在使用BottomSheetDialog滑動消失後，再次點選顯示的時候，沒有成功顯示，BottomSheetBehavior被設定成了隱藏模式，需要在dismiss()的監聽中重新設定下狀態就可以了

View  bottomSheetView = getLayoutInflater().inflate(R.layout.bottomsheetdialog_layout, null);

BottomSheetDialog  bottomSheetDialog = new BottomSheetDialog(MainActivity.this);

bottomSheetDialog.setContentView(bottomSheetView);

BottomSheetBehavior  bottomSheetBehavior = BottomSheetBehavior.from((View) bottomSheetView.getParent());

bottomSheetDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {

            @Override

            public void onDismiss(DialogInterface dialog) {

                bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);

                textPrompt1.setText("OnDismiss");

            }

        });