如何在xamarin android的MainActivity上的dialogFragment中显示editText的文本？答案

【问题标题】：how show text of editText in dialogFragment on MainActivity in xamarin android?如何在xamarin android的MainActivity上的dialogFragment中显示editText的文本？
【发布时间】：2021-09-10 23:01:39
【问题描述】：

我正在使用 dialogfragment 在 Xamarin Android 中制作登录页面。我想点击登录按钮（下图），关闭后在 MainActivity 的对话框中显示用户名文本。请帮帮我！ enter image description here

loginDialog 类：

class loginDialog:DialogFragment
{

    EditText txtUser;
    Button btnLogin;
    private Context context;
    public loginDialog(Context context)
    {
        this.context = context;
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        base.OnCreateView(inflater, container, savedInstanceState);
        var view = inflater.Inflate(Resource.Layout.dialog_layer, container, false);
        txtUser = view.FindViewById<EditText>(Resource.Id.txtUser);
        btnLogin = view.FindViewById<Button>(Resource.Id.btnLogin);
        btnLogin.Click += BtnLogin_Click;

        return view;
    }
    private void BtnLogin_Click(object sender, EventArgs e)
    {
        Dismiss();
    }
}

主活动：

public class MainActivity : AppCompatActivity
{
    TextView userName;
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.activity_main);

        userName = FindViewById<TextView>(Resource.Id.lblUserName);

        FragmentTransaction ft = FragmentManager.BeginTransaction();
        loginDialog ld = new loginDialog(this);
        ld.Show(ft, "");
    }


    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

谢谢。

【问题讨论】：

标签： xamarin dialogfragment

【解决方案1】：

您可以在对话框中调用 findViewById，如下所示：

EditText editText = (EditText) getDialog().findViewById(Resource.id.project_name);
if (editText != null) {
    Log.e("", "Value is: " + editText.getText());
} else {
    Log.e("", "EditText not found!");
}

【讨论】：