Firebase Remote Config

FirebaseRemoteConfig.java

final FirebaseRemoteConfig mRemoteConfig = FirebaseRemoteConfig.getInstance();

// cache expiration in seconds
long cacheExpiration = 3600; //1 hour

//Settings
FirebaseRemoteConfigSettings remoteConfigSettings = new FirebaseRemoteConfigSettings.Builder()
        .setDeveloperModeEnabled(true)
        .build();
mRemoteConfig.setConfigSettings(remoteConfigSettings);

//expire the cache immediately for development mode.
if (mRemoteConfig.getInfo().getConfigSettings().isDeveloperModeEnabled()) {
    cacheExpiration = 0;
}

//Fetch parameter values from the Remote Config Server
mRemoteConfig.fetch(cacheExpiration)
    .addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        if (task.isSuccessful()) {          
            //Make the values available to your app
            mRemoteConfig.activateFetched();
            //get value from remote config
            String testString = mRemoteConfig.getString("test"); 
        }
    }
});