Android使用CoordinatorLayout实现底部弹出菜单

compile "com.android.support:design:${project.properties.get("support")}"

  
    //页面布局
    

  

//找到BottomSheetBehavior
BottomSheetBehavior behavior = BottomSheetBehavior.from(findViewById(R.id.au_bottom_sheet));

//设置弹出高度
 behavior.setPeekHeight(WindowHeight / 2);
 //默认隐藏
 behavior.setState(BottomSheetBehavior.STATE_HIDDEN);
 //添加消失监听
 behavior.setBottomSheetCallback(bottomSheetCallback);

 //状态监听，通过这个监听菜单是否消失
  private BottomSheetBehavior.BottomSheetCallback bottomSheetCallback = new BottomSheetBehavior.BottomSheetCallback() {
    @Override
    public void onStateChanged(@NonNull View bottomSheet, int newState) {
      if (newState == BottomSheetBehavior.STATE_HIDDEN) {
        if (!isBehaviorShowing(behavior)) {
          //菜单已经消失
        }
      }

    }

    @Override
    public void onSlide(@NonNull View bottomSheet, float slideOffset) {
    //滑动监听
    }
  };

 private Boolean isBehaviorShowing(BottomSheetBehavior behavior) {
    return behavior.getState() == BottomSheetBehavior.STATE_COLLAPSED
        || behavior.getState() == BottomSheetBehavior.STATE_EXPANDED
        || behavior.getState() == BottomSheetBehavior.STATE_SETTLING;
  }

behavior.setState(BottomSheetBehavior.STATE_HIDDEN);

 behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);