我有一个 Android 项目，它使用 gradle 和另一个项目作为依赖项。依赖项目有一个库 jar。当我尝试编译项目库时，编译了两次，但出现错误: 错误:Class no.nordicsemi.android.log.LogContract.Application 已经添加到输出中。请删除重复的副本。

这是包含相关文件的文件夹结构:

>ProjectRoot
  >dFULibrary
    >libs
      -nrf-logger-v2.0.jar
    -build.gradle
  >Logger
    -build.gradle

这是 dFULibrary 依赖的 build.gradle:

apply plugin: 'com.android.library'

android {
    compileSdkVersion 19
    buildToolsVersion "19.1.0"

    defaultConfig {
        applicationId "no.nordicsemi.android.dfu"
        minSdkVersion 18
        targetSdkVersion 19
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:+'
    compile files('libs/nrf-logger-v2.0.jar')
}

这是 Logger 的 build.gradle(主要项目):

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.14.4'
    }
}

apply plugin: 'com.android.application'

    android {

    compileSdkVersion 20
    buildToolsVersion '20'

    sourceSets {
        main {
            java.srcDirs "src/main/java"
            res.srcDirs "src/main/res"
            assets.srcDirs = ['assets']
        }
        androidTest.setRoot('tests')
        androidTest.java.srcDirs = ['tests/src']

    }
    dexOptions {
        preDexLibraries = false
    }
}

dependencies {
    compile 'com.android.support:support-v4:+'
    compile project':dFULibrary')
}

no.nordicsemi.android.log.LogContract.Application class is found of nrf-logger-v2.0.jar 为什么它被包含两次，我如何确保它没有被包含？

添加

这是 ../gradlew dependencies 返回的内容:

_debugApk - ## Internal use, do not manually configure ##
\--- project :dFULibrary

_debugCompile - ## Internal use, do not manually configure ##
+--- project :dFULibrary
\--- com.android.support:support-v4:+ -> 21.0.2
     \--- com.android.support:support-annotations:21.0.2

_releaseApk - ## Internal use, do not manually configure ##
\--- project :dFULibrary

_releaseCompile - ## Internal use, do not manually configure ##
+--- project :dFULibrary
\--- com.android.support:support-v4:+ -> 21.0.2
     \--- com.android.support:support-annotations:21.0.2

androidJacocoAgent - The Jacoco agent to use to get coverage data.
\--- org.jacoco:org.jacoco.agent:0.7.1.201405082137 FAILED

androidJacocoAnt - The Jacoco ant tasks to use to get execute Gradle tasks.
\--- org.jacoco:org.jacoco.ant:0.7.1.201405082137 FAILED


compile - Classpath for compiling the main sources.
\--- project :dFULibrary


provided - Classpath for only compiling the main sources.
\--- com.android.support:support-v4:+ -> 21.0.2
     \--- com.android.support:support-annotations:21.0.2

我删除了所有没有依赖关系的行。

编辑 #2 来自 ./gradlew androidDependencies 的输出

:DFULibrary:androidDependencies
debug
\--- LOCAL: nrf-logger-v2.0.jar

debugTest
+--- LOCAL: nrf-logger-v2.0.jar
\--- debug
     \--- LOCAL: nrf-logger-v2.0.jar

release
\--- LOCAL: nrf-logger-v2.0.jar
:nRFToolbox:androidDependencies
debug
+--- LOCAL: achartengine-1.1.0.jar
\--- nrfToolbox:DFULibrary:unspecified
     \--- LOCAL: nrf-logger-v2.0.jar

debugTest
No dependencies

release
+--- LOCAL: achartengine-1.1.0.jar
\--- nrfToolbox:DFULibrary:unspecified
     \--- LOCAL: nrf-logger-v2.0.jar

BUILD SUCCESSFUL

最佳答案

宾果游戏，找到了。

只是很有趣，我试图找到 your project在互联网上。并开始我的调查.... :)。

问题隐藏在 nrf-logger-v2.0.jar 中。它包含.java 和.class 文件。 解决方案是从中删除所有 .java 文件。

我做了那个 Total Commander。步骤:

• 将nrf-logger-v2.0.jar重命名为nrf-logger-v2.0.zip;
• 进入并删除所有 .java 文件；
• 将文件重命名回jar；
• gradlew clean build 或 Build-Rebuild project at Android Studio
• 瞧

关于项目依赖中jar的Android "has already been added to output"错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27242331/