版权声明：本文为【欧阳鹏】原创文章，欢迎转载，转载请注明出处! 【http://blog.csdn.net/ouyang_peng】 https://blog.csdn.net/qq446282412/article/details/82590820
一、问题描述
今天在编写代码过程中，引入了一个组内新的封装库，导致编译冲突。如下所示：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':demo:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
BUILD FAILED in 8s
51 actionable tasks: 13 executed, 38 up-to-date
点击 【Run with --stacktrace】 ，重新编译查看详细信息，如下：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':demo:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
* Try:
Run with --info or --debug option to get more log output.
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':demo:transformDexArchiveWithExternalLibsDexMergerForDebug'.
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$1.run(ManagedExecutorImpl.java:46)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
at com.android.builder.dexing.DxDexArchiveMerger.mergeMonoDex(DxDexArchiveMerger.java:177)
at com.android.builder.dexing.DxDexArchiveMerger.mergeDexArchives(DxDexArchiveMerger.java:118)
at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:97)
at com.android.build.gradle.internal.transforms.ExternalLibsMergerTransform.transform(ExternalLibsMergerTransform.kt:121)
at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:222)
at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:218)
at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)
at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:213)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:46)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
... 29 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
at com.android.builder.dexing.DxDexArchiveMerger.lambda$mergeMonoDex$0(DxDexArchiveMerger.java:171)
Caused by: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
Caused by: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:72)
at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:36)
Caused by: com.android.dex.DexException: Multiple dex files define Landroid/support/v4/app/TaskStackBuilder$SupportParentable;
at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:661)
at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:616)
at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:598)
at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)
at com.android.dx.merge.DexMerger.merge(DexMerger.java:198)
at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:61)
... 1 more
* Get more help at https://help.gradle.org
BUILD FAILED in 6s
51 actionable tasks: 5 executed, 46 up-to-date
告诉我因为 Multiple dex files define Landroid/support/v4/app/TaskStackBuilder$SupportParentable; 有多个 相同的 TaskStackBuilder 类导致编译不了的。
其他的support包都是27.1.1，这个support-v4-23.2.1，从哪里来的？
我们代码的build.gradle文件中，都搜索不到23.2.1 是从哪里来的。我的代码中根本就没有地方引用这个版本的support-v4-23.2.1，那么我们该如何查找这个这个版本的support-v4-23.2.1到底是在哪里引入的呢？？？
二、如何快速查看Gradle项目包依赖情况？
通过上面的问题，我们想查找这个这个版本的support-v4-23.2.1到底是在哪里引入的，就必须得把项目的gradle依赖树的情况获知，如何获知android项目的gradle依赖呢？？可以通过以下几种方式来获知。
2.1 执行命令 ./gradlew 模块名：dependencies
比如我的项目是 demo工程编译失败的，所以我们执行命令
gradlew :demo:dependencies
执行命令之后的输出日志如下所示，因为日志太多，截取部分：
+--- com.xtc.data:data-new-sqlcipher:1.0.2
| +--- net.zetetic:android-database-sqlcipher:3.5.7
| \--- com.j256.ormlite:ormlite-core:4.48
\--- com.xtc.phone:data-phone:1.1.8
+--- com.android.support:appcompat-v7:27.1.1 (*)
+--- com.android.support:support-annotations:27.1.1
+--- io.reactivex:rxandroid:1.2.1 (*)
+--- com.facebook.fresco:fresco:0.12.0
| +--- com.facebook.fresco:drawee:0.12.0
| | +--- com.android.support:support-v4:23.2.1
| | | \--- com.android.support:support-annotations:23.2.1 -> 27.1.1
| | \--- com.facebook.fresco:fbcore:0.12.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:imagepipeline:0.12.0
| +--- com.android.support:support-v4:23.2.1 (*)
| +--- com.facebook.fresco:imagepipeline-base:0.12.0
| | +--- com.android.support:support-v4:23.2.1 (*)
| | +--- com.parse.bolts:bolts-tasks:1.4.0
| | +--- com.nineoldandroids:library:2.4.0
| | \--- com.facebook.fresco:fbcore:0.12.0
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.nineoldandroids:library:2.4.0
| \--- com.facebook.fresco:fbcore:0.12.0
+--- com.facebook.fresco:animated-gif:0.12.0
| +--- com.android.support:support-v4:23.2.1 (*)
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:animated-base:0.12.0
| +--- com.android.support:support-v4:23.2.1 (*)
| +--- com.facebook.fresco:imagepipeline-base:0.12.0 (*)
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:imagepipeline:0.12.0 (*)
\--- com.facebook.fresco:imagepipeline-okhttp3:0.12.0
+--- com.squareup.okhttp3:okhttp:3.0.1 -> 3.4.1 (*)
+--- com.facebook.fresco:fbcore:0.12.0
\--- com.facebook.fresco:imagepipeline:0.12.0 (*)
由上面的依赖树我们可以看出来，
com.android.support:support-v4:23.2.1 被 com.facebook.fresco:fresco:0.12.0、com.facebook.fresco:animated-gif:0.12.0引用了。而这两个库又被com.xtc.phone:data-phone:1.1.8引用了。
所以我们在引用com.xtc.phone:data-phone:1.1.8的地方，将com.android.support:support-v4:23.2.1exclude掉即可正常编译。如下所示：
将
implementation libraries.data_phone
修改为以下即可。
//implementation libraries.data_phone
//data_phone里面的fresco包含了com.android.support:support-v4:23.2.1
implementation (libraries.data_phone){
exclude group: 'com.android.support', module: 'support-v4'
}
如果是直接依赖本地的project的话，也是可以进行exclude，只是需要在project 外面再包一层，写成如下所示：
从
implementation project(':phone')
改为
//data_phone里面的fresco包含了com.android.support:support-v4:23.2.1
implementation (project(':phone')){
exclude group: 'com.android.support', module: 'support-v4'
}
重新编译，查看下依赖关系。
\--- com.xtc.phone:data-phone:1.1.8
+--- com.android.support:appcompat-v7:27.1.1 (*)
+--- com.android.support:support-annotations:27.1.1
+--- io.reactivex:rxandroid:1.2.1 (*)
+--- com.facebook.fresco:fresco:0.12.0
| +--- com.facebook.fresco:drawee:0.12.0
| | \--- com.facebook.fresco:fbcore:0.12.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:imagepipeline:0.12.0
| +--- com.facebook.fresco:imagepipeline-base:0.12.0
| | +--- com.parse.bolts:bolts-tasks:1.4.0
| | +--- com.nineoldandroids:library:2.4.0
| | \--- com.facebook.fresco:fbcore:0.12.0
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.nineoldandroids:library:2.4.0
| \--- com.facebook.fresco:fbcore:0.12.0
+--- com.facebook.fresco:animated-gif:0.12.0
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:animated-base:0.12.0
| +--- com.facebook.fresco:imagepipeline-base:0.12.0 (*)
| +--- com.parse.bolts:bolts-tasks:1.4.0
| +--- com.facebook.fresco:fbcore:0.12.0
| \--- com.facebook.fresco:imagepipeline:0.12.0 (*)
\--- com.facebook.fresco:imagepipeline-okhttp3:0.12.0
+--- com.squareup.okhttp3:okhttp:3.0.1 -> 3.4.1 (*)
+--- com.facebook.fresco:fbcore:0.12.0
\--- com.facebook.fresco:imagepipeline:0.12.0 (*)
移除了重复类之后，正常编译。
2.2 通过Android Studio右侧的Gradle面板上的dependencies命令
如果上面的命令方式你不习惯，你可以通过Android Studio右侧的Gradle面板上的dependencies命令执行，如下所示
如上图，找到【 demo】工程，展开，然后找到【help】目录，找到【dependencies】命令，点击即可执行命令。如下所示
2.3 执行 gradlew build --scan 命令，生成
如果你嫌在命令行窗口展示观看不友好，这里还有一种体验更好的方式。
输入下面命令行：gradlew build --scan
编译完成的时候，出现输入框，提示我们输入 yes或者no
Do you accept the Gradle Cloud Services license agreement (https://gradle.com/terms-of-service)? [yes, no]
我们输入yes，然后继续
Do you accept the Gradle Cloud Services license agreement (https://gradle.com/terms-of-service)? [yes, no]
yes
Gradle Cloud Services license agreement accepted.
Publishing build scan...
https://gradle.com/s/paiitjk7aaiqa
C:\CodeForAndroid\BigData>
我们打开上面生成的链接： https://gradle.com/s/paiitjk7aaiqa，然后登陆网站即可。
登陆网站，然后查看具体的信息，如下所示：
登陆邮箱，查看刚才收到的邮件，如下所示：
2.4 通过 gradle view 插件查看gradle依赖树
如下图所示，在Settings --> Plugins中，搜索 gradle view插件并安装，下图是我已经安装好的截图。
搜索不到的，可以直接去 http://plugins.jetbrains.com 网站搜索，然后下载
http://plugins.jetbrains.com/plugin/7150-gradle-view 下载，如下所示
第一次安装完后，需要重启Android Studio ,重启之后我们来使用gradle view 插件
如上图，找到View–>Tools Windows-Gradle View ，然后点击即可执行。
三 总结
上面我介绍了四种查看Gradle项目依赖树的情况的方法，你们可以自己选择自己喜欢的。个人觉得插件还是最好用的。
作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！
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