我得到这个错误，而我正在构建APK。
Cause 1: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
at org.gradle.workers.internal.DefaultWorkerExecutor$WorkerExecution.waitForCompletion(DefaultWorkerExecutor.java:285)
at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:115)
at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForCompletion(DefaultAsyncWorkTracker.java:87)
at org.gradle.workers.internal.DefaultWorkerExecutor.await(DefaultWorkerExecutor.java:150)
at com.android.build.gradle.internal.tasks.Workers$WorkerExecutorAdapter.await(Workers.kt:282)
at com.android.ide.common.resources.MergeWriter.end(MergeWriter.java:48)
at com.android.ide.common.resources.MergedResourceWriter.end(MergedResourceWriter.java:242)
at com.android.ide.common.resources.DataMerger.mergeData(DataMerger.java:292)
at com.android.ide.common.resources.ResourceMerger.mergeData(ResourceMerger.java:384)
at com.android.build.gradle.tasks.MergeResources.lambda$doFullTaskAction$1(MergeResources.java:261)
at com.android.build.gradle.internal.tasks.Blocks.recordSpan(Blocks.java:58)
试图使缓存无效并重新启动android工作室。重建项目，但没有一个为我工作。
在android文件夹根的本地属性中设置最小sdk版本为21:
flutter.minSdkVersion=21
在app->build.gradle中
defaultConfig {
[...]
minSdkVersion localProperties.getProperty('flutter.minSdkVersion').toInteger()
根据文件:
注意:当针对Android SDK 21或更高版本时，Multidex支持是原生的。
他们还谨慎地警告说:
但是，不建议仅仅针对API 21+来解决多重索引问题，因为这可能会无意中排除运行旧设备的用户。
但是SDK 21在10年前就发布了Android版本5,0 Lollipop，如你所见:https://en.wikipedia.org/wiki/Android_Lollipop(更不用说这些设备，如果它们仍然存在，通常有能力升级他们的Android版本)。
当你试图构建一个使用VectorDrawable作为自适应图标的应用程序时，你可能会遇到这样的错误。和你的XML文件包含"android:fillColor"与<梯度>块:
res - drawable icon_with_gradient xml。
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:aapt="http://schemas.android.com/aapt"
android:width="96dp"
android:height="96dp"
android:viewportHeight="100"
android:viewportWidth="100">
<path
android:pathData="M1,1 H99 V99 H1Z"
android:strokeColor="?android:attr/colorAccent"
android:strokeWidth="2">
<aapt:attr name="android:fillColor">
<gradient
android:endColor="#156a12"
android:endX="50"
android:endY="99"
android:startColor="#1e9618"
android:startX="50"
android:startY="1"
android:type="linear" />
</aapt:attr>
</path>
</vector>
渐变填充颜色通常用于自适应图标，例如在教程中这里，这里和这里。
即使布局预览工作正常，当你构建应用程序时，你会看到这样的错误:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeDebugResources'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> Error while processing Project/app/src/main/res/drawable/icon_with_gradient.xml : null
(More info shown when the gradle build is run with --stack-trace flag):
Caused by: java.lang.NullPointerException
at com.android.ide.common.vectordrawable.VdPath.addGradientIfExists(VdPath.java:614)
at com.android.ide.common.vectordrawable.VdTree.parseTree(VdTree.java:149)
at com.android.ide.common.vectordrawable.VdTree.parse(VdTree.java:129)
at com.android.ide.common.vectordrawable.VdParser.parse(VdParser.java:39)
at com.android.ide.common.vectordrawable.VdPreview.getPreviewFromVectorXml(VdPreview.java:197)
at com.android.builder.png.VectorDrawableRenderer.generateFile(VectorDrawableRenderer.java:224)
at com.android.build.gradle.tasks.MergeResources$MergeResourcesVectorDrawableRenderer.generateFile(MergeResources.java:413)
at com.android.ide.common.resources.MergedResourceWriter$FileGenerationWorkAction.run(MergedResourceWriter.java:409)
解决方案是将文件icon_with_gradient.xml移动到drawable-v24/icon_with_gradient.xml或drawable-v26/icon_with_gradient.xml。这是因为梯度填充只在API 24 (Android 7)及以上版本中支持。VectorDrawable:无效的可绘制标签梯度
