今天整理了一下代码，删了些无用代码和资源，优化了一下逻辑，然后打包想测试下，结果报错了：

  1. Java compiler:
  2.     error: failed linking file resources.

说实话，这个错就是说找不到资源引用，八成是误删了。不过详细 log 一般都会指明哪个资源有问题，见过了不少次了，内心很平静。
So，该看详细 log，找资源 ID 了，找到之后补回来，或者 git checkout 就可以了，就这么简单！

真就这么简单？？？

  1. org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:processDebugResources'.
  2.     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:103)
  3.     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:73)
  4.     at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
  5.     at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:59)
  6.     at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
  7.     at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:59)
  8.     at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:101)
  9.     at org.gradle.api.internal.tasks.execution.FinalizeInputFilePropertiesTaskExecuter.execute(FinalizeInputFilePropertiesTaskExecuter.java:44)
  10.     at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:91)
  11.     at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:62)
  12.     at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:59)
  13.     at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
  14.     at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
  15.     at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
  16.     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:256)
  17.     at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
  18.     at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
  19.     at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
  20.     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
  21.     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:249)
  22.     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:238)
  23.     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
  24.     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
  25.     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
  26.     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
  27.     at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:663)
  28.     at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:597)
  29.     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
  30.     at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
  31.     at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
  32.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  33.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  34.     at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
  35.     at java.lang.Thread.run(Thread.java:745)
  36. Caused by: org.gradle.tooling.BuildException: Failed to process resources, see aapt output above for details.
  37.     at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.invokeAaptForSplit(LinkApplicationAndroidResourcesTask.java:512)
  38.     at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.doFullTaskAction(LinkApplicationAndroidResourcesTask.java:249)
  39.     at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.java:106)
  40.     at sun.reflect.GeneratedMethodAccessor473.invoke(Unknown Source)
  41.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  42.     at java.lang.reflect.Method.invoke(Method.java:498)
  43.     at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
  44.     at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:50)
  45.     at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39)
  46.     at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26)
  47.     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:124)
  48.     at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
  49.     at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
  50.     at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
  51.     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
  52.     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:113)
  53.     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:95)
  54.     ... 33 more
  55.     Suppressed: java.lang.RuntimeException: Some file processing failed, see logs for details
  56.         at com.android.builder.internal.aapt.QueuedResourceProcessor.waitForAll(QueuedResourceProcessor.java:121)
  57.         at com.android.builder.internal.aapt.QueuedResourceProcessor.end(QueuedResourceProcessor.java:141)
  58.         at com.android.builder.internal.aapt.v2.QueueableAapt2.close(QueueableAapt2.java:104)
  59.         at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.doFullTaskAction(LinkApplicationAndroidResourcesTask.java:293)
  60.         ... 48 more
  61. Caused by: com.android.ide.common.process.ProcessException: Failed to execute aapt
  62.     at com.android.builder.core.AndroidBuilder.processResources(AndroidBuilder.java:809)
  63.     at com.android.builder.core.AndroidBuilder.processResources(AndroidBuilder.java:797)
  64.     at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.invokeAaptForSplit(LinkApplicationAndroidResourcesTask.java:491)
  65.     ... 49 more
  66. Caused by: java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: AAPT2 error: check logs for details
  67.     at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:503)
  68.     at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:482)
  69.     at com.google.common.util.concurrent.AbstractFuture$TrustedFuture.get(AbstractFuture.java:79)
  70.     at com.android.builder.internal.aapt.AbstractAapt.link(AbstractAapt.java:34)
  71.     at com.android.builder.core.AndroidBuilder.processResources(AndroidBuilder.java:807)
  72.     ... 51 more
  73. Caused by: java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: AAPT2 error: check logs for details
  74.     at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:503)
  75.     at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:462)
  76.     at com.google.common.util.concurrent.AbstractFuture$TrustedFuture.get(AbstractFuture.java:79)
  77.     at com.android.builder.internal.aapt.v2.QueueableAapt2.lambda$makeValidatedPackage$1(QueueableAapt2.java:166)
  78.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  79.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  80.     ... 1 more
  81. Caused by: com.android.builder.internal.aapt.v2.Aapt2Exception: AAPT2 error: check logs for details
  82.     at com.android.builder.png.AaptProcess$NotifierProcessOutput.handleOutput(AaptProcess.java:443)
  83.     at com.android.builder.png.AaptProcess$NotifierProcessOutput.err(AaptProcess.java:395)
  84.     at com.android.builder.png.AaptProcess$ProcessOutputFacade.err(AaptProcess.java:312)
  85.     at com.android.utils.GrabProcessOutput$1.run(GrabProcessOutput.java:104)

WTF，没找到报错的资源信息，不科学！！！
果然，当你在想当然的时候，现实总喜欢甩一巴掌过来！！！
难道是东西变动多，需要 clean 一下？
clean，rebulit，又又又报错了……

暂存修改，排查问题

因为修改的东西多，又没验证，不想提交，只能先 stash了。
而且这些文件都是 modified 状态，stash之后，就回到了能编过的正常状态了，不用再 checkout，也不用但心修改内容丢了。

果然，stash之后，编译过了……
既然前面报错是说资源找不到，那就按之前的操作，慢慢排查资源文件吧……

说白了，能排查的资源文件就哪几种：

  1. string，删了一些没用的
  2. drawable，没动
  3. mipmap，没动
  4. menu，就一个文件，没用，删了，连目录都删了
  5. dimens，没动
  6. styles，没动

这样初步筛查下来，就两个地方了，要么是 string，要么是 menu……
等等，之前删了 xml 之后，顺带把 menu 目录也删了，删的时候，整个 Project 的目录抖了一下，那会不会是删 menu 导致的？

验证，删了 menu.xml，删了 menu 目录，编译正常……
无语，看来只能是 string了……
[AS] failed linking file resources. - 图1
删 string 的时候，我整个 Module 搜索过，确实没有引用才删的，而且才删了2个string，就2个啊，怎么会错呢？！（项目 Module，非 lib，不存在被其它 Module 引用的可能）

  1. <string name="action_settings">设置</string>
  2. <string name="title_activity_qrscan">二维码扫描</string>

[AS] failed linking file resources. - 图2
再试一下，删了 action_settings，编译……

报错了！！！

到这里，问题找到了，可为什么删了没用的资源会报错呢？？？
[AS] failed linking file resources. - 图3