Xamarin Android dialog.PositiveButtonClicked 不工作

Question

当用户单击对话框中的“确定”按钮（DialogFragment）时，我想运行一些代码（使用 Intent to go to new Activity）

我在调试器中看到它命中了 for.Show 的代码行。 但它似乎跳过了 PositiveButtonClicked 和 go 之后的代码行。

为什么 PositiveButtonClicked 不起作用？

我试过在前后以及内部添加额外的行。 我仔细检查了对话框是否有一个 positivebutton 设置为“Ok”。我还有其他与 PositiveButtonClicked 的对话框可以在这个 Activity 上工作，所以我不确定为什么这个不起作用

C#：

private async Task ProcessExistingFamilyMembers(AccountAddFamilyMemberState state)
{
    
    cafdialog.Show(this.FragmentManager, "cafdialog");
    cafdialog.PositiveButtonClicked += (args1) =>
    { 
        Intent intent = new Intent(this, typeof(OrderSummaryActivity));
        intent.PutExtra<AccountSubscriptionInfo>("account_subscription_info", info);
        SubscriptionChangeInfo changeInfo = new SubscriptionChangeInfo() { Last4ofCC = aafmi.Last4ofCC, NextBillingDate = aafmi.NextBillingDate };
        intent.PutExtra<SubscriptionChangeInfo>("subscription_change_info", changeInfo);
        StartActivity(intent);
        Finish();
    };
}

Answer 1

您可以创建继承 DialogFragment 的DialogFragment ：

[Obsolete]
    public class AlertDialogFragment : DialogFragment
    {
        [Obsolete]
        public override Dialog OnCreateDialog(Bundle savedInstanceState)
        {
            var builder = new AlertDialog.Builder(Activity)
                .SetMessage("This is my dialog.")
                .SetPositiveButton("Ok", (sender, args) =>
                {
                    //use Intent to go to new Activity
                    var intent = new Intent(Context, typeof(Activity1));
                    StartActivity(intent);
                })
                .SetTitle("Custom Dialog");
            return builder.Create();
        }
    }

在 MainActivity.cs 中，在 OnCreate() 中调用 ShowDialog()：

...
[System.Obsolete]
#pragma warning disable CS0809 // Obsolete member overrides non-obsolete member
        protected override void OnCreate(Bundle savedInstanceState)
#pragma warning restore CS0809 // Obsolete member overrides non-obsolete member
        {
            ...
            ShowDialog();
        }

       [System.Obsolete]
        public void ShowDialog()
        {
            var transaction = FragmentManager.BeginTransaction();
            var dialogFragment = new AlertDialogFragment();
            dialogFragment.Show(transaction, "dialog_fragment");
        }