使用Google+ API登录Android应用

Question

I'm trying to use Google+ API for login in my Android app. I already enabled the API for my account but now I'm facing problem with initializing the PlusClient.

I'm following this directions https://developers.google.com/+/mobile/android/getting-started#step_3_initialize_the_plusclient and I need to import this into my project:

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;

Sadly Eclipse is showing this error for each input:

The import com.google.android.gms cannot be resolved

My build target is set to Google APIs 17, google-play-service_lib is added as library, there is also android-support-v4.jar and I have no clue what is wrong.

Answer 1

Check that your project is correctly using google-play-services_lib as a library.

In Eclipse, go to Project > Properties > Android and check that google-play-services_lib is listed under the Library section - and that it has a green tick next to it, not a red cross.

If google-play-services_lib has a red cross next to it, select it and click Remove . Then re-add it.

To add google-play-services_lib if it is missing, click Add... and Eclipse will list the available library projects in your workspace. Select google-play-services_lib and click OK.