What Are the Most Common Mobile SDKs Integrated in Japanese Apps?

Android Support Library V4, developed by Google’s Android team, is a platform that helps app developers manage the release of new API versions. Rather than developing code to handle the provisioning of new features on earlier releases, developers can leverage Android Support Library V4 to provide that compatibility layer.

Firebase is a mobile and web application development platform SDK that gives app builders the ability to develop their apps faster, without worrying about infrastructure. It includes functionalities like analytics, databases, messaging and crash reporting so developers can move quickly and focus on their users.

Firebase Cloud Messaging is a cross-platform messaging solution developed by Google that lets app developers reliably deliver messages at no cost. With Firebase Cloud Messaging, app developers can notify a client app that new email or other data is available to sync, and drive user re-engagement and retention with notification messages.

OkHttp is an open source project designed to be an efficient HTTP client. It's also easy to use. OkHttp’s request/response API is designed with fluent builders and immutability. It supports both synchronous blocking calls and async calls with callbacks.

Gson is a Google-developed Java library that app developers can leverage to convert Java Objects into their JSON representation, and vice versa. It works with arbitrary Java objects, including pre-existing objects of which developers do not have the source-code.

Fabric Crashlytics is the most powerful, lightest weight crash reporting SDK on the market. App developers that leverage Fabric Crashlytics are able to spend less time finding crashes and more time fixing them.