android - GoogleApiClient 和 GooglePlayServicesClient : Can you preserve a separation of concerns?

Question

我的情况:

1. 首先，我在应用中实现了 Google Plus 身份验证。我关注了quick start instructions并添加了 quick start sample app code到我的应用程序。
2. 然后我想获取用户最后的已知位置。 Fused Location Provider 似乎是获取它的最现代的方式，所以我查看了 LocationUpdates.zip和 kpbird's demo code .

我的担忧:

• com.google.android.gms.common.api.GoogleApiClient 和 com.google.android.gms.common.GooglePlayServicesClient 命名空间引入了一些重叠事实上，如果您想使用 GoogleApiClient 和 LocationClient，那么您的类(即 Activity)必须实现以下内容:

  GoogleApiClient.ConnectionCallbacks,  
  GoogleApiClient.OnConnectionFailedListener,  
  GooglePlayServicesClient.ConnectionCallbacks,  
  GooglePlayServicesClient.OnConnectionFailedListener
  

来自两个命名空间的代码将覆盖以下内容:

@Override
public void onConnected(Bundle connectionHint) {
            /* pseudo-code
            if (GoogleApiClient) {
               // Implementation
            } else {                
               // Must be LocationClient
            }
            */
}

@Override
public void onConnectionFailed(ConnectionResult result) {
            /* pseudo-code
            if (GoogleApiClient) {
               // Implementation
            } else {                
               // Must be LocationClient
            }
            */
}

这样您将被迫编写代码来辨别是 GoogleApiClient 还是 LocationClient 触发了 onConnected 和 onConnectionFailed 事件处理程序。

---

我的问题:

• 我想保留 separation of concerns 。有更好的方法来解决这个问题吗？

Answer 1

您可以在 Activity 类中创建单独的对象成员，而不是在 Activity 类本身中实现这些接口(interface)。

public YourActivity extends Activity {
    ...
    private GoogleApiClient.ConnectionCallbacks apiClient1 = new GoogleApiClient.ConnectionCallbacks() {
        @Override
        public void onConnectionSuspended(int cause) {
        }

        @Override
        public void onConnected(Bundle connectionHint) {
        }
    };

    private GoogleApiClient.OnConnectionFailedListener apiClient2 = new GoogleApiClient.OnConnectionFailedListener() {
        @Override
        public void onConnectionFailed(ConnectionResult result) {
        }
    };

    private GooglePlayServicesClient.ConnectionCallbacks servicesClient1 = new GooglePlayServicesClient.ConnectionCallbacks() {
        @Override
        public void onDisconnected() {
        }

        @Override
        public void onConnected(Bundle connectionHint) {
        }
    };

    private GooglePlayServicesClient.OnConnectionFailedListener servicesClient2 = new GooglePlayServicesClient.OnConnectionFailedListener() {
        @Override
        public void onConnectionFailed(ConnectionResult result) {
        }
    };
    ...
}

然后，创建您的 GoogleApiClient

GoogleApiClient.Builder builder = new GoogleApiClient.Builder(yourContext, apiClient1, apiClient2);
builder.addApi(...).addScope(...);
GoogleApiClient apiClient = builder.build();

使用以下命令创建您的 LocationClient

LocationClient locClient = new LocationClient(yourContent, servicesClient1, servicesClient2);