2 days ago, I asked the solution of my problem in this post and got answer to make another statefulwidget and use http codes. So my code became :
class _post_openState extends State<post_open> {
void initState() {
super.initState();
// Enable virtual display.
if (Platform.isAndroid) WebView.platform = AndroidWebView();
// else if(Platform.isIOS)WebView.platform =
}
@override
Future <String> _scrap_title(url_received) async
{
var elements;
url_received = url_received.split(' ')[-1];
if (url_received.split(':')[0] !='https')
url_received = 'https://' url_received;
print('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%');
print(url_received);
bool suc = false;
// Future.delayed(Duration.zero,() async {
print('response init');
if (url_received == '' || url_received == ' ') return 'No reference';
final url = Uri.parse(url_received);
print('response parsed');
final resp = await http.get(url);
print('response on');
print(resp.statusCode);
if (resp.statusCode == 200) {
dom.Document doc = parser.parse(resp.body);
elements = doc.querySelector('title');
suc = true;
}
//}
//);
return Future.value(elements!.text);
}
Widget build(BuildContext context){
String reference = widget.data_received[5];
bool leftright = widget.data_received[0];
String content = widget.data_received[1];
String writer = widget.data_received[2];
int like = widget.data_received[3];
int shared = widget.data_received[4];
print(widget.data_received);
print('**************************************');
void Function()? _showWeb(String title, String url)
{
showDialog(
context: context,
builder: (context) {
return Container(
height: MediaQuery.of(context).size.height*0.9,
width: MediaQuery.of(context).size.width*0.95,
padding: EdgeInsets.symmetric(horizontal: 3),
//
child:
Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0)
), //this right here
child:
Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Padding(padding: EdgeInsets.symmetric(vertical: 10)),
Text(title),
Padding(padding: EdgeInsets.symmetric(vertical: 3)),
Container(height:2,color:Colors.brown),
Container(
height: MediaQuery.of(context).size.height*0.7,
width: MediaQuery.of(context).size.width*0.9,
padding: EdgeInsets.symmetric(horizontal: 5),
child:
Expanded(
child:WebView(
initialUrl: url,
javascriptMode: JavascriptMode.unrestricted,
),
),
),
Container(height:2,color:Colors.brown),
Padding(padding: EdgeInsets.symmetric(vertical: 3)),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
TextButton.icon(onPressed: (){
setState(){
};
}, icon:Icon(Icons.thumb_up_alt_outlined),label: Text('like'),style: TextButton.styleFrom(primary: Colors.brown)),
GestureDetector(
onTap: (){
Navigator.pop(context);
},
child:Container
(
width: MediaQuery.of(context).size.width*0.4,
height: 30,
color:Colors.amber,
child:Text('Back',style: TextStyle(fontSize:20,color: Colors.white),
textAlign: TextAlign.center,)
),
),
TextButton(onPressed: (){
setState(){
};
}, child: Icon(Icons.share),style: TextButton.styleFrom(primary: Colors.brown)),
],
),
],
)
)
);
});
}
return
Scaffold(
resizeToAvoidBottomInset: true,
appBar: AppBar(
backgroundColor: Colors.white,
toolbarHeight: 1.0,
),
body:
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 40,
width: 40,
child:
TextButton(onPressed: () {
Navigator.pop(context);
},
style: TextButton.styleFrom(primary: Colors.brown,),
child: Icon(Icons.arrow_back)
),
),
),
Padding(padding: EdgeInsets.symmetric(vertical: 5)),
FutureBuilder<String>(
future: _scrap_title(reference),
builder: (BuildContext context, AsyncSnapshot snapshot){
print('snapshot status' snapshot.hasData.toString());
if (snapshot.hasData == false) {
return CircularProgressIndicator();
}
else
return GestureDetector(onTap: (){
_showWeb(writer, reference);
},
child:Text(snapshot.data,style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),),
);
}),
Padding(padding: EdgeInsets.symmetric(vertical: 5)),
Container(
height:1,
color: Colors.brown,
),
Padding(padding: EdgeInsets.symmetric(vertical: 5)),
Text(content,style: TextStyle(color:Colors.black87,fontSize: 15)),
]
)
);
}
}
But strangely, testing by print told me that this class does not even call _scrap_title.
I am having confusion of understanding lifecysle of widget/future/async and so on. Why do I keep failing to scrap html title of a web ? PLEASE somebody give me solution. Thank you so much.
CodePudding user response：
Can you try replacing @override
///@override remove it
Future <String> _scrap_title(url_received) async
{....}
@override //add it here
Widget build(BuildContext context){
also better practice put variable outside the build method, you can use initState or use late
late String reference = widget.data_received[5];
late bool leftright = widget.data_received[0];
....
@override
Widget build(BuildContext context){
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