@NonNull
    @Override
    public AbsBoxingViewFragment onCreateBoxingView(ArrayList<BaseMedia> medias) {
        BoxingBottomSheetFragment fragment = (BoxingBottomSheetFragment) getSupportFragmentManager().findFragmentByTag(BoxingBottomSheetFragment.TAG);
        if (fragment == null) {
            fragment = BoxingBottomSheetFragment.newInstance();
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.content_layout, fragment, BoxingBottomSheetFragment.TAG).commit();
        }
        return fragment;
    }
Default UI Activity for simplest usage, containing layout achieve {@link BottomSheetBehavior}.
Only support SINGLE_IMG and VIDEO Mode.

@author ChenSL
boxing-impl/src/main/java/com/bilibili/boxing_impl/ui/BoxingBottomSheetActivity.java