private void callbackError() {
        if (mCallback != null) {
            mCallback.onError(CameraPickerHelper.this);
        }
    }
start system camera to take a picture

@param activity      not null if fragment is null.
@param fragment      not null if activity is null.
@param subFolderPath a folder in external DCIM,must start with "/".
boxing/src/main/java/com/bilibili/boxing/utils/CameraPickerHelper.java