Flutter 开发错误集合

Be honest rather clever.
诚实比聪明更要紧。

fluttercontactpicker: ^2.0.0 通讯录插件使用异常

 android Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference

 解决方案:

Flutter SDK 版本更新到最新

如果用命令更新失败,那么可以直接下载sdk压缩包进行解压后替换以前原有的sdk.

io.flutter.embedding.engine.FlutterEngine@7bd534e

W/FlutterEnginePluginRegistry( 4322): Attempted to register plugin (io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry$ShimRegistrarAggregate@d001e49) but it was already registered with this Flutte
rEngine (io.flutter.embedding.engine.FlutterEngine@7bd534e).

大概意思：早注册了FlutterEngine

解决方案：

删除 GeneratedPluginRegistrant.registerWith(flutterEngine);

 Xcode The sandbox is not in sync with the Podfile.lock.

The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.

解决方案：

Android Studio 执行命令flutter build ios

Cannot fit requested classes in a single dex file (# methods: 68807 > 65536)

Running Gradle task 'assembleDebug'...
D8: Cannot fit requested classes in a single dex file (# methods: 68807 > 65536)

com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives:

The number of method references in a .dex file cannot exceed 64K.

D8: Cannot fit requested classes in a single dex file (# methods: 65671 > 65536)
com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
The number of method references in a .dex file cannot exceed 64K.       
Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html
        at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:132)
        at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:119)
        at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:102)
        at com.android.build.gradle.internal.tasks.DexMergingTaskRunnable.run(DexMergingTask.kt:445)
        at com.android.build.gradle.internal.tasks.Workers$ActionFacade.run(Workers.kt:348)
        at org.gradle.workers.internal.AdapterWorkAction.execute(AdapterWorkAction.java:50)
        at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:47)
        at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:65)
        at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:61)
        at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:98)
        at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.execute(NoIsolationWorkerFactory.java:61)
        at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
        at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
        at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:56)
        at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:215)
        at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:210)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)     
        at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:215)
        at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:164)
        at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:131)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)     
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
        at java.lang.Thread.run(Thread.java:748)                        
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete
        at com.android.tools.r8.utils.O.a(:65)                          
        at com.android.tools.r8.D8.run(:11)                             
        at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:117)
        ... 34 more                                                     
Caused by: com.android.tools.r8.utils.b: Error: null, Cannot fit requested classes in a single dex file (# methods: 65671 > 65536)
        at com.android.tools.r8.utils.y0.a(:21)                         
        at com.android.tools.r8.dex.K.a(:56)                            
        at com.android.tools.r8.dex.K$h.a(:5)                           
        at com.android.tools.r8.dex.b.b(:15)                            
        at com.android.tools.r8.dex.b.a(:38)                            
        at com.android.tools.r8.D8.d(:87)                               
        at com.android.tools.r8.D8.b(:1)                                
        at com.android.tools.r8.utils.O.a(:30)                          
        ... 36 more                                                     
                                                                        
                                                                        
FAILURE: Build failed with an exception.                                
                                                                        
* What went wrong:                                                      
Execution failed for task ':app:mergeDexDebug'.                         
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
   > com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
     The number of method references in a .dex file cannot exceed 64K.  
     Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html
                                                                        
* 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

 解决方案：参考

build.gradle下配置修改

defaultConfig {
   ......

   multiDexEnabled true

   ......
}

dependencies {
    ......

    implementation 'com.android.support:multidex:1.0.3'

    ......
}

Attribute provider#androidx.core.content.FileProvider@authorities

Attribute meta-data#android.support.FILE_PROVIDER_PATHS@resource value=(@xml/file_paths) 

 <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.android.demo.fileProvider"
            android:exported="false"
            android:grantUriPermissions="true"
            >
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

 Attribute provider#androidx.core.content.FileProvider@authorities value=(com.android.demo.fileProvider) from AndroidManifest.xml:58:13-64

        is also present at [:flutter_webview_plugin] AndroidManifest.xml:11:13-64 value=(com.android.demo.fileprovider).

        Suggestion: add 'tools:replace="android:authorities"' to <provider> element at AndroidManifest.xml to override.

 Attribute meta-data#android.support.FILE_PROVIDER_PATHS@resource value=(@xml/file_paths) from AndroidManifest.xml:53:17-55

        is also present at [:flutter_webview_plugin] AndroidManifest.xml:17:17-50 value=(@xml/filepaths).

        Suggestion: add 'tools:replace="android:resource"' to <meta-data> element at AndroidManifest.xml to override.

解决方案：

 <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.android.demo.fileProvider"
            android:exported="false"
            tools:replace="android:authorities"
            android:grantUriPermissions="true"
            >
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                tools:replace="android:resource"
                android:resource="@xml/file_paths" />
        </provider>

The overflowing RenderFlex has an orientation of Axis.vertical.
e.g. using an Expanded widget 

@override
  Widget build(BuildContext context) {
    ScreenUtil.init(context, width: 750, height: 1624, allowFontScaling: true);
    return Scaffold(
      backgroundColor: scaffoldBackColor(),
    
      body: isSv ? getBaseViewNoSv(context) : getBaseView(context),
    );
  }

I/flutter (26133): The overflowing RenderFlex has an orientation of Axis.vertical.
I/flutter (26133): The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
I/flutter (26133): black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
I/flutter (26133): Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
I/flutter (26133): RenderFlex to fit within the available space instead of being sized to their natural size.
I/flutter (26133): This is considered an error condition because it indicates that there is content that cannot be
I/flutter (26133): seen. If the content is legitimately bigger than the available space, consider clipping it with a
I/flutter (26133): ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
I/flutter (26133): like a ListView.
I/flutter (26133): The specific RenderFlex in question is: RenderFlex#c0a57 relayoutBoundary=up3 OVERFLOWING:
I/flutter (26133):   needs compositing
I/flutter (26133):   creator: Column ← _PointerListener ← Listener ← _GestureSemantics ← RawGestureDetector ←
I/flutter (26133):     GestureDetector ← _BodyBuilder ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ←
I/flutter (26133):     CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← ⋯
I/flutter (26133):   parentData: <none> (can use size)
I/flutter (26133):   constraints: BoxConstraints(0.0<=w<=411.4, 0.0<=h<=441.5)
I/flutter (26133):   size: Size(411.4, 441.5)
I/flutter (26133):   direction: vertical
I/flutter (26133):   mainAxisAlignment: start
I/flutter (26133):   mainAxisSize: max
I/flutter (26133):   crossAxisAlignment: center
I/flutter (26133):   verticalDirection: down
I/flutter (26133): ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤

 解决方案 : 

resizeToAvoidBottomPadding: false

@override
  Widget build(BuildContext context) {
    ScreenUtil.init(context, width: 750, height: 1624, allowFontScaling: true);
    return Scaffold(
      backgroundColor: scaffoldBackColor(),
      resizeToAvoidBottomPadding: false,
      body: isSv ? getBaseViewNoSv(context) : getBaseView(context),
    );
  }

AnimationControllers should be disposed by calling dispose() on the AnimationController itself. 

class CurWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => CurWidgetState();
}

class CurWidgetState extends State<CurWidget>
    with TickerProviderStateMixin {
  AnimationController controller;
  Animation<double> animation;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    controller =
        AnimationController(duration: const Duration(seconds: 4), vsync: this);
    animation = Tween(begin: 0.0, end: 1.0).animate(controller);
    animation.addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        ///评估完成

      }
    });
    controller.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Padding(
          padding: ViewUtils.mp(20.0, 20.0, 20.0, 20.0),
          child: Image.asset(R.assetsImgIcEvaluateProcessTop),
        ),
        ViewUtils.commTextEll(
            '额度评估中……', 0xff000000, 16.0, FontWeight.normal, TextAlign.center),
        Container(
          padding: ViewUtils.mp(0.0, 20.0, 0.0, 40.0),
          child: RotationTransition(
            //设置动画的旋转中心
            alignment: Alignment.center,
            //动画控制器
            turns: animation,
            //将要执行动画的子view
            child: Image.asset(
              R.assetsImgIcEvaluateProgressAnimation,
              alignment: Alignment.center,
            ),
          ),
        ),
      ],
    );
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    if (controller != null) {
      controller.dispose();
    }
  }
}

Reloaded 0 of 947 libraries in 1,515ms.
I/chatty  ( 9839): uid=10133(com.example.market) 1.ui identical 2 lines
I/flutter ( 9839): AppInfo  v  TopBannerWidget_build
I/flutter ( 9839): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 9839): The following assertion was thrown while finalizing the widget tree:
I/flutter ( 9839): EvaProWidgetState#0f3c5(tickers: tracking 1 ticker) was disposed with an active Ticker.
I/flutter ( 9839): EvaProWidgetState created a Ticker via its TickerProviderStateMixin, but at the time dispose() was
I/flutter ( 9839): called on the mixin, that Ticker was still active. All Tickers must be disposed before calling
I/flutter ( 9839): super.dispose().
I/flutter ( 9839): Tickers used by AnimationControllers should be disposed by calling dispose() on the
I/flutter ( 9839): AnimationController itself. Otherwise, the ticker will leak.
I/flutter ( 9839): The offending ticker was:
I/flutter ( 9839):   _WidgetTicker(created by EvaProWidgetState#0f3c5(lifecycle state: created, tickers: tracking 0
I/flutter ( 9839):   tickers))
I/flutter ( 9839):   The stack trace when the _WidgetTicker was actually created was:

解决方案

@override
  void dispose() {
    // TODO: implement dispose
    if (controller != null) {
      controller.dispose();
    }
    super.dispose();
  }

pull_to_refresh

No named parameter with the name 'keyboardDismissBehavior'

解决方案