尝试在空对象引用上调用接口方法

我正在尝试实现 modal bottom sheet，以允许用户选择相机/图库/删除选项，以便上传/删除个人资料图片。

Bottom sheet显示没有任何问题。但是，当用户单击任何选项时-抛出以下提到的错误。

尝试在空对象引用上调用接口方法'ImageChooserDialog $ BottomSheetListener.onOptionsClicked（java.lang.String）'

ImageChooserDialog.java类（Modal bottom sheet）：

public class ImageChooserDialog extends BottomSheetDialogFragment {

CircularImageView camera,gallery,remove;

public static final String TAG = "ImageChooserDialog"; private BottomSheetListener bottomSheetListener;

@Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_image_choose_dialog, container, false); camera = v.findViewById(R.id.imagechooser_camera); gallery = v.findViewById(R.id.imagechooser_gallery); remove = v.findViewById(R.id.imagechooser_remove);

camera.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (bottomSheetListener != null)
        {
            bottomSheetListener.onOptionsClicked("Camera");
            dismiss();
        }else {
            Toast.makeText(getActivity(), "Initialize", Toast.LENGTH_SHORT).show();
        }

    }
});

gallery.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (bottomSheetListener != null)
        {
            bottomSheetListener.onOptionsClicked("Gallery");
            dismiss();
        }else {
            Toast.makeText(getActivity(), "Initialize", Toast.LENGTH_SHORT).show();
        }

    }
});

remove.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (bottomSheetListener != null)
        {
            bottomSheetListener.onOptionsClicked("Remove");
            dismiss();
        }else {
            Toast.makeText(getActivity(), "Initialize", Toast.LENGTH_SHORT).show();
        }
    }
});
return v;

}

@Override public int getTheme() { return R.style.BottomSheetDialogTheme; }

@Override public void onAttach(Context context) { super.onAttach(context); try { bottomSheetListener = (BottomSheetListener) getParentFragment(); }catch (ClassCastException e) { throw new ClassCastException(context.toString()+"must implement BottomSheetListener"); } }

public interface BottomSheetListener{ void onOptionsClicked(String option); } }

EditProfile.java类（片段）

public class EditProfile extends Fragment implements ImageChooserDialog.BottomSheetListener {

//to open modal bottom sheet

private void openOptionsBox() { ImageChooserDialog fragment= new ImageChooserDialog(); fragment.show(getFragmentManager(),ImageChooserDialog.TAG); }

@Override public void onOptionsClicked(String option) { Toast.makeText(getContext(), ""+option, Toast.LENGTH_SHORT).show(); }

}