Android（十九）：RadioButton 单选 Checkbox 复选框

展示

源码

<RadioGroup
    android:id="@+id/rg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <RadioButton
        android:id="@+id/rb01"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="男"
        android:checked="true" />

    <RadioButton
        android:id="@+id/rb02"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="女" />

</RadioGroup>

<CheckBox
    android:id="@+id/cb01"
    android:layout_below="@id/rg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="苹果"/>
<CheckBox
    android:id="@+id/cb02"
    android:layout_below="@id/cb01"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="橘子"/>
<CheckBox
    android:id="@+id/cb03"
    android:layout_below="@id/cb02"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="栗子"/>

using System.Collections.Generic;
using Android.App;
using Android.OS;
using Android.Widget;

namespace android_by_csharp
{
    [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);

            // 单选
            var rg = (RadioGroup)FindViewById(Resource.Id.rg);
            if (rg != null)
                rg.CheckedChange += (sender, args) =>
                {
                    var rb = (RadioButton)FindViewById(args.CheckedId);
                    Toast.MakeText(this, rb?.Text, ToastLength.Long)?.Show();
                };

            // 多选
            var choose = new List<string>();
            var cb01 = (CheckBox)FindViewById(Resource.Id.cb01);
            var cb02 = (CheckBox)FindViewById(Resource.Id.cb02);
            var cb03 = (CheckBox)FindViewById(Resource.Id.cb03);
            if (cb01 != null)
                cb01.CheckedChange += (sender, args) =>
                {
                    if (args.IsChecked)
                        choose.AddRange(new[] { cb01.Text });
                    else
                        choose.RemoveAll(value => value == cb01.Text);
                    Toast.MakeText(this, string.Join(",", choose.ToArray()), ToastLength.Long)?.Show();
                };
            if (cb02 != null) 
                cb02.CheckedChange += (sender, args) =>
                {
                    if (args.IsChecked)
                        choose.AddRange(new[] { cb02.Text });
                    else
                        choose.RemoveAll(value => value == cb02.Text);
                    Toast.MakeText(this, string.Join(",", choose.ToArray()), ToastLength.Long)?.Show();
                };
            if (cb03 != null) 
                cb03.CheckedChange += (sender, args) =>
                {
                    if (args.IsChecked)
                        choose.AddRange(new[] { cb03.Text });
                    else
                        choose.RemoveAll(value => value == cb03.Text);
                    Toast.MakeText(this, string.Join(",", choose.ToArray()), ToastLength.Long)?.Show();
                };
        }
    }
}