java - DialogFragment OnDismissListener 未被调用

Question

我刚刚做了一个构建，注意到我的代码不起作用，在设置了一些断点之后，我看到，事实上，dismiss();方法被调用，但问题是监听器没有被调用，因此监听器内的代码永远不会被执行。我有我的 fragment A，在其中显示我的 DialogFragment (DateDialog)，当 DateDialog 被解除时，我应该从我的 fragment A 中获取一些 DateDialog 值，但它不起作用。这是我原来的代码，它不起作用:

//DATEDIALOG
@Nullable
    @Override

    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.datedialog, container, false);

        localf = android.text.format.DateFormat.getMediumDateFormat(getContext());

         TomorrowB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setTomorrow();
                HasDate = true;
                dismiss();
            }
        });

        return v;
    }

//FRAGMENT A
DateB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final DateDialog d = new DateDialog();
                d.show(getChildFragmentManagaer(), "DateDialog");
                getChildFragmentManager().executePendingTransactions();
                d.getDialog().setOnDismissListener(new DialogInterface.OnDismissListener() {
                @Override
                public void onDismiss(DialogInterface dialog) {
                        if (d.HasDate())
                           {
                             DoStuff();
                           }
                      }

    });

然后，我决定更新它，改用一个界面，但它也不起作用。

    //DATEDIALOG
     public interface DismissListener{
            void onDialogDismiss(DateDialog d);
        }

        private DismissListener mListener;

        public void setDismissListener(DismissListener listener){
            mListener = listener;
        }


        @Nullable
        @Override

        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.datedialog, container, false);

            localf = android.text.format.DateFormat.getMediumDateFormat(getContext());

             TomorrowB.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    setTomorrow();
                    HasDate = true;
                    dismiss();
                }
            });

            return v;
        }


//FRAGMENT A

DateB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final DateDialog d = new DateDialog();
                d.setDismissListener(new DateDialog.DismissListener() {
                    @Override
                    public void onDialogDismiss(DateDialog d) {
if (d.HasDate())
                               {
                                 DoStuff();
                               }
                          }

我也尝试过 OnCancelListener() 但它是相同的。
PS:
这确实有效，直到前几天，我不知道我从支持库迁移到AndroidX库是否有什么关系。

Answer 1

根据 onCreateDialog documentation :

Note: DialogFragment own the Dialog.setOnCancelListener and Dialog.setOnDismissListener callbacks. You must not set them yourself. To find out about these events, override onCancel(DialogInterface) and onDismiss(DialogInterface).

情况一直如此。

您应该创建自己的回调接口(interface)并从 DateDialog 的 onDismiss() 调用该接口(interface)，而不是直接调用 setOnDismissListener:

class DateDialog {
    interface DismissListener {
        void onDismiss(boolean hasDate)
    }

    private DismissListener listener = null;

    public void setDismissListener(DismissListener listener) {
        this.listener = listener;
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        super.onDismiss(dialog);
        if (listener != null) {
            listener.onDismiss(HasDate);
        }
    }
}

然后像这样使用它:

 final DateDialog d = new DateDialog();
 d.show(getChildFragmentManager(), "DateDialog");
 getChildFragmentManager().executePendingTransactions();
 d.setDismissListener(new DismissListener() {
     @Override
     public void onDismiss(boolean hasDate) {
         if (hasDate) {
             DoStuff();
         }
     }
 });