Android Gradle 失败 多个 dex 文件定义 okhttp

Question

我有以下依赖项:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-moshi:2.3.0'
    compile('com.github.eoinsha:JavaPhoenixChannels:0.2') {
        exclude module: 'groovy-all'
    }
}

和下面的依赖树:

+--- com.android.support:appcompat-v7:25.3.1
|    +--- com.android.support:support-annotations:25.3.1
|    +--- com.android.support:support-v4:25.3.1
|    |    +--- com.android.support:support-compat:25.3.1
|    |    |    \--- com.android.support:support-annotations:25.3.1
|    |    +--- com.android.support:support-media-compat:25.3.1
|    |    |    +--- com.android.support:support-annotations:25.3.1
|    |    |    \--- com.android.support:support-compat:25.3.1 (*)
|    |    +--- com.android.support:support-core-utils:25.3.1
|    |    |    +--- com.android.support:support-annotations:25.3.1
|    |    |    \--- com.android.support:support-compat:25.3.1 (*)
|    |    +--- com.android.support:support-core-ui:25.3.1
|    |    |    +--- com.android.support:support-annotations:25.3.1
|    |    |    \--- com.android.support:support-compat:25.3.1 (*)
|    |    \--- com.android.support:support-fragment:25.3.1
|    |         +--- com.android.support:support-compat:25.3.1 (*)
|    |         +--- com.android.support:support-media-compat:25.3.1 (*)
|    |         +--- com.android.support:support-core-ui:25.3.1 (*)
|    |         \--- com.android.support:support-core-utils:25.3.1 (*)
|    +--- com.android.support:support-vector-drawable:25.3.1
|    |    +--- com.android.support:support-annotations:25.3.1
|    |    \--- com.android.support:support-compat:25.3.1 (*)
|    \--- com.android.support:animated-vector-drawable:25.3.1
|         \--- com.android.support:support-vector-drawable:25.3.1 (*)
+--- com.squareup.retrofit2:retrofit:2.3.0
|    \--- com.squareup.okhttp3:okhttp:3.8.0
|         \--- com.squareup.okio:okio:1.13.0
+--- com.squareup.retrofit2:converter-moshi:2.3.0
|    +--- com.squareup.retrofit2:retrofit:2.3.0 (*)
|    \--- com.squareup.moshi:moshi:1.4.0
|         \--- com.squareup.okio:okio:1.11.0 -> 1.13.0
\--- com.github.eoinsha:JavaPhoenixChannels:0.2
     +--- com.fasterxml.jackson.core:jackson-databind:2.8.3
     |    +--- com.fasterxml.jackson.core:jackson-annotations:2.8.0
     |    \--- com.fasterxml.jackson.core:jackson-core:2.8.3
     \--- com.squareup.okhttp3:okhttp-ws:3.4.1
          \--- com.squareup.okhttp3:okhttp:3.4.1 -> 3.8.0 (*)

我在尝试构建项目时遇到此错误:

Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define Lokhttp3/internal/ws/WebSocketReader$FrameCallback;

这可能是由于类路径上存在两个不同版本的 okhttp 库造成的:

• 3.4.1 by com.squareup.okhttp3:okhttp-ws 这是 JavaPhoenixChannels

的依赖项

• 3.8.0 改造

Gradle 应该能够自动解决这个问题，所以我想知道问题是什么。 我试图通过从它们各自的一级依赖项中排除 okhttp 和 okhttp-ws 并分别编译它们来修复它，但这似乎没有帮助。

也欢迎解释为什么会弹出此类错误。

Answer 1

正如@Selvin 在评论中指出的那样，问题是由于 okhtt-ws 自 3.5 版以来已移入核心项目，因此指定了较新版本的okhttp 和旧版本的 okhttp-ws 将导致 okhttp-ws 库的两个不同副本最终出现在类路径中。对于 gradle，这些将是使用相同包层次结构的不同库，因此它不会自动排除一个。

TL;DR 通过排除 okhttp-ws 依赖项来修复错误，因为它已经在 okhttp 本身的 3.8 版中可用:

compile 'com.squareup.okhttp3:okhttp:3.8.0'
compile('com.github.eoinsha:JavaPhoenixChannels:0.2') {
    exclude module: 'okhttp-ws'
}