public void setOnCropImageCompleteListener(OnCropImageCompleteListener listener) {
    mOnCropImageCompleteListener = listener;
  }
Set the callback to be invoked when image async cropping image ({@link #getCroppedImageAsync()}
or {@link #saveCroppedImageAsync(Uri)}) is complete (successful or failed).
core/src/main/java/com/theartofdev/edmodo/cropper/CropImageView.java