.ORIENTATION);
            if (col != -1)
                rotationInDegrees = cursor.getInt(col);
            cursor.close();
        }

        // here you can save to the EXIF interface getting the apropriate value from rotationInDegrees

        //If you want to display the image create the bitmap using:

        //Bitmap sourceBitmap = MediaStore.Images.Media.getBitmap(contentResolver, uri);

        //Matrix matrix = new Matrix();
        //matrix.preRotate(rotationInDegrees);

        //you can change the signature of the method to return a `Bitmap` and return 
        //Bitmap.createBitmap(sourceBitmap, 0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight(), matrix, false);

}

Answer 3

其他解决方案是重写图像而不是操纵EXIF信息。我建议像你尝试使用正确的常量一样：

try {
    exif = new ExifInterface(pictureFile.getAbsolutePath());
    exif.setAttribute(ExifInterface.TAG_ORIENTATION,
                      Integer.toString(ExifInterface.ORIENTATION_ROTATE_90));
    exif.saveAttributes();
} catch (IOException e) {
    e.printStackTrace();
}

根据源代码，您需要使用以下值之一：

ExifInterface.ORIENTATION_UNDEFINED
ExifInterface.ORIENTATION_NORMAL
ExifInterface.ORIENTATION_FLIP_HORIZONTAL
ExifInterface.ORIENTATION_ROTATE_180
ExifInterface.ORIENTATION_FLIP_VERTICAL
ExifInterface.ORIENTATION_TRANSPOSE
ExifInterface.ORIENTATION_ROTATE_90
ExifInterface.ORIENTATION_TRANSVERSE
ExifInterface.ORIENTATION_ROTATE_270

Answer 4

支持图书馆更新：

谷歌昨天在25.1.0发布了ExifInterface版本的支持库，其中包含大量更新，主要关注最近读取和写入图像文件的属性android版本。请查看SOURCE代码并了解此更新。

希望这有助于你

Android保存图片Exif信息在Marshmallow 6.0.1中出错

4 个答案: