private void initBottomSheet() {
    mBottomSheetBehavior = BottomSheetBehavior.from(findViewById(R.id.design_bottom_sheet));
    // 默认设置为隐藏
    mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
    mBottomSheetBehavior.setBottomSheetCallback(
        new BottomSheetBehavior.BottomSheetCallback() {
          @Override
          public void onStateChanged(@NonNull View bottomSheet, int newState) {
            Log.i(
                TAG,
                "onStateChanged bottomSheet "
                    + bottomSheet.getClass().getSimpleName()
                    + " newState "
                    + newState);
          }

          @Override
          public void onSlide(@NonNull View bottomSheet, float slideOffset) {
            Log.i(
                TAG,
                "onSlide bottomSheet "
                    + bottomSheet.getClass().getSimpleName()
                    + " newState "
                    + slideOffset);
          }
        });

    // 设置为 true 之后,点击或拖动时会被直接关闭
    //        mBottomSheetBehavior.setSkipCollapsed(true);
  }
  private void initBottomView() {
    CoordinatorLayout coordinatorLayout = (CoordinatorLayout) findViewById(R.id.cl_activity_scroll);
    assert coordinatorLayout != null;
    View view = coordinatorLayout.findViewById(R.id.ns_content_scroll);
    behavior = BottomSheetBehavior.from(view);

    behavior.setBottomSheetCallback(
        new BottomSheetBehavior.BottomSheetCallback() {
          boolean first = true;

          @Override
          public void onStateChanged(@NonNull View bottomSheet, int newState) {
            state = newState;
          }

          @Override
          public void onSlide(@NonNull View bottomSheet, float slideOffset) {
            if (first) {
              first = false;
              bottomSheet.setTranslationY(0);
            }
          }
        });
  }