Initialize Libraries in an Android Dagger App

Many libraries like Admob on Android require a one-time initialization snippet code to be run. Now, the initialization code is a one-time run, and does not return any object. This is not a factory method. A convenient place that I found happened to be inside the applicationInjector method in the class which extends DaggerApplication.

As an example, here I initialize Admob inside the applicationInjector like so:

@Override
protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
    AppComponent appComponent = DaggerAppComponent.builder().application(this).build();
    appComponent.inject(this);
    MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713");
    return appComponent;
}
 

Perhaps you can extract a private method to initialize library code like so:

@Override
protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
    AppComponent appComponent = DaggerAppComponent.builder().application(this).build();
    appComponent.inject(this);
    initializeLibraries();
    return appComponent;
}

private void initializeLibraries() {
    MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713");
}
 

and you can conveniently place the initialize snippets inside the initializeLibraries method. Now, there might be a better place to place these snippets, maybe inside a lifecycle method, but this seems to work.