Execution failed for task ':app:compileDebugJ

摘要：注有关详细信息请使用重新编译。个错误原来是的找不到了彻底解决了可以在右侧找到对应的各种快捷键

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ":app:compileDebugJavaWithJavac".
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
    at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:745)

在AndroidStudio(mac os)的terminal中输入命令

./gradlew compileDebug --stacktrace

windows下输入

gradlew compileDebug --stacktrace

查看日志

    * What went wrong:
Task "compileDebug" is ambiguous in root project "DefineViewStudy". Candidates are: "compileDebugAidl", "compileDebugAndroidTestAidl", "compileDebugAndroidTestJavaWithJavac", "compileDebugAndroidTestNdk", "compileDebugAndroidTestRenderscript", "compileDebugAndroidTestShaders", "compileDebugAndroidTestSources", "compileDebugJavaWithJavac", "compileDebugNdk", "compileDebugRenderscript", "compileDebugShaders", "compileDebugSources", "compileDebugUnitTestJavaWithJavac", "compileDebugUnitTestSources".

* Try:
Run gradlew tasks to get a list of available tasks. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.execution.TaskSelectionException: Task "compileDebug" is ambiguous in root project "DefineViewStudy". Candidates are: "compileDebugAidl", "compileDebugAndroidTestAidl", "compileDebugAndroidTestJavaWithJavac", "compileDebugAndroidTestNdk", "compileDebugAndroidTestRenderscript", "compileDebugAndroidTestShaders", "compileDebugAndroidTestSources", "compileDebugJavaWithJavac", "compileDebugNdk", "compileDebugRenderscript", "compileDebugShaders", "compileDebugSources", "compileDebugUnitTestJavaWithJavac", "compileDebugUnitTestSources".

注意到这句话Task "compileDebug" is ambiguous in root project "DefineViewStudy". 单词
ambiguous是模糊不清的意思.尝试着把命令改为

./gradlew compileDebugJavaWithJavac

windows下输入

gradlew compileDebugJavaWithJavac

这次打印的信息很明了了.

    /Users/xxx/work/workspace/github/DefineViewStudy/app/src/main/java/com/idealcn/define/view/ui/MainFragment.java:70: 错误: 找不到符号
            case R.id.round_cake:
                     ^
  符号:   变量 round_cake
  位置: 类 id
/Users/guoning/work/workspace/github/DefineViewStudy/app/src/main/java/com/idealcn/define/view/ui/MainFragment.java:74: 错误: 找不到符号
            case R.id.drag:
                     ^
  符号:   变量 drag
  位置: 类 id
注: 某些输入文件使用或覆盖了已过时的 API。
注: 有关详细信息, 请使用 -Xlint:deprecation 重新编译。
2 个错误

原来是view的id找不到了.彻底解决了!

可以在Android-studio右侧找到gradlew对应的各种快捷键