java - 找不到符号类 "Builder"

Question

我最近下载了 Android Studio，我认为它比 eclipse 有更多的功能。

我创建了一个新项目，有一个登录 Activity ，但 Activity 似乎有错误:![在此处输入图片描述][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();
    }

Answer 1

它是 Unable to build PlusClient 的副本和 can not find symbol class Builder

快速引用: 问题是 PlayClient 现在已被弃用，但模板仍然使用旧方法。

因此，您可以:

1. 将 gradle 依赖项 (build.gradle) 中的播放服务版本从 com.google.android.gms:play-services:6.5.87 更改为 com.google.android.gms:play-services:6.1.71。

或

1. 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即，不是创建 PlusClient.Builder 的实例，而是创建 GoogleApiClient.Builder 的实例，如下所示:

   // 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();