Android无法运行教程应用程序。任务执行失败“：app:dexDebug”。jdk1.8.0_25\bin\java.exe‘以非零出口值2完成

Question

我是Android的新手，所以在解释潜在的解决方案时请讲清楚，我不熟悉这个环境。

由于某些原因，当我运行一个示例应用程序时，构建总是会失败，只有一个例外。Gradle控制台总是在运行时显示以下消息：

AGPBI: {"kind":"SIMPLE","text":"UNEXPECTED TOP-LEVEL EXCEPTION:","position":
    {},"original":"UNEXPECTED TOP-LEVEL EXCEPTION:"}
    AGPBI: {"kind":"SIMPLE","text":"com.android.dex.DexException: Multiple dex files define Landroid/support/v4/view/PagerAdapter;","position":{},"original":"com.android.dex.DexException: Multiple dex files define Landroid/support/v4/view/PagerAdapter;"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)","position":{},"original":"\tat com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)","position":{},"original":"\tat com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)","position":{},"original":"\tat com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)","position":{},"original":"\tat com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.merge(DexMerger.java:189)","position":{},"original":"\tat com.android.dx.merge.DexMerger.merge(DexMerger.java:189)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)","position":{},"original":"\tat com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)","position":{},"original":"\tat com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.run(Main.java:246)","position":{},"original":"\tat com.android.dx.command.dexer.Main.run(Main.java:246)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.main(Main.java:215)","position":{},"original":"\tat com.android.dx.command.dexer.Main.main(Main.java:215)"}
    AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.Main.main(Main.java:106)","position":{},"original":"\tat com.android.dx.command.Main.main(Main.java:106)"}


     FAILED

    FAILURE: Build failed with an exception.

    * What went wrong:
    Execution failed for task ':app:dexDebug'.
    > com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_25\bin\java.exe'' finished with non-zero exit value 2

    * Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

是什么导致了“任务执行失败”：app:dexDebug‘“错误，以及如何让Android允许我运行我的应用程序？

Answer 1

在我的例子中，当有两个或更多的库冲突(相同的库，但不同的版本)时，我得到了这个错误。在依赖项块中检查应用程序build.gradle。

查看库，我记得当我有多个模块使用support-v4和support 13时，我遇到了这个问题。我删除了支持-v4，这似乎解决了我的问题。

转到File->Project Structure。检查每个模块的依赖项。