从BottomSheetDialogFragment访问BottomSheetBehaviour

Question

我想设置底页对话框片段的窥视高度，但是我无法在片段中定义底页行为，有人可以帮助我吗？

getDialog（）在oncreateview方法中返回null

  SpinnerCity.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
     State cityDetails = statesList.get(position); // here do like this
     List<String> cityList = cityDetails.getCities();
     ArrayAdapter citiesAdapter = new ArrayAdapter<>(this,
                    R.layout.city_list, R.id.citySpinnerText, cityList);
     SpinnerArea.setAdapter(citiesAdapter);
  //   SpinnerArea.setSelected(String city); // Remove this, no use
    }

Answer 1

您需要在onCreateDialog中调用它

这是代码：

 @Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);

    dialog.setOnShowListener(dialogInterface -> {
        BottomSheetDialog d = (BottomSheetDialog) dialogInterface;

        FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
        BottomSheetBehavior bsb = BottomSheetBehavior
                .from(bottomSheet);

        bsb.setPeekHeight(56/*Your height*/);

    });

    return dialog;
}