[系统运维]HarmonyOS开发38：RadioButton单选框基本用法

组件说明：

父类是AbsButton，而AbsButton的父类是Button。在使用的时候需要用到单选按钮的按钮组。
RadioContainer，在一组内多选按钮只能选择其中一个。

当需要监听单选框的状态时，不要用AbsButton里面的CheckedStateChangedListener。而是给按钮组
RadioContainer添加事件。用RadioContainer里面的CheckedStateChangedListener。

常见属性：

常见方法:

按钮组RadioContainer常见方法：

同上篇文章讲到的一样，本篇文章也需要用到面写的吐司弹框，记得提前加入到项目当中

ability_main.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <RadioContainer
        ohos:id="$+id:rc"
        ohos:height="match_content"
        ohos:width="match_content">

        <RadioButton
            ohos:id="$+id:boy"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="#21A8FD"
            ohos:text="男"
            ohos:text_alignment="center"
            ohos:text_size="30fp"/>

        <RadioButton
            ohos:id="$+id:girl"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="#21A8FD"
            ohos:text="女"
            ohos:text_alignment="center"
            ohos:text_size="30fp"
            ohos:top_margin="10vp"/>

    </RadioContainer>

<!--    <RadioContainer
        ohos:height="match_content"
        ohos:width="match_content">

        <RadioButton
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="#21A8FD"
            ohos:text="篮球"
            ohos:text_alignment="center"
            ohos:text_size="30fp"
            ohos:top_margin="10vp"/>

        <RadioButton
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="#21A8FD"
            ohos:text="足球"
            ohos:text_alignment="center"
            ohos:text_size="30fp"
            ohos:top_margin="10vp"/>

        <RadioButton
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="#21A8FD"
            ohos:text="排球"
            ohos:text_alignment="center"
            ohos:text_size="30fp"
            ohos:top_margin="10vp"/>

    </RadioContainer>-->

</DirectionalLayout>

MainAbilitySlice.java代码：

package com.example.radiobuttonapplication.slice;

import com.example.radiobuttonapplication.ResourceTable;
import com.example.radiobuttonapplication.toastUtils.ToastUtils;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.RadioButton;
import ohos.agp.components.RadioContainer;

public class MainAbilitySlice extends AbilitySlice implements RadioContainer.CheckedStateChangedListener {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        //1.找到组件
        RadioButton boy = (RadioButton) findComponentById(ResourceTable.Id_boy);
        RadioButton girl = (RadioButton) findComponentById(ResourceTable.Id_girl);
        RadioContainer rc = (RadioContainer) findComponentById(ResourceTable.Id_rc);

        //boy.setChecked(true);
        //boy.setCheckedStateChangedListener(this);

        rc.setMarkChangedListener(this);
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }

    //参数一：单选框按钮组的对象
    //参数二：索引，表示按钮组中第i个按钮
    @Override
    public void onCheckedChanged(RadioContainer radioContainer, int i) {
        RadioButton rb = (RadioButton) radioContainer.getComponentAt(i);
        String text = rb.getText();
        if (rb.isChecked()) {
            ToastUtils.showDialog(this, text + "被选中了");
        } else {
            ToastUtils.showDialog(this, text + "被取消选中了");
        }
    }
}

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