public static ActivityBuilder activity(@Nullable Uri uri) {
    return new ActivityBuilder(uri);
  }
Create {@link ActivityBuilder} instance to start {@link CropImageActivity} to crop the given
image.<br>
Result will be received in {@link Activity#onActivityResult(int, int, Intent)} and can be
retrieved using {@link #getActivityResult(Intent)}.

@param uri the image Android uri source to crop or null to start a picker
@return builder for Crop Image Activity
core/src/main/java/com/theartofdev/edmodo/cropper/CropImage.java