我尝试在Android Studio中运行和应用程序，但他正在加载白屏幕页面。
解决方案吗?我将感激任何帮助，谢谢!
PD: app是https://codecanyon.net/item/masterstudy-lms-mobile-app-flutter-ios-android/27103832
手机屏幕截图:https://prnt.sc/SHtC2-4IIpwK
has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!.addPostFrameCallback((_) {
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/web_selection_manager.dart:119:24: Warning: Operand of
null-aware operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay_manager.dart:138:28: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
if (SchedulerBinding.instance!.schedulerPhase ==
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay_manager.dart:140:26: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:141:26: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
if (SchedulerBinding.instance!.schedulerPhase ==
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:143:24: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!.addPostFrameCallback(_markNeedsBuild);
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:193:26: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
if (SchedulerBinding.instance!.schedulerPhase ==
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:195:24: Warning: Operand of null-aware
operation '!' has type 'SchedulerBinding' which excludes null.
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!.addPostFrameCallback(_markNeedsBuild);
^
/C:/tools/flutter/.pub-cache/hosted/pub.dartlang.org/overlay_support-1.2.1/lib/src/overlay_entry.dart:101:24: Warning: Operand of null-aware operation '?.' has
type 'WidgetsBinding' which excludes null.
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/tools/flutter/packages/flutter/lib/src/widgets/binding.dart').
WidgetsBinding.instance?.scheduleFrameCallback((_) => animateRemove());
^
Syncing files to device 2109119DG... 551ms
Flutter run key commands.
r Hot reload.
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).
Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety
An Observatory debugger and profiler on 2109119DG is available at: http://127.0.0.1:56868/txVLacBS3yA=/
The Flutter DevTools debugger and profiler on 2109119DG is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:56868/txVLacBS3yA=/
I/TRuntime.CctTransportBackend(32512): Status Code: 200
I/flutter (32512): ----------------FIREBASE CRASHLYTICS----------------
I/flutter (32512): DioError [DioErrorType.response]: Http status error [404]
I/flutter (32512): Source stack:
I/flutter (32512): #0 DioMixin.fetch (package:dio/src/dio_mixin.dart:488:35)
I/flutter (32512): #1 DioMixin.request (package:dio/src/dio_mixin.dart:483:12)
I/flutter (32512): #2 DioMixin.get (package:dio/src/dio_mixin.dart:61:12)
I/flutter (32512): #3 SplashWidgetState.getAppSettingColor (package:masterstudy_app/ui/screens/splash/splash_screen.dart:52:37)
I/flutter (32512): <asynchronous suspension>
I/flutter (32512): #0 DioMixin.fetch.<anonymous closure> (package:dio/src/dio_mixin.dart:643:7)
I/flutter (32512): #1 _rootRunBinary (dart:async/zone.dart:1450:47)
I/flutter (32512): #2 _CustomZone.runBinary (dart:async/zone.dart:1342:19)
I/flutter (32512): #3 _FutureListener.handleError (dart:async/future_impl.dart:162:22)
I/flutter (32512): #4 Future._propagateToListeners.handleError (dart:async/future_impl.dart:778:47)
I/flutter (32512): #5 Future._propagateToListeners (dart:async/future_impl.dart:799:13)
I/flutter (32512): #6 Future._completeError (dart:async/future_impl.dart:574:5)
I/flutter (32512): #7 _SyncCompleter._completeError (dart:async/future_impl.dart:51:12)
I/flutter (32512): #8 _Completer.completeError (dart:async/future_impl.dart:23:5)
I/flutter (32512): #9 Future.any.onError (dart:async/future.dart:616:45)
I/flutter (32512): #10 _rootRunBinary (dart:async/zone.dart:1450:47)
I/flutter (32512): #11 _CustomZone.runBinary (dart:async/zone.dart:1342:19)
I/flutter (32512): #12 _FutureListener.handleError (dart:async/future_impl.dart:162:22)
I/flutter (32512): #13 Future._propagateToListeners.handleError (dart:async/future_impl.dart:778:47)
I/flutter (32512): #14 Future._propagateToListeners (dart:async/fu
I/flutter (32512): ----------------------------------------------------
V/MiuiFrameworkFactory(32512): get AllImpl object = android.common.MiuiFrameworkFactoryImpl@b406fd8
W/MirrorManager(32512): this model don't Support
D/ForceDarkHelper(32512): onAppDarkModeChanged updateForceDarkMode: true
D/AnrScout(32512): AppScoutStateMachine created
D/FrameIndicator(32512): support status: 1 0x6f0ac5d018 0x6f0ac5d4c4
D/FrameIndicator(32512): support status: 1 0x6f0ac5d018 0x6f0ac5d4c4
我认为404来自您的服务器请求，所以交叉检查您的后端服务器是否通过邮递员完美响应。