如何在对话片段中使用活动的方法

本文关键字：活动 方法 对话 片段 | 更新日期: 2023-09-27 18:10:16

我是c#编程和Android开发的新手。我试图建立一个应用程序，我需要帮助。这是我的对话片段类，我希望使用的方法是在另一个Activity (Member_Activity)，(其命名为country_set)

public class Search_Dialog: DialogFragment
{
    private EditText mName,mFathersName;
    private Member_Activity activity;
    private Button mSearchButton;
    private ArrayAdapter mCountryListAdapter;
    private AutoCompleteTextView mCountry;
    private List<string> mList;

    public event EventHandler<SearchEventArgs> searchDialogFilled;
    public override Android.Views.View OnCreateView (Android.Views.LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState)
    {
        var view=inflater.Inflate (Resource.Layout.Dialog_Search, container, false);
        activity = new Member_Activity ();
        mName = view.FindViewById<EditText> (Resource.Id.Name);
        mFathersName = view.FindViewById<EditText> (Resource.Id.FathersName);
        mCountry = view.FindViewById<AutoCompleteTextView> (Resource.Id.Country);
        mSearchButton = view.FindViewById<Button> (Resource.Id.SearchBtn);
        return view;
    }
    void MSearchButton_Click (object sender, EventArgs e)
    {
        searchDialogFilled.Invoke (this, new SearchEventArgs (mName.Text, mFathersName.Text, "", "", "", "", "", "", "",""));
        this.Dismiss();
    }
    public override void OnActivityCreated (Bundle savedInstanceState)
    {
        Dialog.Window.RequestFeature (WindowFeatures.NoTitle);
        base.OnActivityCreated (savedInstanceState);
        mList = activity.country_set ();
        mCountryListAdapter = new ArrayAdapter (this.Activity, Android.Resource.Layout.SimpleDropDownItem1Line, mList);
        mCountry.Adapter = mCountryListAdapter;
    }        
}
public class Member_Activity : Activity
{
    public List<string> country_set()   
    {
        mCountryUrl = new Uri ("http://theredcatalyst.com/jain-samaj/restservice/country");
        mList = new List<string> ();
        mCountry = new List<Country> ();
        adapter = new ArrayAdapter (this, Android.Resource.Layout.SimpleSpinnerItem);
        WebClient client = new WebClient ();
        client.DownloadDataAsync (mCountryUrl);
        client.DownloadDataCompleted += (sender, e) => {
          RunOnUiThread (() => {
           string json = Encoding.UTF8.GetString (e.Result);
           mCountry = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Country>> (json);
           var mList = mCountry.Select(c=>c.name).ToList();
          });
       }; 
       return mList;
    }
}

请帮帮我。我该怎么做呢?

如何在对话片段中使用活动的方法

通过在片段OnCreate中手动创建Member_Activity，您绕过了活动设置的正常方式，因此它将处于无效状态。

提供Search_Fragment总是由Member_Activity拥有，您可以通过转换片段Activity属性来访问引用:

activity = base.Activity as Member_Activity;
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