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如何删除底部工作表对话框片段中的白色背景？

我试图在回答这个或设置在布局XML透明背景，但仍得到这样的结果

这是我的代码

public class BottomSheetFragment extends BottomSheetDialogFragment {

private Record record;

private MainFragment fragment;

public static BottomSheetFragment getInstance() {
    return new BottomSheetFragment ();
}

public BottomSheetFragment setRecord(Record record) {
    this.record = record;
    return this;
}

public BottomSheetFragment setFragment(MainFragment fragment) {
    this.fragment = fragment;
    return this;
}

@TargetApi(Build.VERSION_CODES.O)
@Override
public void onViewCreated(View view, @Nullable final Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
    getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT);
    setStyle(DialogFragment.STYLE_NO_FRAME, android.R.style.Theme);

    //Set content
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable …