MainActivity.java

View bottomSheet;
private BottomSheetDialog mBottomSheetDialog;

private void initView(){
         /*
        Bottom Sheet Initialization
         */
        CoordinatorLayout coordinatorLayout = (CoordinatorLayout)findViewById(R.id.main_content);
        // The View with the BottomSheetBehavior
        bottomSheet = coordinatorLayout.findViewById(R.id.bottom_sheet);
        behavior = BottomSheetBehavior.from(bottomSheet);
//        behavior.setState(BottomSheetBehavior.STATE_HIDDEN);
        behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet,int newState) {
                // React to state change
                CommonMethods.getInstance().e("onStateChanged","onStateChanged:" + newState);
                if (newState == BottomSheetBehavior.STATE_EXPANDED) {
                    fab.setVisibility(View.GONE);
                } else {
                    fab.setVisibility(View.VISIBLE);
                }
            }

            @Override
            public void onSlide(@NonNull View bottomSheet,float slideOffset) {
                // React to dragging events
                CommonMethods.getInstance().e("onSlide","onSlide");
            }
        });

        behavior.setPeekHeight(100);

    }

点击事件代码：

@Override
    public void onShareClick() {
        if (behavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {
            behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        }
        if(mBottomSheetDialog==null){
            mBottomSheetDialog = new BottomSheetDialog(this);
            View view = getLayoutInflater().inflate(R.layout.layout_bottomsheet,null);
            mBottomSheetDialog.setContentView(view);
        }

        mBottomSheetDialog.show();
        mBottomSheetDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
            @Override
            public void onDismiss(DialogInterface dialog) {
                mBottomSheetDialog = null;
            }
        });
    }