And it’s very easy to significantly slow down your app bootstrap if your team is not very accurate with your dependency graph. So what issues your application might have during this series of events? Dependency InjectionĮven though there are a lot of DI frameworks for Android and Kotlin in the wild, Dagger 2 is de facto an industry standard. Some of the work is also executed on this step and as soon as you are finished you navigate to the actual UI that user can interact with. In most cases main activity end up being SplashActivity of some sort. After onCreate() Android will start your main activity (since we are talking about cold start when user taps icon in launcher). This is the first place where most of us execute code that we need to run before showing any UI to the user. That’s how you have access to Firebase without passing your application context to it.Īfter that, your Application class gets instantiated and it’s onCreate() method is called. If you are using Google’s Firebase, it’s content provider will be the first thing to initialize. First of all it will launch all your ContentProviders, if there is any, in a prioritized order. In a nutshell Android forks app process with the help of Zygote and then asks it to initialize loading through Binder. First of all to those who is not familiar with how Android starts your application, take a look at the ActivityThread class of Android framework and it’s bindApplication method in particular. What happens there? Actually quite a lot of things. So, the bootstrap process of Android app. Before we start, quick note: all that is below in this article is based on my experience along with Agoda Android application’s challenges and difficulties.
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