保存时图库图像会旋转

Question

我一直在尝试将图像保存到Firebase Storage，但我注意到从图库/Google 云端硬盘保存的几乎所有图片都会旋转。（通常是 90 度）

阅读较早的帖子后，我意识到这是一个常见问题，我尝试通过尝试来自此 post 或来自此 one 、此 one 的解决方案来解决它，我可以继续。

大约 8 小时后，我终于决定在这里提问。 是否有更好、更简单的实现来阻止图像旋转？

我使用ExifInterface（始终返回 0）的最后一个（显然是不成功的）实现是这个：
选择图片

Intent intent = new Intent();

            intent.setType("image/*");
            intent.setAction(Intent.ACTION_PICK);

            startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);

OnActivityResult

    @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        Uri selectedImage = data.getData();

        String[] filePathColumn = {MediaStore.Images.Media.DATA};

        Cursor cursor = getContext().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String filePath = cursor.getString(columnIndex);
        cursor.close();

        int rotateImageAngle = getPhotoOrientation(getContext(), selectedImage, filePath);

        try {
            bitmap = MediaStore.Images.Media.getBitmap(getContext().getContentResolver(), selectedImage);
            // Log.d(TAG, String.valueOf(bitmap));
            addPictureButton.setText("Done");
        } catch (IOException e) {
            e.printStackTrace();
        }

        if( bitmap != null)
        {
            RotateBitmap(bitmap , rotateImageAngle);
        }
    }

辅助方法

 public int getPhotoOrientation(Context context, Uri imageUri, String imagePath){
    int rotate = 0;
    try {
        context.getContentResolver().notifyChange(imageUri, null);
        File imageFile = new File(imagePath);

        ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
        int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

        switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_270:
                rotate = 270;
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                rotate = 180;
                break;
            case ExifInterface.ORIENTATION_ROTATE_90:
                rotate = 90;
                break;
        }

        Log.i("RotateImage", "Exif orientation: " + orientation);
        Log.i("RotateImage", "Rotate value: " + rotate);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return rotate;
}
public static Bitmap RotateBitmap(Bitmap source, int angle)
{
    Matrix matrix = new Matrix();
    matrix.postRotate(angle);
    return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
}

注意：如果需要，我将添加将图像上传到 Firebase 的代码

Answer 1

感谢this post，我找到了解决方案。

我将在下面发布代码的修改后的工作版本，供遇到此问题的任何人使用。

从图库中启动图片选择

                    Intent intent = new Intent(Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                intent.setType("image/*");
                startActivityForResult(intent, PICK_IMAGE_REQUEST);

OnActivityResult 检查所选图片的原始旋转

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK && requestCode == PICK_IMAGE_REQUEST) {

        // Get selected gallery image
        Uri selectedPicture = data.getData();
        // Get and resize profile image
        String[] filePathColumn = {MediaStore.Images.Media.DATA};
        // TRY getactvity() as well if not work
        Cursor cursor = getContext().getContentResolver().query(selectedPicture, filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        loadedBitmap = BitmapFactory.decodeFile(picturePath);

        ExifInterface exif = null;
        try {
            File pictureFile = new File(picturePath);
            exif = new ExifInterface(pictureFile.getAbsolutePath());
        } catch (IOException e) {
            e.printStackTrace();
        }

        int orientation = ExifInterface.ORIENTATION_NORMAL;

        if (exif != null)
            orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

        switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                loadedBitmap = rotateBitmap(loadedBitmap, 90);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                loadedBitmap = rotateBitmap(loadedBitmap, 180);
                break;

            case ExifInterface.ORIENTATION_ROTATE_270:
                loadedBitmap = rotateBitmap(loadedBitmap, 270);
                break;
        }
        imageView.setImageBitmap(loadedBitmap);
    }
}

RotateBitmap 方法

    public static Bitmap rotateBitmap(Bitmap bitmap, int degrees) {
    Matrix matrix = new Matrix();
    matrix.postRotate(degrees);
    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}