Window10搭建Flutter for Android环境
Posted 我来乔23
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Flutter是谷歌的移动UI框架，可以快速在ios和android上构建高质量的原生用户界面。
目前，支持Windows、Linux、Mac OS以及Android和iOS，最新版本也已经支持Web（浏览器）平台。
本文大致记录下Flutter在Windows10下Android环境的搭建过程，一些细节步骤已经忽略。
环境搭建一旦成功，任务就已经成功了80%-90%，开始干！
系统环境：
软件清单：
- JDK：jdk-8u91-windows-x64.exe
- Android SDK：android-sdk_r24.4.1.zip 或 installer_r24.4.1-windows.exe
- Android Studio：android-studio-ide-192.6241897-windows.exe
- Flutter：flutter_windows_v1.12.13+hotfix.8-stable.zip
环境变量请参考资料自行添加。
执行flutter doctor时，可能存在问题：
Android license status unknow.
网上的资料都提示flutter doctor --android-licenses，但是需要升级Android SDK。
执行sdkmanager --update，命令窗口提示done，但是依旧提示升级Android SDK。
解决：在Android Studio中升级Android SDK Tools到可用最新版本，我这里原来是25.2.5，升级到了26.1.1就可以了！
在Android中新建Flutter工程，打开Android虚拟机，在main.dart窗口右键：
由于Android Studio比较重量级，很占用系统资源，而大家的电脑并不是都配置很高，此时可以切换到占用资源较小的VS Code上去。
为VS Code安装好Flutter插件：
打开Android虚拟机，打开Flutter工程，打开终端窗口（Ctrl+~）：flutter run
运行速度比Android Studio快多了~
体验热重载：修改下窗口标题，输入r立即执行效果
可能由于需要，需要切换Flutter SDK的版本，如果再编译之前的flutter工程可能会运行出错：
or: \'Matrix4\' isn\'t a type. Matrix4 result = Matrix4.identity() ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:503:22: Error: Getter not found: \'Matrix4\'. Matrix4 result = Matrix4.identity() ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:512:15: Error: Getter not found: \'Matrix4\'. ? Matrix4.rotationY(angle) ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:513:15: Error: Getter not found: \'Matrix4\'. : Matrix4.rotationX(angle) ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:514:9: Error: Getter not found: \'Matrix4\'. ) * Matrix4.translationValues(0.0, 0.0, radius); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:522:12: Error: Getter not found: \'Matrix4\'. return Matrix4.identity() ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:523:19: Error: Method not found: \'Vector4\'. ..setRow(0, Vector4(0, 0, 0, offset.dx)) ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:524:19: Error: Method not found: \'Vector4\'. ..setRow(1, Vector4(0, 0, 0, offset.dy)); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:532:37: Error: \'Matrix4\' isn\'t a type. List<String> debugDescribeTransform(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/matrix_utils.dart:550:5: Error: \'Matrix4\' isn\'t a type. Matrix4 value, { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/rounded_rectangle_border.dart:147:6: Error: Getter not found: \'required\'. @required this.circleness, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/rounded_rectangle_border.dart:147:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.circleness, ^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/shape_decoration.dart:78:6: Error: Getter not found: \'required\'. @required this.shape, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/shape_decoration.dart:78:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.shape, ^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/text_painter.dart:41:6: Error: Getter not found: \'required\'. @required this.size, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/text_painter.dart:41:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.size, ^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/text_painter.dart:42:6: Error: Getter not found: \'required\'. @required this.alignment, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/painting/text_painter.dart:42:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.alignment, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/drag_details.dart:135:6: Error: Getter not found: \'required\'. @required this.globalPosition, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/drag_details.dart:135:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.globalPosition, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:450:9: Error: \'Matrix4\' isn\'t a type. final Matrix4 transform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:475:28: Error: \'Matrix4\' isn\'t a type. PointerEvent transformed(Matrix4 transform); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:518:35: Error: \'Matrix4\' isn\'t a type. static Offset transformPosition(Matrix4 transform, Offset position) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:522:11: Error: \'Vector3\' isn\'t a type. final Vector3 position3 = Vector3(position.dx, position.dy, 0.0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:522:31: Error: Method not found: \'Vector3\'. final Vector3 position3 = Vector3(position.dx, position.dy, 0.0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:523:11: Error: \'Vector3\' isn\'t a type. final Vector3 transformed3 = transform.perspectiveTransform(position3); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:535:6: Error: Getter not found: \'required\'. @required Offset untransformedEndPosition, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:535:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required Offset untransformedEndPosition, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:537:6: Error: Getter not found: \'required\'. @required Offset untransformedDelta, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:537:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required Offset untransformedDelta, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:538:6: Error: Getter not found: \'required\'. @required Matrix4 transform, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:538:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required Matrix4 transform, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:538:15: Error: \'Matrix4\' isn\'t a type. @required Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:561:45: Error: \'Matrix4\' isn\'t a type. static Matrix4 removePerspectiveTransform(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:562:11: Error: \'Vector4\' isn\'t a type. final Vector4 vector = Vector4(0, 0, 1, 0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:562:28: Error: Method not found: \'Vector4\'. final Vector4 vector = Vector4(0, 0, 1, 0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:592:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:615:33: Error: \'Matrix4\' isn\'t a type. PointerAddedEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:660:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:680:35: Error: \'Matrix4\' isn\'t a type. PointerRemovedEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:738:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:769:33: Error: \'Matrix4\' isn\'t a type. PointerHoverEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:844:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:914:33: Error: \'Matrix4\' isn\'t a type. PointerEnterEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:990:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1060:32: Error: \'Matrix4\' isn\'t a type. PointerExitEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1124:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1153:32: Error: \'Matrix4\' isn\'t a type. PointerDownEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1218:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1251:32: Error: \'Matrix4\' isn\'t a type. PointerMoveEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1320:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1349:30: Error: \'Matrix4\' isn\'t a type. PointerUpEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1395:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1424:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1445:34: Error: \'Matrix4\' isn\'t a type. PointerScrollEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1493:5: Error: \'Matrix4\' isn\'t a type. Matrix4 transform, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/events.dart:1522:34: Error: \'Matrix4\' isn\'t a type. PointerCancelEvent transformed(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/force_press.dart:53:6: Error: Getter not found: \'required\'. @required this.globalPosition, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/force_press.dart:53:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.globalPosition, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/force_press.dart:55:6: Error: Getter not found: \'required\'. @required this.pressure, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/force_press.dart:55:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.pressure, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:68:3: Error: \'Matrix4\' isn\'t a type. Matrix4 _transform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:76:28: Error: \'Matrix4\' isn\'t a type. _transforms = Queue<Matrix4>(); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:96:15: Error: \'Matrix4\' isn\'t a type. final Queue<Matrix4> _transforms; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:134:22: Error: \'Matrix4\' isn\'t a type. void pushTransform(Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:137:57: Error: The method \'Vector4\' isn\'t defined for the class \'HitTestResult\'. - \'HitTestResult\' is from \'package:flutter/src/gestures/hit_test.dart\' (\'/D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart\'). Try correcting the name to the name of an existing method, or defining a method named \'Vector4\'. _debugVectorMoreOrLessEquals(transform.getRow(2), Vector4(0, 0, 1, 0)) && ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:138:60: Error: The method \'Vector4\' isn\'t defined for the class \'HitTestResult\'. - \'HitTestResult\' is from \'package:flutter/src/gestures/hit_test.dart\' (\'/D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart\'). Try correcting the name to the name of an existing method, or defining a method named \'Vector4\'. _debugVectorMoreOrLessEquals(transform.getColumn(2), Vector4(0, 0, 1, 0)), ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:167:37: Error: \'Vector4\' isn\'t a type. bool _debugVectorMoreOrLessEquals(Vector4 a, Vector4 b, { double epsilon = precisionErrorTolerance }) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:167:48: Error: \'Vector4\' isn\'t a type. bool _debugVectorMoreOrLessEquals(Vector4 a, Vector4 b, { double epsilon = precisionErrorTolerance }) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/hit_test.dart:170:13: Error: \'Vector4\' isn\'t a type. final Vector4 difference = a - b; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:179:3: Error: \'Matrix4\' isn\'t a type. Matrix4 _lastTransform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:270:15: Error: \'Matrix4\' isn\'t a type. final Matrix4 localToGlobalTransform = event.transform == null ? null : Matrix4.tryInvert(event.transform); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:270:81: Error: The getter \'Matrix4\' isn\'t defined for the class \'DragGestureRecognizer\'. - \'DragGestureRecognizer\' is from \'package:flutter/src/gestures/monodrag.dart\' (\'/D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart\'). Try correcting the name to the name of an existing getter, or defining a getter or field named \'Matrix4\'. final Matrix4 localToGlobalTransform = event.transform == null ? null : Matrix4.tryInvert(event.transform); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:294:13: Error: \'Matrix4\' isn\'t a type. final Matrix4 transform = _lastTransform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:310:15: Error: \'Matrix4\' isn\'t a type. final Matrix4 localToGlobal = transform != null ? Matrix4.tryInvert(transform) : null; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart:310:59: Error: The getter \'Matrix4\' isn\'t defined for the class \'DragGestureRecognizer\'. - \'DragGestureRecognizer\' is from \'package:flutter/src/gestures/monodrag.dart\' (\'/D:/GitWork/flutter/packages/flutter/lib/src/gestures/monodrag.dart\'). Try correcting the name to the name of an existing getter, or defining a getter or field named \'Matrix4\'. final Matrix4 localToGlobal = transform != null ? Matrix4.tryInvert(transform) : null; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:78:6: Error: Getter not found: \'required\'. @required PointerEvent mostRecentEvent, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:78:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required PointerEvent mostRecentEvent, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:293:6: Error: Getter not found: \'required\'. @required LinkedHashSet<MouseTrackerAnnotation> nextAnnotations, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:293:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required LinkedHashSet<MouseTrackerAnnotation> nextAnnotations, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:294:6: Error: Getter not found: \'required\'. @required _MouseState currentState, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/mouse_tracking.dart:294:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required _MouseState currentState, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multidrag.dart:196:6: Error: Getter not found: \'required\'. @required Object debugOwner, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multidrag.dart:196:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required Object debugOwner, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:44:22: Error: Getter not found: \'required\'. _CountdownZoned({ @required Duration duration }) ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:44:22: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. _CountdownZoned({ @required Duration duration }) ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:62:6: Error: Getter not found: \'required\'. @required PointerDownEvent event, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:62:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required PointerDownEvent event, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:64:6: Error: Getter not found: \'required\'. @required Duration doubleTapMinTime, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:64:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required Duration doubleTapMinTime, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/multitap.dart:81:49: Error: \'Matrix4\' isn\'t a type. void startTrackingPointer(PointerRoute route, Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:15:36: Error: \'Matrix4\' isn\'t a type. final Map<int, Map<PointerRoute, Matrix4>> _routeMap = <int, Map<PointerRoute, Matrix4>>{}; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:15:82: Error: \'Matrix4\' isn\'t a type. final Map<int, Map<PointerRoute, Matrix4>> _routeMap = <int, Map<PointerRoute, Matrix4>>{}; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:16:27: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> _globalRoutes = <PointerRoute, Matrix4>{}; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:16:67: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> _globalRoutes = <PointerRoute, Matrix4>{}; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:25:51: Error: \'Matrix4\' isn\'t a type. void addRoute(int pointer, PointerRoute route, [Matrix4 transform]) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:26:29: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> routes = _routeMap.putIfAbsent( ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:28:28: Error: \'Matrix4\' isn\'t a type. () => <PointerRoute, Matrix4>{}, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:43:29: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> routes = _routeMap[pointer]; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:56:44: Error: \'Matrix4\' isn\'t a type. void addGlobalRoute(PointerRoute route, [Matrix4 transform]) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:73:58: Error: \'Matrix4\' isn\'t a type. void _dispatch(PointerEvent event, PointerRoute route, Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:98:29: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> routes = _routeMap[event.pointer]; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:99:29: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> copiedGlobalRoutes = Map<PointerRoute, Matrix4>.from(_globalRoutes); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:99:77: Error: \'Matrix4\' isn\'t a type. final Map<PointerRoute, Matrix4> copiedGlobalRoutes = Map<PointerRoute, Matrix4>.from(_globalRoutes); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:104:27: Error: \'Matrix4\' isn\'t a type. Map<PointerRoute, Matrix4>.from(routes), ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:112:23: Error: \'Matrix4\' isn\'t a type. Map<PointerRoute, Matrix4> referenceRoutes, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:113:23: Error: \'Matrix4\' isn\'t a type. Map<PointerRoute, Matrix4> copiedRoutes, ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:115:47: Error: \'Matrix4\' isn\'t a type. copiedRoutes.forEach((PointerRoute route, Matrix4 transform) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/recognizer.dart:317:43: Error: \'Matrix4\' isn\'t a type. void startTrackingPointer(int pointer, [Matrix4 transform]) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/recognizer.dart:549:6: Error: Getter not found: \'required\'. @required this.local, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/recognizer.dart:549:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.local, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/recognizer.dart:550:6: Error: Getter not found: \'required\'. @required this.global, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/recognizer.dart:550:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.global, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/scale.dart:243:3: Error: \'Matrix4\' isn\'t a type. Matrix4 _lastTransform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:19:6: Error: Getter not found: \'required\'. @required this.pixelsPerSecond, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:19:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.pixelsPerSecond, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:97:6: Error: Getter not found: \'required\'. @required this.pixelsPerSecond, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:97:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.pixelsPerSecond, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:98:6: Error: Getter not found: \'required\'. @required this.confidence, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:98:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.confidence, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:99:6: Error: Getter not found: \'required\'. @required this.duration, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:99:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.duration, ^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:100:6: Error: Getter not found: \'required\'. @required this.offset, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/gestures/velocity_tracker.dart:100:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.offset, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:100:33: Error: Getter not found: \'required\'. const CustomSemanticsAction({@required this.label}) ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:100:33: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. const CustomSemanticsAction({@required this.label}) ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:110:50: Error: Getter not found: \'required\'. const CustomSemanticsAction.overridingAction({@required this.hint, @required this.action}) ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:110:50: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. const CustomSemanticsAction.overridingAction({@required this.hint, @required this.action}) ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:110:71: Error: Getter not found: \'required\'. const CustomSemanticsAction.overridingAction({@required this.hint, @required this.action}) ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:110:71: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. const CustomSemanticsAction.overridingAction({@required this.hint, @required this.action}) ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:182:6: Error: Getter not found: \'required\'. @required this.flags, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:182:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.flags, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:183:6: Error: Getter not found: \'required\'. @required this.actions, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:183:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.actions, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:184:6: Error: Getter not found: \'required\'. @required this.label, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:184:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.label, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:185:6: Error: Getter not found: \'required\'. @required this.increasedValue, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:185:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.increasedValue, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:186:6: Error: Getter not found: \'required\'. @required this.value, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:186:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.value, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:187:6: Error: Getter not found: \'required\'. @required this.decreasedValue, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:187:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.decreasedValue, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:188:6: Error: Getter not found: \'required\'. @required this.hint, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:188:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.hint, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:189:6: Error: Getter not found: \'required\'. @required this.textDirection, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:189:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.textDirection, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:190:6: Error: Getter not found: \'required\'. @required this.rect, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:190:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.rect, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:191:6: Error: Getter not found: \'required\'. @required this.elevation, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:191:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.elevation, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:192:6: Error: Getter not found: \'required\'. @required this.thickness, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:192:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.thickness, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:193:6: Error: Getter not found: \'required\'. @required this.textSelection, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:193:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.textSelection, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:194:6: Error: Getter not found: \'required\'. @required this.scrollIndex, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:194:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.scrollIndex, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:195:6: Error: Getter not found: \'required\'. @required this.scrollChildCount, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:195:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.scrollChildCount, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:196:6: Error: Getter not found: \'required\'. @required this.scrollPosition, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:196:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.scrollPosition, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:197:6: Error: Getter not found: \'required\'. @required this.scrollExtentMax, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:197:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.scrollExtentMax, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:198:6: Error: Getter not found: \'required\'. @required this.scrollExtentMin, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:198:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.scrollExtentMin, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:199:6: Error: Getter not found: \'required\'. @required this.platformViewId, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:199:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.platformViewId, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:200:6: Error: Getter not found: \'required\'. @required this.maxValueLength, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:200:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.maxValueLength, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:201:6: Error: Getter not found: \'required\'. @required this.currentValueLength, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:201:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.currentValueLength, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:345:9: Error: \'Matrix4\' isn\'t a type. final Matrix4 transform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:502:6: Error: Getter not found: \'required\'. @required SemanticsNode value, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:502:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required SemanticsNode value, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:503:6: Error: Getter not found: \'required\'. @required DiagnosticsTreeStyle style, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:503:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required DiagnosticsTreeStyle style, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:504:6: Error: Getter not found: \'required\'. @required this.childOrder, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:504:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.childOrder, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:1232:3: Error: \'Matrix4\' isn\'t a type. Matrix4 _transform; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:1233:17: Error: \'Matrix4\' isn\'t a type. set transform(Matrix4 value) { ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:1840:6: Error: Getter not found: \'required\'. @required SemanticsConfiguration config, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:1840:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required SemanticsConfiguration config, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2029:12: Error: Getter not found: \'Matrix4\'. return Matrix4.identity().storage; ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2299:6: Error: Getter not found: \'required\'. @required this.isLeadingEdge, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2299:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.isLeadingEdge, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2300:6: Error: Getter not found: \'required\'. @required this.offset, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2300:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.offset, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2301:6: Error: Getter not found: \'required\'. @required this.node, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2301:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.node, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2337:6: Error: Getter not found: \'required\'. @required this.startOffset, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2337:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.startOffset, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2338:6: Error: Getter not found: \'required\'. @required this.textDirection, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2338:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.textDirection, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2489:9: Error: \'Vector3\' isn\'t a type. final Vector3 vector = Vector3(point.dx, point.dy, 0.0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2489:26: Error: Method not found: \'Vector3\'. final Vector3 vector = Vector3(point.dx, point.dy, 0.0); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2559:6: Error: Getter not found: \'required\'. @required this.node, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2559:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.node, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2561:6: Error: Getter not found: \'required\'. @required this.position, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2561:6: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required this.position, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2699:13: Error: \'Matrix4\' isn\'t a type. final Matrix4 inverse = Matrix4.identity(); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:2699:31: Error: The getter \'Matrix4\' isn\'t defined for the class \'SemanticsOwner\'. - \'SemanticsOwner\' is from \'package:flutter/src/semantics/semantics.dart\' (\'/D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart\'). Try correcting the name to the name of an existing getter, or defining a getter or field named \'Matrix4\'. final Matrix4 inverse = Matrix4.identity(); ^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3968:4: Error: Getter not found: \'required\'. @required String thisString, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3968:4: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required String thisString, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3969:4: Error: Getter not found: \'required\'. @required String otherString, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3969:4: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required String otherString, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3970:4: Error: Getter not found: \'required\'. @required TextDirection thisTextDirection, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3970:4: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required TextDirection thisTextDirection, ^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3971:4: Error: Getter not found: \'required\'. @required TextDirection otherTextDirection, ^^^^^^^^ /D:/GitWork/flutter/packages/flutter/lib/src/semantics/semantics.dart:3971:4: Error: This can\'t be used as metadata; metadata should be a reference to a compile-time constant variable, or a call to a constant constructor. @required TextDirection otherTextDirection, ^ Target kernel_snapshot failed: Exception: Errors during snapshot creation: null build failed. FAILURE: Build failed with an exception. * Where: Script \'D:\\GitWork\\flutter\\packages\\flutter_tools\\gradle\\flutter.gradle\' line: 780 * What went wrong: Execution failed for task \':app:compileFlutterBuildDebug\'. > Process \'command \'D:\\GitWork\\flutter\\bin\\flutter.bat\'\' finished with non-zero exit value 1 * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 7s Running Gradle task \'assembleDebug\'... Running Gradle task \'assembleDebug\'... Done 18.9s Gradle task assembleDebug failed with exit code 1
检查flutter doctor也没有问题，这是由于之前建立的flutter工程是另外一个flutter SDK版本导致的，此时可以重新在当前flutter SDK上建立工程，或使用examples中自带的工程即可。
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