How do you provide a GoogleApiClient dependency with Dagger2?

问题

I've started using Dagger2 to manage dependencies and I'm trying to understand how I can use DI to provide a singleton GoogleApiClient. The motivations for this are:

• reduce boilerplate code: multiple Activities & Fragments require a GoogleApiClient
• improve testability: currently these Activities and Fragments are not well tested

I want to provide a Singleton GoogleApiClient at the Application scope.

How do you handle callbacks? Whether you choose an auto-managed or manually-managed connection, there are some callbacks that must be handled:

• GoogleApiClient.ConnectionCallbacks (manual only)
• GoogleApiClient.OnConnectionFailedListener (both)

回答1:

You can use the injection to create the client

 @Provides
    @Singleton
    GoogleApiClient providesGoogleApiClient(Context context) {
            return new GoogleApiClient.Builder(context)
                    .addApi(Places.GEO_DATA_API)
                    .addApi(LocationServices.API)
                    .build();
        }

And then manage the call backs on your activity

@Inject GoogleApiClient mGoogleApiClient;



if (mGoogleApiClient != null) {  mGoogleApiClient.registerConnectionCallbacks(this);            mGoogleApiClient.registerConnectionFailedListener`(this);
}

I hope this might help you.

来源：https://stackoverflow.com/questions/35972868/how-do-you-provide-a-googleapiclient-dependency-with-dagger2