问在Android Java中传递上下文并不好，但是如何访问服务中的活动呢？

EN

public class BackgroundServiceParent extends Service implements
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {

mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Fitness.HISTORY_API)
            .addApi(Fitness.CONFIG_API)
            .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ))
            .useDefaultAccount()
            .addConnectionCallbacks(
                    new GoogleApiClient.ConnectionCallbacks() {
....

if (!result.hasResolution()) {
    // Show the localized error dialog

    GooglePlayServicesUtil.getErrorDialog(result.getErrorCode(),
     (Activity) applicationContext, 0).show();
      return;
}

if (!authInProgress) {
    try {
        authInProgress = true;
        result.startResolutionForResult((Activity) applicationContext, REQUEST_OAUTH);
         } catch (IntentSender.SendIntentException e) {
             Log.e(TAG,
             Exception while starting resolution activity", e);
    }
}
}