Controlling the camera to take pictures in portrait doesn’t rotate the final images

The problem is when I saved the image I didn’t do well.

@Override
public void onPictureTaken(byte[] data, Camera camera) {

    String timeStamp = new SimpleDateFormat( "yyyyMMdd_HHmmss").format( new Date( ));
    output_file_name = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) + File.separator + timeStamp + ".jpeg";

    File pictureFile = new File(output_file_name);
    if (pictureFile.exists()) {
        pictureFile.delete();
    }

    try {
        FileOutputStream fos = new FileOutputStream(pictureFile);

        Bitmap realImage = BitmapFactory.decodeByteArray(data, 0, data.length);

        ExifInterface exif=new ExifInterface(pictureFile.toString());

        Log.d("EXIF value", exif.getAttribute(ExifInterface.TAG_ORIENTATION));
        if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("6")){
            realImage= rotate(realImage, 90);
        } else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("8")){
            realImage= rotate(realImage, 270);
        } else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("3")){
            realImage= rotate(realImage, 180);
        } else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("0")){
            realImage= rotate(realImage, 90);
        }

        boolean bo = realImage.compress(Bitmap.CompressFormat.JPEG, 100, fos);

        fos.close();

        ((ImageView) findViewById(R.id.imageview)).setImageBitmap(realImage);

        Log.d("Info", bo + "");

    } catch (FileNotFoundException e) {
        Log.d("Info", "File not found: " + e.getMessage());
    } catch (IOException e) {
        Log.d("TAG", "Error accessing file: " + e.getMessage());
    }
}

public static Bitmap rotate(Bitmap bitmap, int degree) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();

    Matrix mtx = new Matrix();
   //       mtx.postRotate(degree);
    mtx.setRotate(degree);

    return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
}