2020年9月起，Flutter 1.22.0:

“RaisedButton”和“FlatButton”都已弃用。

最新的解决方案是使用新的按钮:

1. ElevatedButton:

代码:

ElevatedButton(
  child: Text("ElevatedButton"),
  onPressed: () => print("it's pressed"),
  style: ElevatedButton.styleFrom(
    primary: Colors.red,
    onPrimary: Colors.white,
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(32.0),
    ),
  ),
)

别忘了，还有一个.icon构造函数可以方便地添加图标:

ElevatedButton.icon(
  icon: Icon(Icons.thumb_up),
  label: Text("Like"),
  onPressed: () => print("it's pressed"),
  style: ElevatedButton.styleFrom(
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(32.0),
    ),
  ),
)

2. OutlinedButton:

代码:

OutlinedButton.icon(
  icon: Icon(Icons.star_outline),
  label: Text("OutlinedButton"),
  onPressed: () => print("it's pressed"),
  style: ElevatedButton.styleFrom(
    side: BorderSide(width: 2.0, color: Colors.blue),
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(32.0),
    ),
  ),
)

3. TextButton:

如果你不想要轮廓或颜色填充，你总是可以使用TextButton。

更新

由于左侧按钮现在已弃用，请使用右侧按钮。

Deprecated    -->   Recommended

RaisedButton  -->   ElevatedButton
OutlineButton -->   OutlinedButton
FlatButton    -->   TextButton

ElevatedButton

Using StadiumBorder ElevatedButton( onPressed: () {}, child: Text('Button'), style: ElevatedButton.styleFrom(shape: StadiumBorder()), ) Using RoundedRectangleBorder ElevatedButton( onPressed: () {}, child: Text('Button'), style: ElevatedButton.styleFrom( shape: RoundedRectangleBorder( borderRadius: BorderRadius.circular(12), // <-- Radius ), ), ) Using CircleBorder ElevatedButton( onPressed: () {}, child: Text('Button'), style: ElevatedButton.styleFrom( shape: CircleBorder(), padding: EdgeInsets.all(24), ), ) Using BeveledRectangleBorder ElevatedButton( onPressed: () {}, child: Text('Button'), style: ElevatedButton.styleFrom( shape: BeveledRectangleBorder( borderRadius: BorderRadius.circular(12) ), ), )

OutlinedButton

Using StadiumBorder OutlinedButton( onPressed: () {}, child: Text('Button'), style: OutlinedButton.styleFrom( shape: StadiumBorder(), ), ) Using RoundedRectangleBorder OutlinedButton( onPressed: () {}, child: Text('Button'), style: OutlinedButton.styleFrom( shape: RoundedRectangleBorder( borderRadius: BorderRadius.circular(12), ), ), ) Using CircleBorder: OutlinedButton( onPressed: () {}, child: Text('Button'), style: OutlinedButton.styleFrom( shape: CircleBorder(), padding: EdgeInsets.all(24), ), ) Using BeveledRectangleBorder OutlinedButton( onPressed: () {}, child: Text('Button'), style: OutlinedButton.styleFrom( shape: BeveledRectangleBorder( borderRadius: BorderRadius.circular(12), ), ), )

TextButton

TextButton也类似于ElevatedButton和OutlinedButton，但是，你只能看到按钮按下的形状。

使用Flutter版本2，请尝试以下操作

ElevatedButton(
    style: ButtonStyle(
        shape: MaterialStateProperty.all<OutlinedBorder>(
            RoundedRectangleBorder(
                side:
                    BorderSide(width: 1.0, color: Colors.red,
                borderRadius:
                    BorderRadius.circular(5.0),),),
        backgroundColor: MaterialStateProperty.all<Color>(Colors.red),
        foregroundColor: MaterialStateProperty.all<Color>(Colors.green),
        elevation:
            MaterialStateProperty.all<double>(8.0),
        padding: MaterialStateProperty.all<EdgeInsetsGeometry>(
            const EdgeInsets.symmetric(
                horizontal: 15.0,
                vertical: 10.0),),),
    onPressed: (){},
    child: Text('Button'),)

您可以使用ElevatedButton小部件。提升的按钮小部件有一个shape属性，您可以使用该属性，如下面的代码片段所示。

ElevatedButton(
      style: ButtonStyle(
          shape: MaterialStateProperty.all<RoundedRectangleBorder>(
              RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(18.0),
                  side: BorderSide(
                      color: Colors.teal, 
                      width: 2.0,
                  ),
              ),
          ),
      ),
      child: Text('Submit'),
      onPressed: () {},
),

在容器小部件中包装一个TextButton，如下所示:

Container(
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(5),
    border: Border.all(color: Colors.black),
  ),
  child: TextButton(
    onPressed: () {
      // To do
    },
    child: Text("Go to Change Language Screen "),
  ),
)

你可以简单地使用RaisedButton或你可以使用InkWell来获得一个自定义按钮和属性，如onDoubleTap, onLongPress等:

new InkWell(
  onTap: () => print('hello'),
  child: new Container(
    //width: 100.0,
    height: 50.0,
    decoration: new BoxDecoration(
      color: Colors.blueAccent,
      border: new Border.all(color: Colors.white, width: 2.0),
      borderRadius: new BorderRadius.circular(10.0),
    ),
    child: new Center(child: new Text('Click Me', style: new TextStyle(fontSize: 18.0, color: Colors.white),),),
  ),
),

如果你想在InkWell小部件中使用splashColor和highlightColor属性，使用Material小部件作为InkWell小部件的父部件，而不是装饰容器(删除装饰属性)。在这里阅读原因。