Android Motionlayout：Android 资源链接失败

Question

在重构到motionlayout 2.0.0-beta1 后，我不断收到构建错误（我知道这不是最新版本——beta2 会产生相同的错误）。

这是堆栈跟踪：

AAPT: /Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6514: error: resource attr/flow_horizontalSeparator (aka com.example:attr/flow_horizontalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6514: error: resource attr/flow_verticalSeparator (aka com.example:attr/flow_verticalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6515: error: resource attr/flow_horizontalSeparator (aka com.example:attr/flow_horizontalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6515: error: resource attr/flow_verticalSeparator (aka com.example:attr/flow_verticalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6517: error: resource attr/flow_horizontalSeparator (aka com.example:attr/flow_horizontalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6517: error: resource attr/flow_verticalSeparator (aka com.example:attr/flow_verticalSeparator) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6517: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6860: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6861: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6876: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6877: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:6877: error: resource attr/waveDecay (aka com.example:attr/waveDecay) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:7288: error: resource attr/motionPathRotate (aka com.example:attr/motionPathRotate) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:7290: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:7549: error: resource attr/motionProgress (aka com.example:attr/motionProgress) not found.
/Users/TBS/StudioProjects/ExampleApp/app/build/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:8270: error: resource attr/duration (aka com.example:attr/duration) not found.
error: failed linking references.

没有关于哪个文件产生错误的迹象，据我所知，我没有在我的项目中的任何地方使用任何这些属性。

Answer 1

此问题与 Android Studio 3.6 和早于 2.0.0-beta3 的 ConstraintLayout 版本有关 - 我已在此处报告该问题。 这在 ConstraintLayout 2.0.0-beta3 中得到修复。

Android Studio 3.5 不会产生此错误。

要使其在 AS 3.6 beta 中工作，请升级到 ConstraintLayout 2.0.0-beta3 或更高版本。

Answer 2

如果即使升级ConstraintLayout也无济于事，请尝试将format属性添加到attrs.xml文件中的attr声明中。

<resources>
    <attr name="yourAttrName" format="string" />
</resources>

为您的属性选择正确的格式。

Answer 3

升级到constraintlayout:2.0.0-beta4，为我工作，或更高版本。 将 android studio 升级到 3.6 后会发生这种情况

Answer 4

我将 gradle 版本升级到com.android.tools.build:gradle:3.6.0然后遇到了这个问题，只需将 gradle 版本降级到com.android.tools.build:gradle:3.5.3问题就解决了

Answer 5

你必须做两件事：

1. 更新你的安卓工作室。

2. 添加最新的依赖实现

   'androidx.constraintlayout:constraintlayout:2.0.0-rc1'