sprockets/src/main/java/net/sf/sprockets/app/Fragments.java
@Nullable
    @SuppressWarnings("unchecked")
    public static <T extends Fragment> T findById(FragmentManager fm, @IdRes int id) {
        return (T) fm.findFragmentById(id);
    }
@Nullable
    @SuppressWarnings("unchecked")
    public static <T extends Fragment> T findById(FragmentManager fm, @IdRes int id) {
        return (T) fm.findFragmentById(id);
    }
Get the Fragment with the ID.

@return null if the Fragment isn't found
@since 4.0.0