最简Demo首次图表可以加载成功,但是之后重新再重新加载就一直不显示图表
KevinSkye1314 opened this issue · comments
你好,我在android运行了一个最简demo例子,首次图表能渲染出来,但是我退出debug再重启项目图标就无法再加载了,目前我使用的版本是2.4.0,
最后自己捣腾了一下,还是将图表给加载了出来,以下是具体的实现代码
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@OverRide
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
@OverRide
State createState() => _MyHomePageState();
}
class _MyHomePageState extends State {
int _counter = 0;
//申明的一个状态变量
var isReload=true;
void _incrementCounter() {
setState(() {
_counter++;
});
}
var chartDta="";
@OverRide
void initState() {
// TODO: implement initState
super.initState();
chartDta='''
{
xAxis: {
type: 'category',
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: {
type: 'value'
},
series: [{
data: [820, 932, 901, 934, 1290, 1330, 1320],
type: 'line'
}]
}
''';
}
@OverRide
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
Container(
child: Echarts(
option: chartDta,
onLoad: (p0) {//通过状态值每次进行build的时候进行一次重载
if(isReload){
p0.reload();
isReload=false;
}
},
onMessage: (message) {
},
),
width: 300,
height: 250,
)
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
由于自己是新手,不知道这种写法对性能的是否有影响,也是仅供新入手的小伙伴参考,再次感谢提供控件的大佬