so i am very new to flutter so please forgive me in advance for any scrappy code.. okay so i am trying to grab data stored in firebase as a map in the below function called getTotalBalance and then use some of the details in calculating the total balance, total expense and totalIncome and for some reason i keep getting an error saying
type 'String' is not a subtype of type 'int' in type cast.
class Calculations {
static int totalBalance = 0;
static int totalIncome = 0;
static int totalExpense = 0;
static getTotalBalance(Map entireData) {
int totalBalance = 0;
int totalIncome = 0;
int totalExpense = 0;
entireData.forEach((key, value) async {
print(value);
if (value['Income'] == 'Income') {
totalBalance = (value['amount'] as int);
totalIncome = (value['amount'] as int);
} else {
totalBalance -= (value['amount'] as int);
totalExpense = (value['amount'] as int);
}
});
}
}
Center(
child: Padding(
padding: const EdgeInsets.only(left: 20, right: 20),
child: StreamBuilder<QuerySnapshot>(
stream: _firebaseFirestore
.where('userId', isEqualTo: user?.uid)
.snapshots(),
builder: (context, AsyncSnapshot snapshot) {
if (snapshot.hasError) {
// TODO: add a snackbar
}
if (snapshot.connectionState == ConnectionState.waiting) {
return const Center(
child: CircularProgressIndicator(),
);
}
final List storedocs = [];
snapshot.data!.docs.map((DocumentSnapshot document) {
Map a = document.data() as Map<String, dynamic>;
storedocs.add(a);
a['id'] = document.id;
}).toList();
Calculations.getTotalBalance(storedocs.asMap());
return ListView.builder(
shrinkWrap: true,
itemCount: storedocs.length,
itemBuilder: (context, index) {
TaskModel task =
TaskModel.fromJson(snapshot.data.docs[index]);
return Column(
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Container(
width: 50,
height: 50,
decoration: const BoxDecoration(
color: Colors.orange,
shape: BoxShape.circle),
child: const Center(
child: Icon(Icons.person),
),
),
const SizedBox(
width: 15,
),
Container(
height: 40,
width: 90,
child: Column(
mainAxisAlignment:
MainAxisAlignment.center,
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(
task.item,
style: const TextStyle(
fontWeight: FontWeight.bold,
fontSize: 15,
color: Colors.white),
),
const SizedBox(
height: 5,
),
Text(
task.date,
style: const TextStyle(
fontWeight: FontWeight.w400,
fontSize: 12,
color: Colors.grey),
),
],
),
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Text(
task.amount,
style: const TextStyle(
fontSize: 15,
fontWeight: FontWeight.w600,
color: Colors.green),
)
],
),
IconButton(
icon: const Icon(
Icons.close,
color: Colors.orange,
),
onPressed: () {
FirebaseFirestore.instance
.collection('tasks')
.doc(task.id)
.delete();
}),
],
),
const Padding(
padding: EdgeInsets.only(left: 65, top: 8),
child: Divider(
thickness: 0.8,
),
)
],
);
});
}),
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
E/flutter ( 9543): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast
E/flutter ( 9543): #0 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:18:42)
E/flutter ( 9543): #1 Calculations.getTotalBalance.<anonymous closure> (package:daddys_app/calculations.dart:11:24)
E/flutter ( 9543): #2 ListMapView.forEach (dart:_internal/list.dart:242:8)
E/flutter ( 9543): #3 Calculations.getTotalBalance (package:daddys_app/calculations.dart:11:16)
E/flutter ( 9543): #4 _BarItemPageState.build.<anonymous closure> (package:daddys_app/Screens/nav_pages/bar_item_page.dart:143:36)
E/flutter ( 9543): #5 StreamBuilder.build (package:flutter/src/widgets/async.dart:442:81)
E/flutter ( 9543): #6 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:124:48)
E/flutter ( 9543): #7 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)
E/flutter ( 9543): #8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
E/flutter ( 9543): #9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
E/flutter ( 9543): #10 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
E/flutter ( 9543): #11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
E/flutter ( 9543): #12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
E/flutter ( 9543): #13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
E/flutter ( 9543): #14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter ( 9543): #15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter ( 9543): #16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
E/flutter ( 9543): #17 _rootRun (dart:async/zone.dart:1426:13)
E/flutter ( 9543): #18 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter ( 9543): #19 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
E/flutter ( 9543): #20 _invoke (dart:ui/hooks.dart:151:10)
E/flutter ( 9543): #21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
E/flutter ( 9543): #22 _drawFrame (dart:ui/hooks.dart:115:31)
E/flutter ( 9543):
CodePudding user response：
I think issue comes from
if (value['Income'] == 'Income') {
totalBalance = (value['amount'] as int);
totalIncome = (value['amount'] as int);
} else {
totalBalance -= (value['amount'] as int);
totalExpense = (value['amount'] as int);
}
Instead of using as int, which might be getting wrong
data format value while reading map(value), you can use int.tryPerse.
Replace those code by following,
totalBalance = int.tryParse(value['amount']) ?? 0;