To change the orientation of an image write the following code:

BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = 2; 
// Get the original bitmap from the filepath to which you want to change orientation
// fileName ist the filepath of the image
Bitmap cachedImage=BitmapFactory.decodeFile(fileName, o2);

int rotate = getCameraPhotoOrientation(imageViewer, fileName);
Matrix matrix = new Matrix();
matrix.postRotate(rotate);
// Here you will get the image bitmap which has changed orientation
cachedImage = Bitmap.createBitmap(cachedImage , 0, 0, cachedImage.getWidth(), cachedImage.getHeight(), matrix, true);

Get the original photo orientation

public static int getCameraPhotoOrientation(Context context, String imagePath)
    {
        int rotate = 0;
        try {
            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;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return rotate;
    }
    

Hope this will help you :)