Android Studio - 意外的顶级异常 :

Question

我使用工具中提供的新项目模板在 Android Studio 中构建了一个新项目。所有代码都由 Studio 生成，我还没有做任何修改。

我正在尝试运行代码，但应用程序失败并出现以下错误，不确定是什么问题，因此感谢您的帮助。

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.DexException: Multiple dex files define Landroid/support/v7/app/ActionBar$Callback;
    at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:594)
    at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:552)
    at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:533)
    at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:170)
    at com.android.dx.merge.DexMerger.merge(DexMerger.java:188)
    at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:439)
    at com.android.dx.command.dexer.Main.runMonoDex(Main.java:287)
    at com.android.dx.command.dexer.Main.run(Main.java:230)
    at com.android.dx.command.dexer.Main.main(Main.java:199)
    at com.android.dx.command.Main.main(Main.java:103)

 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:dexDebug'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
    C:\Users\RichardKavanagh\AppData\Local\Android\android-sdk\build-tools\19.0.1\dx.bat --dex --output D:\Android\Projects\MyHealthRecord\app\build\libs\app-debug.dex D:\Android\Projects\MyHealthRecord\app\build\classes\debug D:\Android\Projects\MyHealthRecord\app\build\dependency-cache\debug D:\Android\Projects\MyHealthRecord\app\build\pre-dexed\debug\android-support-v7-appcompat-5a78dab7e2789bbe64f4bc80d106ca75c04dcf6f.jar D:\Android\Projects\MyHealthRecord\app\build\pre-dexed\debug\classes-f9b947272e9f33ba50355b52d82755584f9c0c58.jar D:\Android\Projects\MyHealthRecord\app\build\pre-dexed\debug\support-v4-19.0.0-31a2c13df80d37d62ca50fec3bde6da0ca706223.jar
Error Code:
    2
Output:

    UNEXPECTED TOP-LEVEL EXCEPTION:
    com.android.dex.DexException: Multiple dex files define Landroid/support/v7/app/ActionBar$Callback;
        at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:594)
        at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:552)
        at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:533)
        at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:170)
        at com.android.dx.merge.DexMerger.merge(DexMerger.java:188)
        at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:439)
        at com.android.dx.command.dexer.Main.runMonoDex(Main.java:287)
        at com.android.dx.command.dexer.Main.run(Main.java:230)
        at com.android.dx.command.dexer.Main.main(Main.java:199)
        at com.android.dx.command.Main.main(Main.java:103)



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

BUILD FAILED

Total time: 12.948 secs

Answer 1

就像其他人在这里所说的那样，支持库 (com.android.support) 不止一次地包含在您的项目中。尝试在根级别的 build.gradle 中添加它，它应该排除支持库通过其他项目依赖项导出。

configurations {
    all*.exclude group: 'com.android.support', module: 'support-v4'
}

如果您在这样的依赖项中包含多个支持库，您可能需要删除其中一个: