自定义Listview与单选按钮。我需要从多个单选按钮列表中选择一个单选按钮

Question

我有一个自定义列表视图，其中包含单选按钮和文本视图。当我选择1个单选按钮时，有多个单选按钮被选中。接下来的4个索引单选按钮也都被选择了。我想一次只选择一个单选按钮。

这是适配器代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Definition.Dto;
using static Android.Widget.CompoundButton;

namespace SGDDPortal.Android.Model
{
    public class ViewHolder : Java.Lang.Object
    {
        public TextView LabelText { get; set; }
        public RadioButton ListRadioButton { get; set; }
    }

    public class DepartmentListAdapter : BaseAdapter<DepartmentDto>, IOnCheckedChangeListener
    {
        private Activity activity;
        List<DepartmentDto> Departments;
        int selectedIndex = -1;

        public DepartmentListAdapter(Activity activity, List<DepartmentDto> Departments)
        {
            this.activity = activity;
            this.Departments = Departments;
        }

        public override DepartmentDto this[int position] => Departments[position];

        public override int Count => Departments.Count;

        public override long GetItemId(int position)
        {
            return position;
        }

        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            var view = convertView ?? activity.LayoutInflater.Inflate(Resource.Layout.DepartmentPopUpListViewRow, parent, false);
            var btnRadio = view.FindViewById<RadioButton>(Resource.Id.SelectedDepartment);
            btnRadio.SetOnCheckedChangeListener(null);
            btnRadio.Tag = position;
            btnRadio.Checked = Departments[position].Checked;
            btnRadio.Text = Departments[position].Afdeling_Txt;
            btnRadio.SetOnCheckedChangeListener(this);


            return view;
        }

        private void BtnRadio_CheckedChange(object sender, CompoundButton.CheckedChangeEventArgs e)
        {
            throw new NotImplementedException();
        }

        public void OnCheckedChanged(CompoundButton buttonView, bool isChecked)
        {
            int position = (int)buttonView.Tag;
            if (isChecked)
            {
                foreach (DepartmentDto model in Departments)
                {
                    if (model != Departments[position])
                    {
                        model.Checked = false;
                    }
                    else
                    {
                        model.Checked = true;
                    }
                }
                NotifyDataSetChanged();
            }
        }
    }
}

这是Windowpopup代码

private void DepartmentPicker_Click(object sender, EventArgs e)
        {
            //ViewModelInstances.DepartmentVieModel.PopUpCommand.CanExecute(this);
            ButtonNext.Visibility = ViewStates.Invisible;
            GetListView.ChoiceMode=ListView.ChoiceModeSingle;
            GetListView.Adapter = new DepartmentListAdapter(this, Departments);

            bool focusable = true;
            int width = 350;//LinearLayout.LayoutParams.WrapContent;
            int height = 450;//LinearLayout.LayoutParams.WrapContent;
                             // listView = _PopUpView.FindViewById<ListView>(Resource.Id.Departmentlistview);
            PopupWindow popupWindow = new PopupWindow(_PopUpView, width, height, focusable);
            popupWindow.ContentView = _PopUpView;
            popupWindow.ShowAtLocation(_PopUpView, GravityFlags.CenterVertical, 0, 0);
            popupWindow.Focusable = false;
            popupWindow.Touchable = true;
        } 

这是Xamal for WindowPopUp

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:gravity="center"
    android:descendantFocusability="blocksDescendants"  
    android:layout_height="wrap_content"
    android:background="@android:color/background_light"
    android:weightSum="100">
<LinearLayout
     android:orientation="horizontal"
     android:layout_width="match_parent"
        android:layout_weight="10"
     android:layout_height="40dp">
    <TextView
        android:text="Vælg din afdeling"
        android:textSize="20sp"
        android:textColor="#FF222222"
        android:paddingLeft="30dp"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minWidth="25px"
        android:minHeight="25px"
        android:id="@+id/textView1" />

        </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="10">
        </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_weight="50">
        <ListView
        android:minWidth="25px"
        android:minHeight="25px"
         android:choiceMode="multipleChoice"
        android:focusable="false"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/Departmentlistview" />
       </LinearLayout>
     <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_marginTop="35dp">
    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <Button
        android:id="@+id/btnAddExpense"
        android:layout_width="wrap_content"
        android:layout_height="45dp"
        android:textColor="#61222222"
        android:background="@null"
        android:text="Annuller"
        android:layout_marginLeft="20dp"
        android:layout_gravity="right"
        android:layout_marginRight="15dp" />
    <Button
        android:id="@+id/btnok"
        android:layout_width="wrap_content"
        android:layout_height="45dp"
        android:textColor="#FFF62F5E"
        android:text="Gem"
        android:background="@null"
        android:layout_marginLeft="1dp" 
        android:layout_gravity="right"
        android:layout_marginRight="15dp" />

</LinearLayout>

</LinearLayout>

包含单选按钮和文本的布局xamal，在Api调用时返回文本并与此编辑文本绑定

  <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     android:background="@android:color/background_light" 
    android:weightSum="100">
      <RadioGroup
        android:id="@+id/radioGender"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    <RadioButton    
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:checked="false"
            android:id="@+id/SelectedDepartment" /> 

    </RadioGroup>
        <TextView
            android:text="303 - Lorem ipsum"
            android:layout_weight="50"
            android:layout_marginTop="20dp"
            android:textColor="#FF222222"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:id="@+id/SelectDepartmentName" />
</LinearLayout>

此布局包含显示数据的ListView

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:gravity="center"
    android:descendantFocusability="blocksDescendants"  
    android:layout_height="wrap_content"
    android:background="@android:color/background_light"
    android:weightSum="100">
<LinearLayout
     android:orientation="horizontal"
     android:layout_width="match_parent"
        android:layout_weight="10"
     android:layout_height="40dp">
    <TextView
        android:text="Vælg din afdeling"
        android:textSize="20sp"
        android:textColor="#FF222222"
        android:paddingLeft="30dp"
        android:focusable="false"
         android:focusableInTouchMode="false"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minWidth="25px"
        android:minHeight="25px"
        android:id="@+id/textView1" />

        </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="10">
        </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_weight="50">
        <ListView
        android:minWidth="25px"
        android:minHeight="25px"
         android:choiceMode="singleChoice"
        android:focusable="false"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/Departmentlistview" />
       </LinearLayout>
     <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_marginTop="35dp">
    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <Button
        android:id="@+id/btnAddExpense"
        android:layout_width="wrap_content"
        android:layout_height="45dp"
        android:textColor="#61222222"
        android:background="@null"
        android:text="Annuller"
        android:layout_marginLeft="20dp"
        android:layout_gravity="right"
        android:layout_marginRight="15dp" />


    <Button
        android:id="@+id/btnok"
        android:layout_width="wrap_content"
        android:layout_height="45dp"
        android:textColor="#FFF62F5E"
        android:text="Gem"
        android:background="@null"
        android:layout_marginLeft="1dp" 
        android:layout_gravity="right"
        android:layout_marginRight="15dp" />

</LinearLayout>

</LinearLayout>

Answer 1

您已将单选按钮放在每个列表视图项目上，它们彼此之间没有关联，因为它们不在同一RadioGroup中。您必须在模型中定义一个属性，以指出应检查的无线电。

我模拟您的模型，例如：

public class DepartmentDto
{
    public string Afdeling_Txt { set; get; }

    public bool Checked { set; get; }
}

并且应该调整您的GetView事件：

public override View GetView(int position, View convertView, ViewGroup parent)
{
    var view = convertView ?? activity.LayoutInflater.Inflate(Resource.Layout.DepartmentPopUpListViewRow, parent, false);
    // var DepartmentpopUp = convertView ?? activity.LayoutInflater.Inflate(Resource.Layout.DepartmentPopUpListViewRow, parent, false);

    var btnRadio = view.FindViewById<RadioButton>(Resource.Id.SelectedDepartment);
    btnRadio.SetOnCheckedChangeListener(null);
    btnRadio.Tag = position;
    btnRadio.Checked = Departments[position].Checked;
    btnRadio.SetOnCheckedChangeListener(this);

    view.FindViewById<TextView>(Resource.Id.SelectDepartmentName).Text = Departments[position].Afdeling_Txt;
    return view;
}
public void OnCheckedChanged(CompoundButton buttonView, bool isChecked)
{
    int position = (int)buttonView.Tag;
    if (isChecked)
    {
        foreach (DepartmentDto model in Departments)
        {
            if (model != Departments[position])
            {
                model.Checked = false;
            }
            else
            {
                model.Checked = true;
            }
        }
        NotifyDataSetChanged();
    }
}

不要忘记在您的适配器IOnCheckedChangeListener中实现public class DepartmentListAdapter : BaseAdapter<DepartmentDto>, IOnCheckedChangeListener接口。

最后，适配器的构造函数可能是这样的：

List<DepartmentDto> list = new List<DepartmentDto>();
for (int i = 0; i<10; i++)
{
    list.Add(new DepartmentDto { Checked = false, Afdeling_Txt = "item" + i });
}

DepartmentListAdapter customAdapter = new DepartmentListAdapter(this, list);
Departmentlistview.Adapter = customAdapter;

Answer 2

现在，您的单选按钮是不同布局的一部分。由于您未使用Xamarin Forms，因此Android建议使用的方法是将所有单选按钮放在一个单选组中，如下所示。

var employeeReleasedAllocatedBonus =
            (from br in _context.BonusReleases
                join emp in _context.Employees
                    on new
                    {
                        br.EmployeeID,
                        empID = br.EmployeeID
                    } equals new
                    {
                        emp.EmployeeID,
                        empID = eid
                    }
                join job in _context.Jobs on br.JobID equals job.JobID
                join bonus in _context.Bonus
                    on new
                    {
                        br.JobID,
                        empID = br.EmployeeID
                    }
                    equals new
                    {
                        bonus.JobID,
                        empID = bonus.EmployeeID
                    }
                select new 
                {
                    AllocatedToEmployee = br.Amount
                    ,AllocatedPercentage = bonus.Amount * 100
                    ,JobNumber = job.JobNumber
                    ,JobDescription = job.JobDescription
                })
                .GroupBy(g => new {g.JobNumber, g.JobDescription, g.AllocatedPercentage})
                .Select(t => new EmployeeAllocatedReleasedBonusViewModel
                {
                JobNumber = t.Key.JobNumber,
                JobDescription = t.Key.JobDescription,
                AllocatedPercentage = t.Key.AllocatedPercentage,
                AllocatedToEmployee = t.Sum(ae => ae.AllocatedToEmployee)
                });