我创建了一个页面来添加地址，当我按下“添加地址”按钮时，它应该打开 DeliveryAddressBottomSheetWidget 但它显示错误
==╡ 异常被捕获 I/flutter (13370)：处理手势时抛出以下 NoSuchMethodError： I/flutter (13370)：在 null 上调用了 getter 'currentState'。 I/flutter (13370)：接收器：空 I/flutter (13370)：尝试调用：currentState
class Location2Widget extends StatefulWidget {
final GlobalKey<ScaffoldState> parentScaffoldKey;
Location2Widget({Key key, this.parentScaffoldKey}) : super(key: key);
@override
_Location2WidgetState createState() => _Location2WidgetState();
}
class _Location2WidgetState extends StateMVC<Location2Widget> {
HomeController _con;
_Location2WidgetState() : super(HomeController()) {
_con = controller;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: RefreshIndicator(
onRefresh: _con.refreshHome,
child: SingleChildScrollView(
padding: EdgeInsets.symmetric(horizontal: 0, vertical: 10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
children: [
Padding(
padding: const EdgeInsets.only(top: 15, left: 20, right: 20, bottom: 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
InkWell(
onTap: () {
//if (currentUser.value.apiToken == null) {
//_con.requestForCurrentLocation(context);
//} else {
var bottomSheetController = widget.parentScaffoldKey.currentState.showBottomSheet(
(context) => DeliveryAddressBottomSheetWidget(scaffoldKey: widget.parentScaffoldKey),
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.only(topLeft: Radius.circular(10), topRight: Radius.circular(10)),
),
);
bottomSheetController.closed.then((Navigator) {
_con.refreshHome();
});
},
child: Container(
padding: const EdgeInsets.symmetric(vertical: 6, horizontal: 10),
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(5)),
color: settingsRepo.deliveryAddress.value?.address == null
? Theme.of(context).accentColor
: Theme.of(context).accentColor,
),
child: Text(
S.of(context).change_delivery,
style: TextStyle(
color:
settingsRepo.deliveryAddress.value?.address == null ? Theme.of(context).primaryColor : Theme.of(context).primaryColor),
),
),
),
],
),
if (settingsRepo.deliveryAddress.value?.address != null)
Padding(
padding: const EdgeInsets.only(top: 12),
child: Text(
S.of(context).near_to + " " + (settingsRepo.deliveryAddress.value?.address),
style: Theme.of(context).textTheme.caption,
),
),
],
),
),
],
),
),
),
);
}
}
DeliveryAddressBottomSheetWidget 代码
class DeliveryAddressBottomSheetWidget extends StatefulWidget {
final GlobalKey<ScaffoldState> scaffoldKey;
DeliveryAddressBottomSheetWidget({Key key, this.scaffoldKey}) : super(key: key);
@override
_DeliveryAddressBottomSheetWidgetState createState() => _DeliveryAddressBottomSheetWidgetState();
}
class _DeliveryAddressBottomSheetWidgetState extends StateMVC<DeliveryAddressBottomSheetWidget> {
DeliveryAddressesController _con;
_DeliveryAddressBottomSheetWidgetState() : super(DeliveryAddressesController()) {
_con = controller;
}
@override
Widget build(BuildContext context) {
return Container(
height: 350,
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius: BorderRadius.only(topRight: Radius.circular(20), topLeft: Radius.circular(20)),
boxShadow: [
BoxShadow(color: Theme.of(context).focusColor.withOpacity(0.4), blurRadius: 30, offset: Offset(0, -30)),
],
),
child: Stack(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 30),
child: ListView(
padding: EdgeInsets.only(top: 20, bottom: 15, left: 20, right: 20),
children: <Widget>[
InkWell(
onTap: () async {
LocationResult result = await showLocationPicker(
context,
setting.value.googleMapsKey,
initialCenter: LatLng(deliveryAddress.value?.latitude ?? 0, deliveryAddress.value?.longitude ?? 0),
automaticallyAnimateToCurrentLocation: true,
//mapStylePath: 'assets/mapStyle.json',
myLocationButtonEnabled: true,
resultCardAlignment: Alignment.bottomCenter,
);
_con.addAddress(new Address.fromJSON({
'address': result.address,
'latitude': result.latLng.latitude,
'longitude': result.latLng.longitude,
}));
print("result = $result");
//Navigator.of(widget.scaffoldKey.currentContext).pop();
},
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Container(
height: 36,
width: 36,
decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(5)), color: Theme.of(context).accentColor),
child: Icon(
Icons.add_circle_outline,
color: Theme.of(context).primaryColor,
size: 22,
),
),
SizedBox(width: 15),
Flexible(
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
S.of(context).add_new_delivery_address,
overflow: TextOverflow.ellipsis,
maxLines: 2,
style: Theme.of(context).textTheme.bodyText2,
),
],
),
),
SizedBox(width: 8),
Icon(
Icons.keyboard_arrow_right,
color: Theme.of(context).accentColor,
),
],
),
)
],
),
),
ListView.separated(
padding: EdgeInsets.symmetric(vertical: 25),
scrollDirection: Axis.vertical,
shrinkWrap: true,
primary: false,
itemCount: _con.addresses.length,
separatorBuilder: (context, index) {
return SizedBox(height: 25);
},
itemBuilder: (context, index) {
// return DeliveryAddressesItemWidget(
// address: _con.addresses.elementAt(index),
// onPressed: (Address _address) {
// _con.chooseDeliveryAddress(_address);
// },
// onLongPress: (Address _address) {
// DeliveryAddressDialog(
// context: context,
// address: _address,
// onChanged: (Address _address) {
// _con.updateAddress(_address);
// },
// );
// },
// onDismissed: (Address _address) {
// _con.removeDeliveryAddress(_address);
// },
// );
return InkWell(
onTap: () {
_con.changeDeliveryAddress(_con.addresses.elementAt(index)).then((value) {
Navigator.of(context).pushNamed('/Pages');
});
},
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Container(
height: 36,
width: 36,
decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(5)), color: Theme.of(context).focusColor),
child: Icon(
Icons.place,
color: Theme.of(context).primaryColor,
size: 22,
),
),
SizedBox(width: 15),
Flexible(
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
_con.addresses.elementAt(index).address,
overflow: TextOverflow.ellipsis,
maxLines: 3,
style: Theme.of(context).textTheme.bodyText2,
),
],
),
),
SizedBox(width: 8),
Icon(
Icons.keyboard_arrow_right,
color: Theme.of(context).focusColor,
),
],
),
)
],
),
);
},
),
],
),
),
Container(
height: 30,
width: double.infinity,
padding: EdgeInsets.symmetric(vertical: 13, horizontal: config.App(context).appWidth(42)),
decoration: BoxDecoration(
color: Theme.of(context).focusColor.withOpacity(0.05),
borderRadius: BorderRadius.only(topRight: Radius.circular(20), topLeft: Radius.circular(20)),
),
child: Container(
width: 30,
decoration: BoxDecoration(
color: Theme.of(context).focusColor.withOpacity(0.8),
borderRadius: BorderRadius.circular(3),
),
//child: SizedBox(height: 1,),
),
),
],
),
);
}
}
错误详细信息
I/flutter (13370): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter (13370): The following NoSuchMethodError was thrown while handling a gesture:
I/flutter (13370): The getter 'currentState' was called on null.
I/flutter (13370): Receiver: null
I/flutter (13370): Tried calling: currentState
I/flutter (13370):
I/flutter (13370): When the exception was thrown, this was the stack:
I/flutter (13370): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
I/flutter (13370): #1 _Location2WidgetState.build.<anonymous closure> (package:food_delivery_app/src/pages/location2.dart:62:88)
I/flutter (13370): #2 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
I/flutter (13370): #3 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
I/flutter (13370): #4 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
I/flutter (13370): #5 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
I/flutter (13370): #6 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
I/flutter (13370): #7 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:222:7)
I/flutter (13370): #8 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:476:9)
I/flutter (13370): #9 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:77:12)
I/flutter (13370): #10 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:122:9)
I/flutter (13370): #11 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
I/flutter (13370): #12 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:120:18)
I/flutter (13370): #13 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:106:7)
I/flutter (13370): #14 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:358:19)
I/flutter (13370): #15 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
I/flutter (13370): #16 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
I/flutter (13370): #17 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
I/flutter (13370): #18 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
I/flutter (13370): #19 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
I/flutter (13370): #23 _invoke1 (dart:ui/hooks.dart:265:10)
I/flutter (13370): #24 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
I/flutter (13370): (elided 3 frames from dart:async)
I/flutter (13370):
I/flutter (13370): Handler: "onTap"
I/flutter (13370): Recognizer:
I/flutter (13370): TapGestureRecognizer#113cd
I/flutter (13370): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (13370): Another exception was thrown: NoSuchMethodError: The getter 'currentState' was called on null.
如果您需要更多代码，请告诉我