如何添加admob依赖关系？

Question

我想添加一个admob横幅到我的android应用程序，但我不能添加这个依赖关系。你能帮我请

这是代码

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    testCompile 'junit:junit:4.12' 
    compile 'com.android.support:appcompat-v7:23.2.0' 
    compile 'com.android.support:design:23.2.0' 
    compile 'com.google.android.gms:play-services-ads:11.2.0' 
} 

我得到这个错误

Error:(26, 13) Failed to resolve: com.google.android.gms:play-services-ads:11.2.0 
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:D:/WorldOfKids/app/build.gradle">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a> 

Answer 1

退房的项目级的build.gradle文件。它应该有maven指令

allprojects { 
repositories { 
    jcenter() 
    maven { 
     url "https://maven.google.com" 
    } 
} 
}