I am trying to refresh the list of recipes after i delete one item and i have tried using SetState but I've got no result. I think the issue is that i get to this screen after making a GET call and that call is not executed again after deleting the item. What can I do?
void _pushRecipesByTypeScreen(String type) async {
var recipes = await entityApi.getRecipesByType(type);
Navigator.of(context).push(new MaterialPageRoute(builder: (context) {
return new Scaffold(
appBar: new AppBar(title: new Text(type)),
body: ListView.builder(
itemCount: recipes.length,
itemBuilder: (context, index) {
final item = recipes[index];
return _buildEntityItem2(item);
})
);
}));
}
Widget _buildEntityItem2(Entity entity) {
return ListTile(
title: Text(entity.name),
onTap: () => _pushDeleteScreen(entity),
);
}
void _pushDeleteScreen(Entity entity) {
showDialog(
context: context,
builder: (BuildContext context) {
return new AlertDialog(
title: new Text('Delete "${entity.name}"?'),
actions: <Widget>[
new FlatButton(
child: new Text('CANCEL'),
onPressed: () => Navigator.of(context).pop()),
new FlatButton(
child: new Text('CONFIRM'),
onPressed: () {
_removeEntityItem(entity);
setState(() {});
Navigator.of(context).pop();
})
]);
});
}
void _removeEntityItem(Entity entity) async {
if (await connectivity.checkConnectivity() != ConnectivityResult.none) {
bool success = await entityApi.deleteEntity(entity);
if (success) {
setState(() {});
}
}
}
The setstate should be used outside of dialog for it to reload your listview
void _pushRecipesByTypeScreen(String type) async {
var recipes = await entityApi.getRecipesByType(type);
Navigator.of(context).push(new MaterialPageRoute(builder: (context) {
return new Scaffold(
appBar: new AppBar(title: new Text(type)),
body: ListView.builder(
itemCount: recipes.length,
itemBuilder: (context, index) {
final item = recipes[index];
return _buildEntityItem2(item);
})
);
}));
}
Widget _buildEntityItem2(Entity entity) {
return ListTile(
title: Text(entity.name),
onTap: () async {
if(await _pushDeleteScreen(entity)) {
await _removeEntityItem(entity); //await until this completes
setState(() {});
}
}
);
}
Future<bool> _pushDeleteScreen(Entity entity) {
return showDialog(
context: context,
builder: (BuildContext context) {
return new AlertDialog(
title: new Text('Delete "${entity.name}"?'),
actions: <Widget>[
new FlatButton(
child: new Text('CANCEL'),
onPressed: () => Navigator.of(context).pop(false)),
new FlatButton(
child: new Text('CONFIRM'),
onPressed: () {
Navigator.of(context).pop(true);
})
]);
});
}
// make this return future
Future<void> _removeEntityItem(Entity entity) async {
if (await connectivity.checkConnectivity() != ConnectivityResult.none) {
bool success = await entityApi.deleteEntity(entity);
if (success) {
setState(() {});
}
}
}
Related
I want to show a What's New style AlertDialog to inform users what has changed in my app after updating. I've created the following function to see if the app has been updated:
Future<bool> checkNewVersion() async {
PackageInfo packageInfo = await PackageInfo.fromPlatform();
String appVersion = packageInfo.version;
SharedPreferences prefs = await SharedPreferences.getInstance();
final String? currVersion = prefs.getString("version");
print("App version: $appVersion");
print("Current version: $currVersion");
if (currVersion == null) {
await prefs.setString("version", appVersion);
return true;
}
if (currVersion != appVersion) return true;
return false;
}
When this function is called in the build method below, the print statements output the following, but the alert dialog is not shown:
flutter: App version: 2.0
flutter: Current version: null
#override
Widget build(BuildContext context) {
if (checkNewVersion() == true) {
showDialog(context: context, builder: (_) =>
AlertDialog(
title: const Text("What's New / Que ha Cambiado"),
content: Text(updateInfo),
actions: <Widget>[
TextButton(
child: const Text("OK"),
onPressed: () {
Navigator.of(context).pop();
},
)
],
));
}
return Scaffold(
// app main menu
...
);
}
You are Performing an async operation to get the result. So when performing an async function that returns some Future you must await for it otherwise it will return you an incomplete future.
So when calling checkNewVersion()
You should await for its result like
var versionResult = await checkNewVersion();
Your code will be like
#override
Widget build(BuildContext context) {
var versionResult = await checkNewVersion();
if (versionResult) {
showDialog(context: context, builder: (_) =>
AlertDialog(
title: const Text("What's New / Que ha Cambiado"),
content: Text(updateInfo),
actions: <Widget>[
TextButton(
child: const Text("OK"),
onPressed: () {
Navigator.of(context).pop();
},
)
],
));
}
return Scaffold(
// app main menu
...
);
}
your checkNewVersion is an async function so you have to wait for its result, Try this:
#override
Widget build(BuildContext context) {
bool result = await checkNewVersion();
if (result) {
showDialog(context: context, builder: (_) =>
AlertDialog(
title: const Text("What's New / Que ha Cambiado"),
content: Text(updateInfo),
actions: <Widget>[
TextButton(
child: const Text("OK"),
onPressed: () {
Navigator.of(context).pop();
},
)
],
));
}
return Scaffold(
// app main menu
...
);
}
I have an alertdialog which is supposed to return a bool depending on the user's choice, the message gets removed, but the back button isn't working!
Future<bool?> showwarning(BuildContext context) async {
showDialog<bool>(
context: context,
builder: (context) => AlertDialog(
title: new Text("Alert!!"),
content: new Text("Return To Main Page?!"),
actions: [
TextButton(
child: new Text("Yes"),
onPressed: () {
Navigator.pop(context, true);
},
),
TextButton(
child: new Text("Nope"),
onPressed: () {
Navigator.pop(context, false);
},
)
],
));
}
Widget build(BuildContext context) {
// TODO: implement build
return WillPopScope(
onWillPop: () async {
final user_decision = await showwarning(context);
return user_decision ?? false;
},
Future<bool?> showwarning(BuildContext context) async {
return showDialog<bool>(
context: context,
builder: (context) => AlertDialog(
title: new Text("Alert!!"),
content: new Text("Return To Main Page?!"),
actions: [
TextButton(
child: new Text("Yes"),
onPressed: () {
Navigator.pop(context, true);
},
),
TextButton(
child: new Text("Nope"),
onPressed: () {
Navigator.pop(context, false);
},
)
],
));
}
Widget build(BuildContext context) {
// TODO: implement build
return WillPopScope(
onWillPop: () async {
final user_decision = await showwarning(context);
return user_decision ?? false;
},
The problem is that I wasn't returning anything from showwarning function , hence, it was always false!
I am trying to get the location permissions and I want to display a message before requesting the permission. but when I run the APP it doesn't wait until I close the showdialog
Future<void> checkPermission() async {
var status = await Permission.location.status;
print(status.toString());
if (status.isUndetermined) {
await showAlertPopup(context, '',
'OK')
.then((val) {
var statuses = Permission.location.request();
print(statuses);
});
}
if (status.isDenied ||
status.isPermanentlyDenied ||
status.isRestricted ||
status.isUndetermined) {
await showAlertPopup(context, '',
'error')
.then((val) {
openAppSettings();
});
}
if (status.isGranted) {
_geoAlowed = true;
}
}
and this is my code to display the popup
showAlertPopup(BuildContext context, String title, String detail) async {
showDemoDialog({BuildContext context, Widget child}) async {
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return child;
});
}
return showDemoDialog(
context: context,
child: AlertDialog(
title: Text(title),
content: Text(detail),
backgroundColor: grayLight,
actions: [
FlatButton(
child: Text('OK'),
onPressed: () {
Navigator.pop(context, 'OK');
},
),
],
),
);
}
As per your question, you want to request permission when user clicks 'OK' button in dialog.
You can create a callback, that is when user clicks 'OK'
showAlertPopup(context, '','OK', (){
//Code you want to execute when user clicks 'OK'
});
And little changes in you showAlertPopup
showAlertPopup(BuildContext context, String title, String detail, Function onClick) async {
showDemoDialog({BuildContext context, Widget child}) async {
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return child;
});
}
return showDemoDialog(
context: context,
child: AlertDialog(
title: Text(title),
content: Text(detail),
backgroundColor: grayLight,
actions: [
FlatButton(
child: Text('OK'),
onPressed: () {
//Your callback
onClick();
Navigator.pop(context, 'OK');
},
),
],
),
);
}
I'm saving the data that is fetched from an API to the sqflite in flutter project, everything is working good, except that after clicking a raised button the data should be insert into the table and a new page should be open but there is no data unless I refresh that page so the data appear
As you can see, here is the code of the raised button:
RaisedButton(
child: Text('Get Cities'),
onPressed: () async {
setState(() {
GetAllData.data.Getdata();
});
await Navigator.push(context, MaterialPageRoute<void>(
builder: (BuildContext context) => StoreList()));
setState(() {});
},
)
Inside the setState I'm calling a function Getdata to get the data from the sqflite, after it getting it the app should open a new page
And below is the code of the page which should show the data in a ListView:
class StoreList extends StatefulWidget { #override
_StoreListState createState() => _StoreListState();}
class _StoreListState extends State<StoreList> {
#override void initState() {
super.initState();
setState(() {
DatabaseProvider_API.db.getRoutes();
});}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Stores List'),
),
body: FutureBuilder<List<Stores>>(
future: DatabaseProvider_API.db.getStores(),
builder: (context, snapshot){
if(snapshot.data == null){
return Center(
child: CircularProgressIndicator(),
);
}
else {
return ListView.separated(
separatorBuilder: (BuildContext context, int index){
return Divider();
},
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int index){
String name = snapshot.data[index].sTORENAME;
String name_ar = snapshot.data[index].cITY;
return ListTile(
title: Text(name),
subtitle:Text (name_ar),
onTap: ()async{
setState(() {
});
await
Navigator.push(context, MaterialPageRoute<void>(
builder: (BuildContext context) => Category() ));
},
);
},
);
}
},
),
floatingActionButton: new FloatingActionButton(
onPressed: () {
setState(() {});
},
child: new Icon(Icons.update),
),
);
}
}
Try to add the await keyword before evoke GetAllData.data.GetData()
RaisedButton(
child: Text('Get Cities'),
onPressed: () async {
// await for new data to be inserted
await GetAllData.data.Getdata();
await Navigator.push(context, MaterialPageRoute<void>(
builder: (BuildContext context) => StoreList()));
setState(() {
dataFuture = GetAllData.data.Getdata();
});
},
)
I'm having a problem calling Navigator.of(context).pop() on my onPressed property in SimpleDialogOption widget. I need to set the state and dismiss the dialog. But calling setState is preventing my dialog to close. Without setState the dialog closes. Here is my dialog
WidgetsBinding.instance.addPostFrameCallback((_) {
showDialog(
builder: (BuildContext context) {
return SimpleDialog(
children: _children(suburbs),
backgroundColor: Colors.white,
title: Text('Pick your suburb'),
);
},
context: context);
});
and the method I use for the list of the Dialog:
List<Widget> _children(List<Suburb> suburbs) {
return suburbs
.map((suburb) => SimpleDialogOption(
onPressed: () {
print('#####################');
setState(() {
postcode = suburb.name;
});
Navigator.of(context).pop();
},
child: Text(suburb.name)))
.toList();
}
you can await until the return value comes from the navigator.pop,
and then call a setState
WidgetsBinding.instance.addPostFrameCallback((_) async {
postcode = await showDialog(
builder: (BuildContext context) {
return SimpleDialog(
children: _children(suburbs),
backgroundColor: Colors.white,
title: Text('Pick your suburb'),
);
},
context: context);
setState(() {
postcode;
});
});
List<Widget> _children(List<Suburb> suburbs) {
return suburbs
.map((suburb) => SimpleDialogOption(
onPressed: () {
print('#####################');
Navigator.of(context).pop(suburb.name);
},
child: Text(suburb.name)))
.toList();
}