Related
I want to place the card in the center
here the code
class _HomeState extends State<Home>{
#override
Widget build(BuildContext context) {
var myActivity=["Join Meeting","Create Meeting", "Schedule Meeting","Yet to be decided"];
var myGridView = new GridView.builder(
itemCount: myActivity.length,
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (BuildContext context,int index) {
return new GestureDetector(
child: Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
),
onTap: () {
showDialog(
barrierDismissible: false,
context: context,
child: CupertinoAlertDialog(
content: Text(myActivity[index],),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("Ok"))
],
)
);
},
);
},
);
return Scaffold(
body: myGridView,
);
}
}
Two things required to do that first wrap Grid Widget inside Center Widget & give GridView property as shrinkWrap: true,
#override
Widget build(BuildContext context) {
print("In Test Widget");
// TODO: implement build
var myActivity=["Join Meeting","Create Meeting", "Schedule Meeting","Yet to be decided"];
var myGridView = new GridView.builder(
itemCount: myActivity.length,
shrinkWrap: true,
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (BuildContext context,int index) {
return new GestureDetector(
child: Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
),
onTap: () {
showDialog(
barrierDismissible: false,
context: context,
child: CupertinoAlertDialog(
content: Text(myActivity[index],),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("Ok"))
],
)
);
},
);
},
);
return Scaffold(
body: Center(child: myGridView),
);
}
You can wrap your view(Card) with Row component and set mainAxisAlignment attribute to MainAxisAlignment.center like below.
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Card(
elevation: 5.0,
child: Container(
alignment: Alignment.center,
margin: EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: Text(myActivity[index]),
),
)
],
),
To display the GridView at the center of the screen, you can simply wrap myGridView inside a Center widget like this..
return Scaffold(
body: Center(child: myGridView),
);
You also need to set the GridView's shrinkWrap parameter to true. Otherwise gridView will take up the whole screen and so visually the Center widget will have no effect on its position.
Wrap your layout in a Column() and set MainAxisAlignment to center.
Column(
mainAxisAlignment: MainAxisAlignment.center,
child: <--YOUR EXISTING LAYOUT -->)
It can also center horizontally with crossAxisAlignment.
I have four cards simply now i want a button in the end and center how would it would be
Insert GridView.counter in a Column
set shrinkWrap and primary property as true
put your button inside Column and below gridview, not inside button.
put the button in Center Widget / set crossAxisAlignment: CrossAxisAlignment.center
import 'package:flutter/material.dart';
class Test extends StatefulWidget {
#override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> with SingleTickerProviderStateMixin{
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Page - 2"),
),
body: SafeArea(
child: Column(
children: <Widget>[
GridView.count(
shrinkWrap: true,
primary: true,
crossAxisCount: 2,
children: <Widget>[
Container(
color: Colors.red,
),
Container(
color: Colors.green,
),
Container(
color: Colors.blue,
),
Container(
color: Colors.yellow,
),
],
),
Divider(
color: Colors.grey.shade600,
),
Center(
child: RaisedButton(
child: Text("Button"),
onPressed: (){},
),
)
],
),
),
);
}
}
I have a ListView inside a bottomSheet, that is built using an array of elements. Currently I have one item in there "empty" which is then .clear()ed and populated after an async DB call.
The variable update is correct, and I try to use setState((){}) but the ListView isn't updated at all. I need to close the bottomSheet, reopen it, and the ListView then has the correct items.
Do I need to just call setState or does the bottomSheet builder need to be flagged to update?
Main ListView section:
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('My Map'),
backgroundColor: Colors.green[700],
),
//Put in a stack widget so can layer other widgets on top of map widget
body: Stack(
children: <Widget>[
GoogleMap(
mapType: _currentMapType,
markers: _markers,
onMapCreated: _onMapCreated,
onCameraMove: _onCameraMove,
initialCameraPosition: CameraPosition(
target: _center,
zoom: 11.0,
),
),
Padding(
padding: const EdgeInsets.all(16.0),
child: Align(
alignment: Alignment.bottomCenter,
child: Row(mainAxisSize: MainAxisSize.min, children: <Widget>[
SizedBox(width: 16.0),
Builder(
builder: (context) => FloatingActionButton(
...
),
),
SizedBox(width: 16.0),
FloatingActionButton(
...
),
SizedBox(width: 16.0),
Builder(
builder: (context) => FloatingActionButton(
child: Icon(Icons.file_download, size: 36.0),
backgroundColor: Colors.green,
onPressed: () {
showBottomSheet(
context: context,
builder: (context) {
return ListView(
padding: EdgeInsets.all(15.0),
children: <Widget>[
...
Divider(),
ListTile(
title: Text("Remote JSON Download"),
trailing:
Icon(Icons.refresh),
selected: true,
onTap: _OnPressedReloadJSON, <-------------
),
Divider(),
Container(
height: 150.0,
child: ListView.builder( <-------------
scrollDirection: Axis.horizontal,
itemCount : testList.length,
itemBuilder: (BuildContext context, int index) {
return Container(
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
},
),
),
Async Get:
class _MyAppState extends State<MyApp> {
...
_OnPressedReloadJSON() {
fetchJSONAndMakeListTile();
}
...
List<String> testList= ["empty"];
Future<http.Response> fetchJSONAndMakeListTile() async {
final response = await http.get('https://..... file.json');
// If the server did return a 200 OK response, then parse the JSON.
if (response.statusCode == 200) {
List<db_manager.MyObject> myObjects = (json.decode(response.body) as List)
.map((e) => db_manager.MyObject.fromJson(e))
.toList();
testList.clear();
myObjects.forEach((db_manager.MyObject al) {
testList.add(al.code);
print("debug:"+al.code+" - "+al.name); <------------- prints correctly
});
//TODO Does this even work?
//Trigger update of state - ie redraw/reload UI elements
setState(() {});
} else {
// If the server did not return a 200 OK response, then throw an exception.
print(response);
throw Exception('Failed to load json');
}
}
UPDATE:
I've abstracted the BottomSheet builder into another class (as per another answer) as its own StatefulWidget but I can't seem to access the void onPress() method from my main dart file. If the BottomSheet creation/builder is in this separate dart file, how do I call it to build and then update its state with the async call updating the listview contents List?
BottomSheetWidget.dart
class BottomSheetDatabases extends StatefulWidget {
#override
_BottomSheetDatabases createState() => _BottomSheetDatabases();
}
class _BottomSheetDatabases extends State<BottomSheetDatabases> {
void _onpress() {
}
void loadMe() {
}
List<String> testList= ["empty"];
#override
Widget build(BuildContext context) {
return BottomSheet(
builder: (context) {
return ListView(
padding: EdgeInsets.all(15.0),
children: <Widget>[
ListTile(
...
),
Divider(),
Container(
height: 150.0,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: testList.length,
itemBuilder: (BuildContext context, int index) {
return Container(
key: UniqueKey(),
//TODO ??
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
},
),
//),
//),
),
...
Main.dart:
void _loadSheetDatabases() {
BottomSheetWidget bottomSheetwidget = BottomSheetWidget();
bottomSheetwidget.loadMe();
}
Seems to me that a Key are missing into widget that ListView.Builder returns, try to put a UniqueKey() or ValueKey into Container or Text:
Container(
key: UniqueKey(),
padding: EdgeInsets.all(5.0),
margin: EdgeInsets.all(5.0),
width: 150.0,
color: Colors.red,
child: Text(testList[index]),
);
Your ListView is only built when onPressed is called on your FloatingActionButton.
I assume that's why it doesn't get built again when the state changes.
You could wrap the code to build the ListView in a new StatefulWidget with its own state and then update it when testList changes.
I made a chatbot with dialogflow and (https://github.com/diegodalbosco/flutter_dialogflow) this is working normaly with simple text response.
Then when I add Google Assistant on a respond (Intent) like: answers with Basic Card.
When i lunch this application on android phone, I can write normally and i can see normal answers. But when i try to write "Query" or "Intent" something to call the Google Assistant Basic Card response, application stop and error.
Could someone help?
I believe that Google Assistant response is supported by Flutter?
Could some one explain how to set, display rich message of Google Assistant response like Basic Card in flutter App?
ThankYou
I haded: "
and
"ChatMessage message = new ChatMessage(
text: response.queryResult.fulfillmentText
?? new df.BasicCard(),"
and
"new Container(
margin: const EdgeInsets.only(top: 5.0),
child: new Text(text?? new df.BasicCard()),
),
"
looking for docs on:
https://pub.dev/documentation/flutter_dialogflow_v2/latest/model_query_result/QueryResult/fulfillmentMessages.html
for fulfillmentMessages property
-
https://pub.dev/documentation/flutter_dialogflow_v2/latest/model_message_basic_card/BasicCard-class.html
for BasicCard
-
https://pub.dev/documentation/flutter_dialogflow_v2/latest/model_query_result/QueryResult-class.html
for QueryResult class
import 'package:flutter_dialogflow_v2/flutter_dialogflow_v2.dart' as df;
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Example Dialogflow Flutter',
theme: new ThemeData(
primarySwatch: Colors.deepOrange,
),
home: new MyHomePage(
title: 'Flutter Demo Dialogflow',
),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
final List<df.BasicCard> fulfillmentMessages = <df.BasicCard>[];
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final List<ChatMessage> _messages = <ChatMessage>[];
final TextEditingController _textController = new TextEditingController();
Widget _buildTextComposer() {
return new IconTheme(
data: new IconThemeData(color: Theme.of(context).accentColor),
child: new Container(
margin: const EdgeInsets.symmetric(horizontal: 8.0),
child: new Row(
children: <Widget>[
new Flexible(
child: new TextField(
controller: _textController,
onSubmitted: _handleSubmitted,
decoration:
new InputDecoration.collapsed(hintText: 'Send a message'),
),
),
new Container(
margin: new EdgeInsets.symmetric(horizontal: 4.0),
child: new IconButton(
icon: new Icon(Icons.send),
onPressed: () => _handleSubmitted(_textController.text)),
),
],
),
),
);
}
void response(query) async {
_textController.clear();
df.AuthGoogle authGoogle =
await df.AuthGoogle(fileJson: 'assets/project-id.json').build();
df.Dialogflow dialogflow =
df.Dialogflow(authGoogle: authGoogle, sessionId: '123456');
df.DetectIntentResponse response = await dialogflow.detectIntent(query);
ChatMessage message = new ChatMessage(
text: response.queryResult.fulfillmentText
?? new df.BasicCard()
,
name: 'Bot',
type: false,
);
setState(() {
_messages.insert(0, message);
});
}
void _handleSubmitted(String text) {
_textController.clear();
ChatMessage message = new ChatMessage(
text: text,
name: 'Rances',
type: true,
);
setState(() {
_messages.insert(0, message);
});
response(text);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Dialogflow V2'),
),
body: new Column(children: <Widget>[
new Flexible(
child: new ListView.builder(
padding: new EdgeInsets.all(8.0),
reverse: true,
itemBuilder: (_, int index) => _messages[index],
itemCount: _messages.length,
)),
new Divider(height: 1.0),
new Container(
decoration: new BoxDecoration(color: Theme.of(context).cardColor),
child: _buildTextComposer(),
),
]),
);
}
}
class ChatMessage extends StatelessWidget {
ChatMessage({this.text, this.name, this.type});
final String text;
final String name;
final bool type;
List<Widget> otherMessage(context) {
return <Widget>[
new Container(
margin: const EdgeInsets.only(right: 16.0),
child: new CircleAvatar(child: new Image.asset('img/placeholder.png')),
),
new Expanded(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Text(this.name,
style: new TextStyle(fontWeight: FontWeight.bold)),
new Container(
margin: const EdgeInsets.only(top: 5.0),
child: new Text(text?? new df.BasicCard()),
),
],
),
),
];
}
List<Widget> myMessage(context) {
return <Widget>[
new Expanded(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
new Text(this.name, style: Theme.of(context).textTheme.subhead),
new Container(
margin: const EdgeInsets.only(top: 5.0),
child: new Text(text),
),
],
),
),
new Container(
margin: const EdgeInsets.only(left: 16.0),
child: new CircleAvatar(child: new Text(this.name[0])),
),
];
}
#override
Widget build(BuildContext context) {
return new Container(
margin: const EdgeInsets.symmetric(vertical: 10.0),
child: new Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: this.type ? myMessage(context) : otherMessage(context),
),
);
}
}
I expect the output like:
when I ask the preset Intent for BasicCard, the app show response with BasicCard but the actual output is
error:
"
E/flutter ( 4203): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The method '[]' was called on null.
E/flutter ( 4203): Receiver: null
E/flutter ( 4203): Tried calling: "
and no response on the flutter chat App.
For Google Assistant Actions, you need to use one of our client libraries (Node.js or Java). The Dialogflow library are designed to support other platforms but not the Google Assistant specifically (some things might work cross-platform, but other like cards will not).
Currently I have a listview of widgets and I stack a bottom button on the Top of the Stack to be always display. but when I tap on the textfield, the bottom button is push on the top, It's very ugly. How can I push the keyboard over the Button ?
thank you
here is a code example:
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final TextEditingController _controller = new TextEditingController();
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
),
body: new Stack(
children: <Widget>[
new ListView(
children: <Widget>[
new Column(
children: <Widget>[
new Padding(
padding: const EdgeInsets.all(100.0),),
new Card(
child: new Padding(
padding: const EdgeInsets.all(10.0),
child: new Row(
children: <Widget>[
new Expanded(
child: new TextField(
controller: _controller,
decoration: new InputDecoration(hintText: "Enter an address"),
),
),
],
),
),
),
],
)
],
),
new Align
(
alignment: Alignment.bottomCenter,
child : new RaisedButton(
child: new Text("Button", style: TextStyle(color: Colors.black, fontWeight: FontWeight.w700, fontSize: 18.0,)),
onPressed: (){
},
highlightElevation: 4.0,
highlightColor : Colors.white,
shape: new RoundedRectangleBorder(borderRadius: new BorderRadius.circular(30.0))
),
),
]
)
);
}
}
I would recommend putting the "Button" on the Bottom outside of the Stack inside of a floatingActionButton.
floatingActionButton: FloatingActionButton.extended(
elevation: 4.0,
label: Text(Appliquer),
onPressed: () {},
),
floatingActionButtonLocation:
FloatingActionButtonLocation.centerDocked,
EDIT AFTER CODE WAS ADDED:
As I said in the comments I would use a FloatingActionButton/BottomNaviagtionBar or a Save-Icon in the AppBar
Here I added the FloatingActionButton to your code:
class _MyHomePageState extends State<MyHomePage> {
final TextEditingController _controller = new TextEditingController();
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(),
body: new Stack(children: <Widget>[
new ListView(
children: <Widget>[
new Column(
children: <Widget>[
new Padding(
padding: const EdgeInsets.all(100.0),
),
new Card(
child: new Padding(
padding: const EdgeInsets.all(10.0),
child: new Row(
children: <Widget>[
new Expanded(
child: new TextField(
controller: _controller,
decoration: new InputDecoration(
hintText: "Enter an address"),
),
),
],
),
),
),
],
)
],
),
],
),
floatingActionButton: FloatingActionButton.extended(
icon: Icon(Icons.save), label:
new Text('Appliquer'),
onPressed: () { /*perform your Action here*/ },
),
);
}
}