摘要：注有關詳細信息請使用重新編譯。個錯誤原來是的找不到了徹底解決了可以在右側找到對應的各種快捷鍵

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中輸入命令

./gradlew compileDebug --stacktrace

windows下輸入

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".

注意到這句話Task "compileDebug" is ambiguous in root project "DefineViewStudy". 單詞
ambiguous是模糊不清的意思.嘗試著把命令改為

./gradlew compileDebugJavaWithJavac

windows下輸入

gradlew compileDebugJavaWithJavac

這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: 錯誤: 找不到符號
            case R.id.round_cake:
                     ^
  符號:   變量 round_cake
  位置: 類 id
/Users/guoning/work/workspace/github/DefineViewStudy/app/src/main/java/com/idealcn/define/view/ui/MainFragment.java:74: 錯誤: 找不到符號
            case R.id.drag:
                     ^
  符號:   變量 drag
  位置: 類 id
注: 某些輸入文件使用或覆蓋了已過時的 API。
注: 有關詳細信息, 請使用 -Xlint:deprecation 重新編譯。
2 個錯誤

原來是view的id找不到了.徹底解決了!

可以在Android-studio右側找到gradlew對應的各種快捷鍵