How can I find the orientation of a picture taken with Intent MediaStore.ACTION_IMAGE_CAPTURE?

user_441621 0
Viewed 22216

When I take a picture with Android's camera app, it detects the phone's orientation and saves the picture accordingly. So if I take a picture of a building, the roof will be on the topside, whether I hold the phone in landscape position or portrait.

However, when I use

Intent imageCaptureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

to get a picture, the camera app doesn't react to the orientation. If I hold the phone vertically (portrait), the resulting picture will be rotated, with said building's roof to the left of the screen.

How can I set the intent so that the camera will take the orientation into account?

Or can I deduce in some way in what orientation the picture was taken and rotate it myself afterwards?

Or is there another way?

camera android-intent android
4 Answers

I found the answer. The Exif of the image has an indicator of the orientation. Just in case, Exif can be viewed in Android like this:

ExifInterface exif = new ExifInterface("filepath");  
exif.getAttribute(ExifInterface.TAG_ORIENTATION);
user_4416210

I used a file provider and nothing worked except making a temporary copy and reading the data from it.

public static int getOrientation(Context context, Uri uri) {

    int rotate = 0;

    try {

        ParcelFileDescriptor parcelFileDescriptor =
                context.getContentResolver().openFileDescriptor(uri, "r");

        FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();

        FileInputStream input = new FileInputStream(fileDescriptor);

        File tempFile = File.createTempFile("exif", "tmp");

        String tempFilename = tempFile.getPath();

        FileOutputStream output = new FileOutputStream(tempFile.getPath());

        int read;

        byte[] bytes = new byte[4096];

        while ((read = input.read(bytes)) != -1) {
            output.write(bytes, 0, read);
        }

        input.close();
        output.close();

        ExifInterface exif = new ExifInterface(tempFile.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;
        }

    } catch (Exception e) {
        Log.i(TAG, e.getLocalizedMessage());
    }

    return rotate;
}

bonus rotate function

public static Bitmap rotateImage(Context context, Uri uri, int orientation) throws IOException {

    ParcelFileDescriptor parcelFileDescriptor =
            context.getContentResolver().openFileDescriptor(uri, "r");
    FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
    Bitmap bitmap = BitmapFactory.decodeFileDescriptor(fileDescriptor);
    parcelFileDescriptor.close();

    if (orientation > 0) {
        Matrix matrix = new Matrix();
        matrix.postRotate(orientation);

        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    }

    return bitmap;
}
user_3384560
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