private void showFragment() {
        if (mInsideBottomSheet != null) {
            BottomSheetBehavior behavior = BottomSheetBehavior.from(mInsideBottomSheet);
            if (behavior.getState() != BottomSheetBehavior.STATE_EXPANDED) {
                behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            } else {
                behavior.setState(BottomSheetBehavior.STATE_HIDDEN);
            }
        }
    }
to show use {@link AbsBoxingViewFragment} without {@link AbsBoxingActivity}.
use {@link Boxing#setupFragment(AbsBoxingViewFragment, Boxing.OnBoxingFinishListener)} to set a fragment.

@author ChenSL
app/src/main/java/com/bilibili/boxing/ui/SecondActivity.java