If you are interested in using Firebase with libGDX, take a look at mk-5’s gdx-fireapp.
Setup
Add the following dependencies to the corresponding places in your build.gradle files. For further information check out the project’s extensive wiki: Android guide, iOS guide, GWT guide.
Core:
implementation "pl.mk5.gdx-fireapp:gdx-fireapp-core:$gdxFireappVersion"
Android:
implementation "pl.mk5.gdx-fireapp:gdx-fireapp-android:$gdxFireappVersion"
iOS:
implementation "pl.mk5.gdx-fireapp:gdx-fireapp-ios:$gdxFireappVersion"
GWT:
implementation "pl.mk5.gdx-fireapp:gdx-fireapp-html:$gdxFireappVersion"
Basics
Gdx-firebase is a bridge between a libGDX app and the Firebase SDK. It covers Firebase functionality, so if you have some knowledge of the Firebase SDK, using gdx-firebase’s API should be intuitive.
To initialize the library, just put this line somewhere in your app’s initialization code:
GdxFIRApp.inst().configure();
Firebase Analytics should start working just after this step.
Examples
The project’s wiki provides various examples. Check them out here.