小编odi*_*ity的帖子

我正在尝试在我们的 Android 项目中升级到 Kotlin 4.1，但它在 kaptDebugKotlin 步骤中引发了一个模糊的错误。在 kotlin 版本上一切正常1.3.72

我正在使用：

classpath "com.android.tools.build:gradle:4.0.1"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10"

这是来自的堆栈跟踪 ./gradlew assebleDebug --stacktrace

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptDebugKotlin'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:205)
        at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:203)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:184)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109)
        at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
        at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:372)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
        at …

我有一个非常简单的 MotionLayout，我正在尝试以编程方式更改其中一个约束的可见性，并让视图反映该更改。但是，直到我从当前状态过渡然后再回到它时，更改才会反映出来。你如何让视图根据新的约束立即更新？我试过updateState()，rebuildScene()和invalidate()但他们都不做任何事情。

这是视图：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.motion.widget.MotionLayout
        android:id="@+id/motion_layout"
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:showIn="@layout/activity_main"
        app:layoutDescription="@xml/motion_scene"
        tools:context=".MainActivity">

    <TextView
            android:id="@+id/left_to_right_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Left to right"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

    <TextView
            android:id="@+id/top_to_bottom_text"
            android:text="Top to bottom"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.motion.widget.MotionLayout>

这是运动场景：

<?xml version="1.0" encoding="utf-8"?>
<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:app="http://schemas.android.com/apk/res-auto">


    <Transition
            app:constraintSetStart="@id/base"
            app:constraintSetEnd="@id/bottom">
        <OnClick
                app:targetId="@id/top_to_bottom_text">

        </OnClick>

    </Transition>

    <Transition
            app:constraintSetStart="@id/base"
            app:constraintSetEnd="@id/right">
        <OnSwipe
                app:dragDirection="dragRight"
                app:touchAnchorId="@id/left_to_right_text"
                app:touchAnchorSide="right">

        </OnSwipe>

    </Transition>


    <ConstraintSet android:id="@+id/base">

        <Constraint
                android:id="@id/left_to_right_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent"/>

        <Constraint
                android:id="@id/top_to_bottom_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" …

我无法让 Ktor 在 KMM 项目中工作，我只是Unresolved reference: HttpClient在尝试引用任何 Ktor 类时收到错误。如果我尝试手动添加 ktor 导入，它会显示Unresolved reference io. 其他依赖项（如Kermit解析良好）似乎只是 Ktor 存在问题。这是我重现的简单步骤：

1. 在 Android Studio 中（我尝试过 4.1.3 和 4.2 Beta 6），我转到文件 -> 新建 -> KMM 应用程序。

2. 在共享模块 build.gradle.kts 中，我添加了 ktor 客户端的依赖项：

val commonMain by getting {
        dependencies {
            implementation("io.ktor:ktor-client-core:1.5.2")
        }
     }

3. 在commonMain 的类中，我尝试创建一个 HttpClient，就像 Ktor 文档https://kotlinlang.org/docs/mobile/use-ktor-for-networking.html#select-an-engineGreeting中所述：

class Greeting {
    val httpClient: HttpClient = HttpClient()

    fun greeting(): String {
        return "Hello, ${Platform().platform}!"
    }
}

我明白了Unresolved reference: HttpClient …

minifyEnabled目前，我的 UI 测试在调试版本设置为 false 时运行良好。然而，我希望能够使用 minifyEnabled 运行我们的 UI 测试，但我收到错误：

java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/LazyKt;
at com.myapp.android.helpers.BaseUITest.<init>(BaseUITest.kt:89)
at com.myapp.android.helpers.BaseLoggedInUITest.<init>(BaseUITest.kt:58)
at com.myapp.android.BookingTest.<init>(BookingTest.kt:25)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:217)
at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:266)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at androidx.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
at androidx.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:392)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2189)
Caused by: java.lang.ClassNotFoundException: Didn't …

免责声明：我已经找到了解决此问题的方法，但由于我花了很长时间才弄清楚它为什么会发生，所以我想将问题和答案发布给其他人。

我遇到一个奇怪的问题：在夜间模式下打开应用程序时，某些UI会以正确的夜间模式颜色加载，而某些UI会以正常颜色加载。

我在我的应用程序中使用 CachedNetworkImage，当我在 Android 上的调试或发布中运行它时它工作正常，但是当我将 aab 上传到 Play 商店并从 Play 商店下载应用程序时，图像只是卡在占位符上.

这是我在应用程序中使用它的方式。请注意，我为占位符和错误使用了 Text 小部件，以便我可以直观地调试发布版本上的任何问题：

child: Stack(
          children: <Widget>[
            url != null
                ? CachedNetworkImage(
              imageUrl: url,
              errorWidget: (context, url, error) => Text("$error"),
              placeholder: (context, url) => Text("Loading $url"),
              imageBuilder: (context, imageProvider) => Container(
                width: double.infinity,
                height: 150,
                decoration: BoxDecoration(
                  image: DecorationImage(image: imageProvider, fit: BoxFit.fitWidth),
                ),
              ),
            )
                : Container(),

它只是停留在占位符上，看起来像这样

我在 pubspec 中使用了最新版本的 cached_network_image：

cached_network_image: ^2.4.1

到目前为止，这是我尝试帮助缩小问题范围的方法：

1. 使用Image.network(url)CachedNetworkImage 代替。当我这样做时，图像加载得很好，所以我知道这不是互联网或 url 的问题。
2. 使用flutter run --release. 这工作正常，图像加载正确。
3. 尝试多种设备。我尝试在 Android 8 …