Error:Execution failed for task ':app:preDebugAndroidTestBuild'._espresso execution failed for task ':app:connected-优快云博客

本文链接：https://blog.youkuaiyun.com/hpp_1225/article/details/80476460

本文介绍了解决Android项目中出现的依赖版本冲突问题的方法，通过强制指定版本号来避免不同模块间依赖版本不一致导致的问题。

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用AS新建项目的时候报这个错:

> 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.

错误原因：名为app的module里，com.android.support:support-annotations这个依赖冲突了，app里的版本是26.1.0，但是Test app的版本里是27.1.1。

我的gradle内容：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.landicorp.softinputshadequestion"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    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'
}

跟test相关的就这两个依赖：

 androidTestImplementation 'com.android.support.test:runner:1.0.2'
 androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

在网上搜了一下，用这个方法解决了：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.landicorp.lifehelper"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    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'
}

configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:27.1.1'
}

在grade里面添加：

configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:27.1.1'
}

参考了这个：

https://blog.youkuaiyun.com/wangzici/article/details/80140357