在 Flutter 中定位两个浮动操作按钮
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【中文标题】在 Flutter 中定位两个浮动操作按钮【英文标题】:Position two floating action button in Flutter 【发布时间】:2020-09-23 08:12:44 【问题描述】:如何在 Flutter 中定位多个浮动操作按钮。特别是我需要屏幕右下角的一个按钮和左上角的另一个按钮。
【问题讨论】:
您可以尝试将 FAB 放入 Stack 并在那里对齐 【参考方案1】:使用 Column 并在其中添加两个浮动按钮,一个在左上角,第二个在右下角
Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Align(
alignment: Alignment.topLeft,
child: FloatingActionButton(
tooltip: 'Increment',
child: Icon(Icons.add),
),
),
Expanded(
child: Align(
alignment: Alignment.bottomRight,
child: FloatingActionButton(
tooltip: 'Increment',
child: Icon(Icons.add),
),
),
)
],
),
【讨论】:
@GenchiGenbutsu:不确定他的要求, 我想将这些按钮放在 GoogleMap 小部件的顶部,我应该在哪里添加地图小部件?【参考方案2】:您可以使用带有 positioned() 的 stack() 小部件来实现此目的,例如:
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
void main()
runApp(MyApp());
class MyApp extends StatelessWidget
// This widget is the root of your application.
@override
Widget build(BuildContext context)
return MaterialApp(
title: 'Maps and Floating Buttons Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Maps and Floating Buttons Demo'),
);
class MyHomePage extends StatefulWidget
MyHomePage(Key key, this.title) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
class _MyHomePageState extends State<MyHomePage>
GoogleMapController mapController;
var initialLocation =
CameraPosition(target: LatLng(-27.56, -58.58), zoom: 12);
void mapControllerCreated(GoogleMapController controller)
mapController = controller;
@override
Widget build(BuildContext context)
return Scaffold(
body: Stack(children: <Widget>[
GoogleMap(
zoomControlsEnabled: false,
zoomGesturesEnabled: true,
mapToolbarEnabled: true,
compassEnabled: false,
myLocationButtonEnabled: true,
initialCameraPosition: initialLocation,
onMapCreated: mapControllerCreated,
onCameraMove: (position) ,
onCameraIdle: () ,
),
Positioned(
top: 50,
right: 20,
child: FloatingActionButton(
child: Icon(Icons.textsms_sharp),
backgroundColor: Colors.blue,
heroTag: 1,
onPressed: ()
//do something on press
,
)),
Positioned(
top: 50,
left: 20,
child: FloatingActionButton(
child: Icon(Icons.check),
backgroundColor: Colors.blue,
heroTag: 1,
onPressed: ()
//do something on press
,
)),
Positioned(
bottom: 50,
left: 20,
child: FloatingActionButton(
child: Icon(Icons.search),
backgroundColor: Colors.blue,
heroTag: 1,
onPressed: ()
//do something on press
,
),
)
]),
);
这里是截图:
【讨论】:
【参考方案3】:检查以下代码和屏幕截图可能会对您有所帮助:
@override
Widget build(BuildContext context)
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(
children: <Widget>[
Expanded(
child: Container(
width: MediaQuery.of(context).size.width,
color: Colors.red,
child: Align(
alignment: Alignment.topLeft,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
FloatingActionButton(onPressed: (),child: Icon(Icons.add),),
],
),
),
)
),
Expanded(child: Container(
width: MediaQuery.of(context).size.width,
color: Colors.green,
child: Text('Center',textAlign: TextAlign.center,)
)),
Expanded(
child: Container(
width: MediaQuery.of(context).size.width,
color: Colors.red,
child: Align(
alignment: Alignment.bottomRight,
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FloatingActionButton(onPressed: (),child: Icon(Icons.add),),
],
),
),
)
),
],
),
);
【讨论】:
我想将这些按钮放在 GoogleMap 小部件的顶部,我应该在哪里添加地图小部件? @pz7 而不是 Column 使用 Stack[ Align( alignment: Alignment.topLeft, child: FloatingActionButton(onPressed: (),child: Icon(Icons.add),), ), GoogleMap( mapType: MapType.hybrid, initialCameraPosition: _kGooglePlex, onMapCreated: (GoogleMapController controller) _controller.complete(controller); , ), Align(alignment: Alignment.bottomRight, child: FloatingActionButton(onPressed: (),child: Icon (Icons.add),), ) ]以上是关于在 Flutter 中定位两个浮动操作按钮的主要内容,如果未能解决你的问题,请参考以下文章
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