使用AS新建工程preDebugAndroidTestBuild报错

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使用Android Studio 3.0新建工程，一路默认走下来竟然报错了，报错内容：

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Error:Execution failed for task ':app:preDebugAndroidTestBuild'.
> Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

GG 文内图片找不回来了，七牛真坑，图片原外链不让访问，还不让下载

原因排查

吐槽：讲道理，怎么编译器新建一个默认工程还能报错啊，好吧，解决它

看报错信息，是com.android.support:support-annotations这个包引入了两个版本，看编译后的环境，确实如此

20180729153284735777363.png

默认的build.gradle dependencies标签下是这样的

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dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

排查后发现，'com.android.support:appcompat-v7:26.1.0'这里包含的是26.1.0版本的annotations包，而'com.android.support.test:runner:1.0.2'和'com.android.support.test.espresso:espresso-core:3.0.2'这两个用于测试的库包含27.1.1版本

解决问题

方式1

如果需要用runner和espresso这两个用于测试的库，可以直接把这两行去掉，gralde文件变成：

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dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
}

方式2

声明runner和espress两个测试库不重复引入annotations包

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dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])Ω
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2', {
        exclude module: 'junit'
        exclude group: 'com.android.support', module: 'support-annotations'
    }
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    }
}

方式3

强制声明最终引入的annotations包的版本

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dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])Ω
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    androidTestImplementation('com.android.support:support-annotations:26.1.0') {
        force = true
    }

}

大吉大利

好了终于正常了，大吉大利

20180729153284783623098.png