编译'com.android.support.constraint：constraint-layout：1.0.0-alpha7'无法解析

Question

我的build.gradle（moudule app）的代码

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.example.hn.myapplication"
        minSdkVersion 14
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    //compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:appcompat-v7:25.+'
    compile 'com.android.support:recyclerview-v7:25.+'
    compile 'com.android.support:support-v4:25.+'
    compile 'com.android.support:design:25.+'
    //compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7'
    compile 'com.android.support.constraint:constraint-layout:1.0.0'
    testCompile 'junit:junit:4.12'
}

这是我的sdk工具。

我尝试compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7' 和compile 'com.android.support.constraint:constraint-layout:1.0.0' 和compile 'com.android.support.constraint:constraint-layout:1.+' 但没有工作。而错误是 Failed to resolve: com.android.support.constraint:constraint-layout:1 我解决了这个问题？

当我使用compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7时 完成此错误：安装工件和同步项目

Answer 1

转到文件 - ＆gt;设置 - ＆gt; sdk经理 - ＆gt; sdk工具 - ＆gt;然后安装谷歌存储库