Android图库导入

Question

我正在使用图库选取器从图库中选取图像.照相机以纵向模式拍摄的照片在照片库中显示为笔直.但是当我导入照片时,我将照片旋转(横向).只有画廊显示这张照片是直的.如何管理这个问题？我希望所有照片都是它的实际方向.提前致谢

private void addImageFromGallery() {

    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select Picture"),
            GALLERY_CODE);

}

Answer 1

得到了答案.方向以EXIF格式保存.我们必须读取每个图像的数据的Orientation标签.

public static float rotationForImage(Context context, Uri uri) {
        if (uri.getScheme().equals("content")) {
        String[] projection = { Images.ImageColumns.ORIENTATION };
        Cursor c = context.getContentResolver().query(
                uri, projection, null, null, null);
        if (c.moveToFirst()) {
            return c.getInt(0);
        }
    } else if (uri.getScheme().equals("file")) {
        try {
            ExifInterface exif = new ExifInterface(uri.getPath());
            int rotation = (int)exifOrientationToDegrees(
                    exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                            ExifInterface.ORIENTATION_NORMAL));
            return rotation;
        } catch (IOException e) {
            Log.e(TAG, "Error checking exif", e);
        }
    }
        return 0f;
    }

    private static float exifOrientationToDegrees(int exifOrientation) {
    if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) {
        return 90;
    } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {
        return 180;
    } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {
        return 270;
    }
    return 0;
}
}

旋转值可用于校正照片的方向,如下所示:

Matrix matrix = new Matrix();
float rotation = PhotoTaker.rotationForImage(context, uri);
if (rotation != 0f) {
      matrix.preRotate(rotation);
 }

Bitmap resizedBitmap = Bitmap.createBitmap(
 sourceBitmap, 0, 0, width, height, matrix, true);