Xamarin.android 如何在dialogfragment与activity之间传递数据

我想通过按钮内的一个命令将数据从dialogfragment发送到activity

//code in dialogfragment
 ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(context);
                    ISharedPreferencesEditor editor = prefs.Edit();
                    editor.PutString("my_data", "some_data");
                    editor.Apply();

                    second = new SecondActivity();

                    String myData = prefs.GetString("my_data", "");
                    second.txtView.Text = myData; // textview in secondactivity

                    Dismiss();

---

根据您的描述，您需要首先在项目中创建Dialogfragment，然后在DialogmentFragment中加载布局

public class DialogFragment1: DialogFragment
{
    private TextView tv1;
    private TextView tv2;
    private Button btn1;

    public static DialogFragment1 NewInstance(Bundle bundle)
    {
        DialogFragment1 fragment = new DialogFragment1();
        fragment.Arguments = bundle;
        return fragment;
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        // Use this to return your custom view for this Fragment
        View view = inflater.Inflate(Resource.Layout.Signuplayout, container, false);
        tv1 = view.FindViewById<TextView>(Resource.Id.textView1);
        tv2= view.FindViewById<TextView>(Resource.Id.textView2);
        btn1 = view.FindViewById<Button>(Resource.Id.button1);

        btn1.Click += Btn1_Click;
        return view;
    }

    private void Btn1_Click(object sender, EventArgs e)
    {
        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Context);
        ISharedPreferencesEditor editor = prefs.Edit();
        editor.PutString("my_data", tv1.Text);
        editor.Apply();

        DialogFragment1 _exportFragment = (DialogFragment1)FragmentManager.FindFragmentByTag("Dialog Fragment");
        if (_exportFragment != null)
        {
            _exportFragment.Dismiss();
        }

    }
}

然后实例化一个Mainactivity，调用DialogFragment.cs中的getdata方法：

static  MainActivity mactivity;
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        // Use this to return your custom view for this Fragment
        View view = inflater.Inflate(Resource.Layout.Signuplayout, container, false);
        tv1 = view.FindViewById<TextView>(Resource.Id.textView1);
        tv2= view.FindViewById<TextView>(Resource.Id.textView2);
        btn1 = view.FindViewById<Button>(Resource.Id.button1);

        btn1.Click += Btn1_Click;
        mactivity = new MainActivity();
        return view;
    }

    private void Btn1_Click(object sender, EventArgs e)
    {
        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Context);
        ISharedPreferencesEditor editor = prefs.Edit();
        editor.PutString("my_data", tv1.Text);
        editor.Apply();

        DialogFragment1 _exportFragment = (DialogFragment1)FragmentManager.FindFragmentByTag("Dialog Fragment");
        if (_exportFragment != null)
        {
            _exportFragment.Dismiss();
        }

        mactivity.getdata();


    }

静态维护活动；
创建视图上的公共覆盖视图（布局、充气机、视图组容器、捆绑包保存状态）
{
//使用此选项可返回此片段的自定义视图
视图=充气机。充气（Resource.Layout.Signuplayout，container，false）；
tv1=view.findviewbyd（Resource.Id.textView1）；
tv2=view.findviewbyd（Resource.Id.textView2）；
btn1=view.findviewbyd（Resource.Id.button1）；
btn1.点击+=btn1\U点击；
mactivity=新的主活动（）；
返回视图；
}
私有无效Btn1_单击（对象发送方，事件参数e）
{
iSharedReferences prefs=PreferenceManager.GetDefaultSharedReferences（上下文）；
iSharedReferencesEditor=prefs.Edit（）；
编辑器.PutString（“我的_数据”，tv1.Text）；
editor.Apply（）；
DialogFragment1_exportFragment=（DialogFragment1）FragmentManager.FindFragmentByTag（“对话片段”）；
如果（_exportFragment！=null）
{
_exportFragment.disclose（）；
}
mactivity.getdata（）；
}

您的选择来自“一个命令”？数据传输过程只需单击一个按钮即可完成。我要解决的问题是，当我退出对话框时，变量add and get出现在mainactivity中，而没有按钮get The saved value。@ALIEA您的意思是想在DistrogFragment Disclose时显示数据，不需要单击按钮来获取它吗？如果是，请查看我的更新。

 private Button btn1;
    private Button btn2;

    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);
        btn1 = FindViewById<Button>(Resource.Id.button1);
        btn2 = FindViewById<Button>(Resource.Id.button2);

        btn1.Click += Btn1_Click;
        btn2.Click += Btn2_Click;
    }

    private void Btn2_Click(object sender, System.EventArgs e)
    {
        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Application.Context);
        string myData = prefs.GetString("my_data", "");
    }

    private void Btn1_Click(object sender, System.EventArgs e)
    {
        FragmentTransaction transcation = FragmentManager.BeginTransaction();
        DialogFragment1 signup = new DialogFragment1();
        signup.Show(transcation, "Dialog Fragment");

    }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" android:orientation="vertical">

   <Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:id="@+id/button1" android:text="Sign up"/>

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:text="get data" 
    android:id="@+id/button2"/>
</LinearLayout>

 public void getdata()
    {
        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Application.Context);
        string myData = prefs.GetString("my_data", "");
        Toast.MakeText(Application.Context,myData,ToastLength.Long).Show();
    }

static  MainActivity mactivity;
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        // Use this to return your custom view for this Fragment
        View view = inflater.Inflate(Resource.Layout.Signuplayout, container, false);
        tv1 = view.FindViewById<TextView>(Resource.Id.textView1);
        tv2= view.FindViewById<TextView>(Resource.Id.textView2);
        btn1 = view.FindViewById<Button>(Resource.Id.button1);

        btn1.Click += Btn1_Click;
        mactivity = new MainActivity();
        return view;
    }

    private void Btn1_Click(object sender, EventArgs e)
    {
        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Context);
        ISharedPreferencesEditor editor = prefs.Edit();
        editor.PutString("my_data", tv1.Text);
        editor.Apply();

        DialogFragment1 _exportFragment = (DialogFragment1)FragmentManager.FindFragmentByTag("Dialog Fragment");
        if (_exportFragment != null)
        {
            _exportFragment.Dismiss();
        }

        mactivity.getdata();


    }