Detect image orientation

ImageOrientation.java

private Bitmap bitmap = null;
  private void gellerySelectedPhoto(Uri imageUri){
 
  Uri uri = imageUri;
  try{
  
         String path =getRealPathFromURI(uri);
         ExifInterface exif = new ExifInterface(path);
         int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
         int angle = 0;
         if (orientation == ExifInterface.ORIENTATION_ROTATE_90) {
             angle = 90;
         } 
         else if (orientation == ExifInterface.ORIENTATION_ROTATE_180) {
             angle = 180;
         } 
         else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) {
             angle = 270;
         }
         Matrix mat = new Matrix();
         mat.postRotate(angle);
  
   Bitmap bmp = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
   bitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), mat, true);
  }
  catch (Exception e) {
   // TODO: handle exception
   e.printStackTrace();
  }
 
 }

 public String getRealPathFromURI(Uri contentUri) {
        String[] proj = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(contentUri, proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
 }