Flutter 在按下按钮时更改按钮的背景颜色和文本颜色,并在未按下按钮时将其设置回默认值

Flutter 在按下按钮时更改按钮的背景颜色和文本颜色,并在未按下按钮时将其设置回默认值,flutter,dart,flutter-layout,Flutter,Dart,Flutter Layout,我是个新手。我有两个按钮在一行,我想改变颜色和文字的第一个按钮时,它被按下的其他东西,如果第二个按钮被按下,第一个按钮应该回到默认的颜色和第二个按钮应该去新的颜色。有没有办法通过索引来实现这一点 Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, mainAxisSize: MainAxisSize.max, cros

我是个新手。我有两个按钮在一行,我想改变颜色和文字的第一个按钮时,它被按下的其他东西,如果第二个按钮被按下,第一个按钮应该回到默认的颜色和第二个按钮应该去新的颜色。有没有办法通过索引来实现这一点

 Row(
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                    mainAxisSize: MainAxisSize.max,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: [
                      SizedBox(
                        height: 150,
                          width: MediaQuery.of(context).size.width * 0.45,

                        child: RaisedButton(
                          color: primaryColor,
                          onPressed: () {},
                          child: Padding(
                            padding: const EdgeInsets.only(top: 20.0),
                            child: Column(
                              children: [
                                Text('Stunning Solo', style: TextStyle(fontSize: 15,color: Colors.white)),
                                Text('Current Plan', style: TextStyle(fontSize: 12,color: Colors.white)),
                                Padding(
                                  padding: const EdgeInsets.all(8.0),
                                  child: Text("\$$dollars3",style: TextStyle(fontSize: 20,color: Colors.white)),
                                ),
                                Text(
                                  "Free forever",
                                  style: TextStyle(
                                      fontWeight: FontWeight.bold,
                                      fontSize: 13,
                                      color: whiteColor),
                                ),

                              ],
                            ),
                          ),
                        ),
                      ),

                      SizedBox(height: 20),

                      SizedBox(
                        height: 150,
                        width: MediaQuery.of(context).size.width * 0.45,

                        child: RaisedButton(
                          color: primaryColor,
                          onPressed:
                              () {},

                          child: Column(
                            children: [
                              Padding(
                                padding: const EdgeInsets.only(top: 20.0),
                                child: Text('Startup Pack', style: TextStyle(fontSize: 15,color: Colors.white)),
                              ),
                              Text('Introductory Offer', style: TextStyle(fontSize: 12,color: Colors.white)),
                              Padding(
                                padding: const EdgeInsets.all(10.0),
                                child: Row(
                                    mainAxisAlignment: MainAxisAlignment.center,
                                    mainAxisSize: MainAxisSize.max,
                                    crossAxisAlignment: CrossAxisAlignment.center,
                                    children: <Widget>[

                                      Text(
                                        "\$$dollars",
                                        style: TextStyle(
                                            fontWeight: FontWeight.bold,
                                            fontSize: 20,
                                            decoration: TextDecoration.lineThrough),
                                      ),
                                      SizedBox(width: 5),
                                      Text(
                                        "\$$dollars2",
                                        style: TextStyle(
                                            fontWeight: FontWeight.bold,
                                            fontSize: 20,
                                            color: whiteColor),
                                      ),
                                    ]),
行(
mainAxisAlignment:mainAxisAlignment.space,
mainAxisSize:mainAxisSize.max,
crossAxisAlignment:crossAxisAlignment.center,
儿童:[
大小盒子(
身高:150,
宽度:MediaQuery.of(context).size.width*0.45,
孩子:升起按钮(
颜色:原色,
按下:(){},
孩子:填充(
填充:仅限常量边集(顶部:20.0),
子:列(
儿童:[
文本(“绝妙独奏”,样式:TextStyle(字体大小:15,颜色:Colors.white)),
文本(“当前计划”,样式:TextStyle(字体大小:12,颜色:Colors.white)),
填充物(
填充:常数边集全部(8.0),
子项:文本(“\$$dollars3”,样式:TextStyle(fontSize:20,颜色:Colors.white)),
),
正文(
“永远自由”,
样式:TextStyle(
fontWeight:fontWeight.bold,
尺寸:13,
颜色:白色),
),
],
),
),
),
),
尺寸箱(高度:20),
大小盒子(
身高:150,
宽度:MediaQuery.of(context).size.width*0.45,
孩子:升起按钮(
颜色:原色,
按下按钮:
() {},
子:列(
儿童:[
填充物(
填充:仅限常量边集(顶部:20.0),
子项:文本('Startup Pack',样式:TextStyle(fontSize:15,颜色:Colors.white)),
),
Text('介绍性报价',样式:TextStyle(字体大小:12,颜色:Colors.white)),
填充物(
填充:常数边集全部(10.0),
孩子:排(
mainAxisAlignment:mainAxisAlignment.center,
mainAxisSize:mainAxisSize.max,
crossAxisAlignment:crossAxisAlignment.center,
儿童:[
正文(
“\$$美元”,
样式:TextStyle(
fontWeight:fontWeight.bold,
尺寸:20,
装饰:文本装饰。线条贯穿),
),
尺寸箱(宽度:5),
正文(
“\$$dollars2”,
样式:TextStyle(
fontWeight:fontWeight.bold,
尺寸:20,
颜色:白色),
),
]),

您可以为此使用
切换按钮

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  List<bool> buttonsState = [
    true,
    false
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(

        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: ToggleButtons(
          highlightColor: Colors.transparent,
          splashColor: Colors.transparent,
          color: Colors.blue,
          fillColor: Colors.blue,
          isSelected: buttonsState,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.only(
                left: 8,
                right:8,
              ),
              child: Text(
                "Free forever", style: _getTextStyle(0),
                textAlign: TextAlign.center,
              ),
            ),
            Padding(
              padding: EdgeInsets.only(
                left: 8,
                right: 8,
              ),
              child: Text(
                "Startup Pack", style: _getTextStyle(1),
                textAlign: TextAlign.center,
              ),
            ),
          ],
          onPressed: _updateButtonState,
          borderRadius: BorderRadius.all(Radius.circular(8.0)),
        ),
      ),
    );
  }

  _updateButtonState(int index) {
    setState(() {
      for (int buttonIndex = 0; buttonIndex < buttonsState.length; buttonIndex++) {
        if (buttonIndex == index) {
          buttonsState[buttonIndex] = true;
        } else {
          buttonsState[buttonIndex] = false;
        }
      }
    });
  }

  TextStyle _getTextStyle(int index) {
    return buttonsState[index]
        ? TextStyle(
        fontWeight: FontWeight.bold,
        fontSize: 20,
        color: Colors.white) : TextStyle(
        fontWeight: FontWeight.bold,
        fontSize: 20,
        color: Colors.blue);
  }
}
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
列表按钮状态=[
是的,
假的
];
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中(
//中心是一个布局小部件。它接受一个子元素并对其进行定位
/在父母的中间。
子:切换按钮(
highlightColor:Colors.transparent,
splashColor:Colors.transparent,
颜色:颜色,蓝色,
fillColor:Colors.blue,
当选:按钮状态,
儿童:[
填充物(
填充:仅限边缘设置(
左:8,,
右:8,,
),
子:文本(
“永远自由”,风格:_getTextStyle(0),
textAlign:textAlign.center,
),
),
填充物(
填充:仅限边缘设置(
左:8,,
右:8,,
),
中国