[Android] Chapter 5 (4) Radio selection and check selection

Category: C#, Android, VS2015; Creation date: 2016-02-07 1. Introduction 1. CheckBox [Checked] attribute: whether to check or not. 2. RadioButton radio button [Checked] attribute: whether to check. [RadioGroup] attribute: RadioButton’s group container. Note that the RadioButton must be included in the RadioGroup. 2

Category: C#, Android, VS2015;

Creation date: 2016-02-07

1. Introduction

1. CheckBox

Check

[Checked] attribute: whether to check.

2. RadioButton

Single choice

[Checked] attribute: whether to check.

[RadioGroup] attribute: RadioButton’s group container. Note that the RadioButton must be included in the RadioGroup.

2. Example 4—Demo04CheckBoxRadioButton

1. Running screenshots

2. Add demo04_CheckBoxRadioButton.axml file

Add this file under the layout folder.

Drag and drop 2 [CheckBox] controls and 1 [RadioGroup] control from the [Toolbox] to the design interface, and then modify them directly in the [Source] to the following content:

<span style="color: #0000ff;"></span><span style="color: #ff00ff;">xml version="1.0" encoding="utf-8"</span><span style="color: #0000ff;">?></span>
<span style="color: #0000ff;"><span style="color: #800000;">LinearLayout </span><span style="color: #ff0000;">xmlns:android</span><span style="color: #0000ff;">="http://schemas.android.com/apk/res/android"</span><span style="color: #ff0000;">
    android:orientation</span><span style="color: #0000ff;">="vertical"</span><span style="color: #ff0000;">
    android:layout_width</span><span style="color: #0000ff;">="match_parent"</span><span style="color: #ff0000;">
    android:layout_height</span><span style="color: #0000ff;">="match_parent"</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">CheckBox
        </span><span style="color: #ff0000;">android:text</span><span style="color: #0000ff;">="红色"</span><span style="color: #ff0000;">
        android:layout_width</span><span style="color: #0000ff;">="match_parent"</span><span style="color: #ff0000;">
        android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
        android:id</span><span style="color: #0000ff;">="@+id/checkBoxRed"</span> <span style="color: #0000ff;">/></span>
    <span style="color: #0000ff;"><span style="color: #800000;">CheckBox
        </span><span style="color: #ff0000;">android:text</span><span style="color: #0000ff;">="绿色"</span><span style="color: #ff0000;">
        android:layout_width</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
        android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
        android:id</span><span style="color: #0000ff;">="@+id/checkBoxGreen"</span> <span style="color: #0000ff;">/></span>
    <span style="color: #0000ff;"><span style="color: #800000;">RadioGroup
        </span><span style="color: #ff0000;">android:minWidth</span><span style="color: #0000ff;">="25px"</span><span style="color: #ff0000;">
        android:minHeight</span><span style="color: #0000ff;">="25px"</span><span style="color: #ff0000;">
        android:layout_width</span><span style="color: #0000ff;">="match_parent"</span><span style="color: #ff0000;">
        android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
        android:id</span><span style="color: #0000ff;">="@+id/radioGroupGander"</span><span style="color: #0000ff;">></span>
        <span style="color: #0000ff;"><span style="color: #800000;">RadioButton
            </span><span style="color: #ff0000;">android:layout_width</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
            android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
            android:checked</span><span style="color: #0000ff;">="true"</span><span style="color: #ff0000;">
            android:text</span><span style="color: #0000ff;">="男"</span><span style="color: #ff0000;">
            android:id</span><span style="color: #0000ff;">="@+id/radioButtonMale"</span> <span style="color: #0000ff;">/></span>
        <span style="color: #0000ff;"><span style="color: #800000;">RadioButton
            </span><span style="color: #ff0000;">android:layout_width</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
            android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
            android:text</span><span style="color: #0000ff;">="女"</span><span style="color: #ff0000;">
            android:id</span><span style="color: #0000ff;">="@+id/radioButtonFamale"</span> <span style="color: #0000ff;">/></span>
    <span style="color: #0000ff;"></span><span style="color: #800000;">RadioGroup</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">Button
        </span><span style="color: #ff0000;">android:id</span><span style="color: #0000ff;">="@+id/btnOK"</span><span style="color: #ff0000;">
        android:layout_width</span><span style="color: #0000ff;">="fill_parent"</span><span style="color: #ff0000;">
        android:layout_height</span><span style="color: #0000ff;">="wrap_content"</span><span style="color: #ff0000;">
        android:text</span><span style="color: #0000ff;">="确定"</span> <span style="color: #0000ff;">/></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">LinearLayout</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span>

3. Add the Demo04CheckBoxRadioButton.cs file

Add this file under the SrcActivity folder.

<span style="color: #0000ff;">using</span><span style="color: #000000;"> System;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.App;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.OS;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Widget;

</span><span style="color: #0000ff;">namespace</span><span style="color: #000000;"> ch05demos.SrcActivity
{
    [Activity(Label </span>= <span style="color: #800000;">"</span><span style="color: #800000;">CheckBoxRadioButtonDemo</span><span style="color: #800000;">"</span><span style="color: #000000;">)]
    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Demo04CheckBoxRadioButton : Activity
    {
        CheckBox red, green;
        RadioButton nan, nv;

        </span><span style="color: #0000ff;">PRotected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnCreate(Bundle savedInstanceState)
        {
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.demo04_CheckBoxRadioButton);

            red </span>= FindViewById<checkbox><span style="color: #000000;">(Resource.Id.checkBoxRed);
            green </span>= FindViewById<checkbox><span style="color: #000000;">(Resource.Id.checkBoxGreen);
            nan </span>= FindViewById<radiobutton><span style="color: #000000;">(Resource.Id.radioButtonMale);
            nv </span>= FindViewById<radiobutton><span style="color: #000000;">(Resource.Id.radioButtonFamale);

            </span><span style="color: #0000ff;">var</span> button = FindViewById<button><span style="color: #000000;">(Resource.Id.btnOK);
            button.Click </span>+=<span style="color: #000000;"> Button_Click;
        }

        </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">void</span> Button_Click(<span style="color: #0000ff;">object</span><span style="color: #000000;"> sender, EventArgs e)
        {
            </span><span style="color: #0000ff;">string</span> s1 = <span style="color: #800000;">"</span><span style="color: #800000;">性别：</span><span style="color: #800000;">"</span> + (nan.Checked ? <span style="color: #800000;">"</span><span style="color: #800000;">男</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">女</span><span style="color: #800000;">"</span><span style="color: #000000;">);
            </span><span style="color: #0000ff;">string</span> s2 = <span style="color: #800000;">"</span><span style="color: #800000;">喜欢的颜色：</span><span style="color: #800000;">"</span><span style="color: #000000;">;
            </span><span style="color: #0000ff;">if</span> (red.Checked) s2 +=<span style="color: #000000;"> red.Text;
            </span><span style="color: #0000ff;">if</span> (green.Checked) s2 += <span style="color: #800000;">"</span> <span style="color: #800000;">"</span> +<span style="color: #000000;"> green.Text;
            Toast.MakeText(</span><span style="color: #0000ff;">this</span><span style="color: #000000;">,
                </span><span style="color: #0000ff;">string</span>.Format(<span style="color: #800000;">"</span><span style="color: #800000;">{0}\n{1}</span><span style="color: #800000;">"</span><span style="color: #000000;">, s1, s2),
                ToastLength.Long).Show();
        }
    }
}</span></button></radiobutton></radiobutton></checkbox></checkbox>

Run this example to observe the effect.

Tip: The status of RadioButton can be changed through the [Checked] attribute or the Toggle() method.