我目前正在Flutter开发一个Android应用程序。我如何添加一个圆形按钮?
当前回答
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。
其他回答
Container(
width: yourWidth,
height: yourHeight ,
decoration: BoxDecoration(
borderRadius: radius,
gradient: yourGradient,
border: yourBorder),
child: FlatButton(
onPressed: {} (),
shape: RoundedRectangleBorder(borderRadius: radius),
.......
用同样的半径。
如果你使用材质应用程序作为你的主小部件,你总是可以使用材质按钮。
Padding(
padding: EdgeInsets.symmetric(vertical: 16.0),
child: Material(
borderRadius: BorderRadius.circular(30.0),//Set this up for rounding corners.
shadowColor: Colors.lightBlueAccent.shade100,
child: MaterialButton(
minWidth: 200.0,
height: 42.0,
onPressed: (){//Actions here//},
color: Colors.lightBlueAccent,
child: Text('Log in', style: TextStyle(color: Colors.white),),
),
),
)
addButton() {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.symmetric(vertical: 10.0),
child: SizedBox(
height: 45,
width: 200,
child: ElevatedButton.icon(
onPressed: () async {},
style: ButtonStyle(
shape: MaterialStateProperty.all<RoundedRectangleBorder>(
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(30.0),
)),
elevation: MaterialStateProperty.all(1),
backgroundColor: MaterialStateProperty.all(Colors.blue),
),
icon: Icon(Icons.add, size: 18),
label: Text("Add question"),
),
),
),
],
);
}
圆边颜色容器:
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
border: Border.all(color: Colors.red),
),
child: Text("Some Text"),
)
您可以使用下面的代码创建一个渐变颜色的圆形按钮。
Container(
width: 130.0,
height: 43.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30.0),
gradient: LinearGradient(
// Where the linear gradient begins and ends
begin: Alignment.topRight,
end: Alignment.bottomLeft,
// Add one stop for each color. Stops should increase from 0 to 1
stops: [0.1, 0.9],
colors: [
// Colors are easy thanks to Flutter's Colors class.
Color(0xff1d83ab),
Color(0xff0cbab8),
],
),
),
child: FlatButton(
child: Text(
'Sign In',
style: TextStyle(
fontSize: 16.0,
fontFamily: 'Righteous',
fontWeight: FontWeight.w600,
),
),
textColor: Colors.white,
color: Colors.transparent,
shape:
RoundedRectangleBorder(borderRadius: BorderRadius.circular(30.0)),
onPressed: () {
},
),
);