找不到符号类“Builder”

我最近下载了Android Studio，我认为它比eclipse.

我创建了一个新项目，其中包含登录活动，但该活动似乎有错误:![在此处输入图像描述][1]

**Error:(78, 31) error: cannot find symbol class Builder
Error:Execution failed for task ':app:compileDebugJava'.
> Compilation failed; see the compiler error output for details.**

import com.google.android.gms.plus.PlusClient;


    // This is the helper object that connects to Google Play Services.
    private PlusClient mPlusClient;


@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Initialize the PlusClient connection.
        // Scopes indicate the information about the user your application will be able to access.
        mPlusClient =
                new PlusClient.Builder(this, this, this).setScopes(Scopes.PLUS_LOGIN,
                        Scopes.PLUS_ME).build();
    }

它是以下的重复项无法构建PlusClient https://stackoverflow.com/questions/15108235/unable-to-build-plusclient and 找不到符号类生成器 https://stackoverflow.com/questions/27389192/can-not-find-symbol-class-builder/

快速参考： 问题是 PlayClient 现在已被弃用，但模板仍然使用旧的方式。

因此，您可以：

1. 更改 gradle 依赖项中的播放服务版本（build.gradle) from com.google.android.gms:play-services:6.5.87 to com.google.android.gms:play-services:6.1.71.

OR

2. 使用此处描述的新方法：http://android-developers.blogspot.in/2014/02/new-client-api-model-in-google-play.html http://android-developers.blogspot.in/2014/02/new-client-api-model-in-google-play.html即，而不是创建实例PlusClient.Builder创建一个实例GoogleApiClient.Builder如图所示：

   // Builds single client object that connects to Drive and Google+
   
    import com.google.android.gms.common.api.GoogleApiClient;
    mClient = new GoogleApiClient.Builder(this)
           .addApi(Drive.API)
           .addScope(Drive.SCOPE_FILE)
           .addApi(Plus.API, plusOptions)
           .addScope(Plus.SCOPE_PLUS_LOGIN)
           .addConnectionCallbacks(this)
           .addOnConnectionFailedListener(this)
           .build();