How to check if a Firebase App is already initialized on Android

Question

With the following, the first time it's called it works, but then fails on subsequent calls with "FirebaseApp name [DEFAULT] already exists!"

public FirebaseDatabase conn(Context c) {          FirebaseOptions options = new FirebaseOptions.Builder()                 .setApiKey("key")                 .setDatabaseUrl("url")                 .setApplicationId("ID")                 .build();           /////I tried Try and Catch with no success//////         FirebaseApp app = FirebaseApp.initializeApp(c, options);          /// for this : FirebaseApp app = FirebaseApp.initializeApp(c, options, "some_app");         //// will fail with "FirebaseApp name some_app already exists!"         return FirebaseDatabase.getInstance(app); } 

All of the above is an attempt to connect to a second Firebase App.

Answer 1

On firebase web, you check if already initialized with:

if (firebase.apps.length === 0) {     firebase.initializeApp({}); } 

Answer 2

In v9, Firebase has been modularized for better tree shaking. So we can no longer import entire app and check the apps property AFAIK. The below approach can be used instead.

import { initializeApp, getApps, getApp } from "firebase/app"; getApps().length === 0 ? initializeApp(firebaseConfig) : getApp(); 

https://firebase.google.com/docs/reference/js/v9/app.md#getapps for documentation