c# - 编辑未在框架布局中显示的文本

Question

我通过在框架布局中在运行时创建片段来实现谷歌地图 API，之后我在地图顶部添加了一个按钮，它显示得很好，但是当我添加一个编辑文本时它没有显示，尽管我已经声明并初始化了它在我的活动课上。

这是我的xml代码

 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/map_placeholder">


   
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:id="@+id/search_text"
            android:hint="Enter Location"
            android:textColor="#000"/>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Search location"
            android:id="@+id/btn_srch_1"
            android:layout_marginTop="60dp"/>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/btn_set_1"
            android:layout_marginTop="500dp"
            android:text="Set location"/>
    

 
        </FrameLayout>

这是我的活动类代码

地图活动.cs

using Android.Gms.Maps;
using Android.Gms.Maps.Model;
using Android.OS;
using Android.Support.V4.App;
using Android.Widget;
using System;
using Xamarin.Essentials;

namespace FinalProject_PU
{
    [Activity(Label = "MapActivity", MainLauncher = true)]
        
    public class MapActivity : Activity, IOnMapReadyCallback, ILocationSourceOnLocationChangedListener
    {
     
        private MapFragment map1;
        Button set_location, srch_button;
        EditText srch_text;
        private GoogleMap googleMap;
        LatLng Final_Position;

        protected override void OnCreate(Bundle savedInstanceState)
        {

            base.OnCreate(savedInstanceState);

            // Create your application here

            SetContentView(Resource.Layout.Locations);
            //initializing components
            set_location = FindViewById<Button>(Resource.Id.btn_set_1);
            srch_button = FindViewById<Button>(Resource.Id.btn_srch_1);
            srch_text = FindViewById<EditText>(Resource.Id.search_text);

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            map1 = MapFragment.NewInstance();
            var ft = FragmentManager.BeginTransaction();
            ft.Add(Resource.Id.map_placeholder, map1).Commit();
            map1.GetMapAsync(this);

            //setting on click events
            set_location.Click += Set_location_Click;
            srch_button.Click += Srch_button_Click;

        }

        //search button
        private async void Srch_button_Click(object sender, EventArgs e)
        {
            Location loc = (Location)await Geocoding.GetLocationsAsync(srch_text.Text);
            LatLng latlng_src = new LatLng(loc.Latitude, loc.Longitude);
            MarkerOptions mo = new MarkerOptions();
            mo.SetPosition(latlng_src);
            mo.Draggable(true);

            googleMap.AddMarker(mo);
            CameraUpdate camup = CameraUpdateFactory.NewLatLngZoom(latlng_src, 17);
            googleMap.MoveCamera(camup);
        }

        private void Set_location_Click(object sender, EventArgs e)
        {
            try
            {
                string pos = Final_Position.Latitude.ToString() + "%%%" + Final_Position.Longitude.ToString();
                Toast.MakeText(this, pos, ToastLength.Long).Show();
            }
            catch (Exception)
            {
                Android.App.AlertDialog.Builder dialog = new AlertDialog.Builder(this);
                AlertDialog alert = dialog.Create();
                alert.SetTitle("Select Location");
                alert.SetMessage("Please select issue location by dragging pin on Issue Location");
                alert.SetButton("OK", (c, ev) =>
                {
                    alert.Dismiss();
                });
                alert.Show();
            }
            
            
        }

        public async void OnMapReady(GoogleMap mapp)
        {
            googleMap=mapp;
            googleMap.MapType = GoogleMap.MapTypeHybrid;

            var location = await Geolocation.GetLocationAsync(new GeolocationRequest
            {
                DesiredAccuracy = GeolocationAccuracy.Medium,
                Timeout = TimeSpan.FromSeconds(10)
            });

            if (location != null)
            {
                LatLng loc = new LatLng(location.Latitude, location.Longitude + 0.002);
                LatLng loc1 = new LatLng(location.Latitude, location.Longitude);

                CameraUpdate cam = CameraUpdateFactory.NewLatLngZoom(loc, 17);
                MarkerOptions m = new MarkerOptions();
                m.Draggable(true);
                m.SetPosition(loc);
                int id0 = (int)typeof(Resource.Drawable).GetField("locationpoint").GetValue(null);
                BitmapDescriptor bmd0 = BitmapDescriptorFactory.FromResource(id0);
                m.SetIcon(bmd0);


                MarkerOptions mo2 = new MarkerOptions();
                mo2.SetPosition(loc1);
                int id = (int)typeof(Resource.Drawable).GetField("locationpin").GetValue(null);
                BitmapDescriptor bmd = BitmapDescriptorFactory.FromResource(id);
                mo2.SetIcon(bmd);



                googleMap.MoveCamera(cam);
                googleMap.AddMarker(m);
                googleMap.AddMarker(mo2);
                googleMap.MarkerDragEnd += GoogleMap_MarkerDragEnd;
              
            }


    }

        private void GoogleMap_MarkerDragEnd(object sender, GoogleMap.MarkerDragEndEventArgs e)
        {
            Final_Position= e.Marker.Position;
        }

        public void OnLocationChanged(Android.Locations.Location location)
        {

            LatLng newloc = new LatLng(location.Latitude, location.Longitude);
            MarkerOptions m = new MarkerOptions();
            m.SetPosition(newloc);
            int id0 = (int)typeof(Resource.Drawable).GetField("locationpoint").GetValue(null);
            BitmapDescriptor bmd0 = BitmapDescriptorFactory.FromResource(id0);
            m.SetIcon(bmd0);
            googleMap.AddMarker(m);


        }
    }
}

我尝试将所有组件包装在相对布局中，然后将其放入框架布局中，但它不起作用。

标签： c#android-layoutandroid-fragmentsxamarin.androidandroid-edittext