Firebase Analytics

2023-03-18 hit count image

let's analyze the app more detail using react-native-firebase.


we introduced how to set react-native-firebase at previous blog post - Firebase Admob. we mentioned at previous blog post that Firebase Analytics automatically is started by configuring react-native-firebase. however, when we saw results created Firebase Analytics automatically, we felt that’s not enough, so we write this blog post.

in here we will introduce how to make Firebase Analytics results more detail by using react-native-firebase.

configure library

this blog post is for how to use react-native-firebase for Firebase Analytics. so we need to set react-native-firebase basically. if you don’t know how to set react-native-firebase, see our preivous blog post - Firebase Admob. in this blog post, we skip to install and configure react-native-firebase.


Firebase Analytics gathers app event logs for about one hour and upload them. so if we want to see analytics result data, we should wait for about one hour. however, we can’t wait for one hour to develop or test. so Firebase Analytics provides DebugView which we can debug analytics events. if we use DebugView, we can see almost real time analytics results.

first, we configure DebugView so that we can immediately see Firebase Analytics results after adding react-native-firebase library features.


configure below to iOS for using Firebase Analytics DebugView feature.

  • click ios/[project].xcworkspace file in RN(react native) project folder to execute xcode
  • select Product > Scheme > Edit Scheme... menu on the top of the screen. xcode edit scheme


  • select Run menu on the left of Edit scheme... dialog and click Arguments tab on right side. edit scheme arguments


  • click + button in Arguments Passed On Launch session on Arguments tab and insert below code(include - )
    edit scheme arguments FIRDebugEnabled



Android is more simple than iOS. execute Android Emulator or Device and execute below code.

adb shell setprop <package_name>

if you want to stop DebugView of Firebase Analytics, execute below code.

adb shell setprop .none.


go to DebugView menu in Firebase Analytics on Firebase Console.

firebase analytics debugview

we didn’t execute any iOS, Android so DebugView is wait status. now, execute iOS or Android.

firebase analytics debugview analytics

after a while, you can see almost real time analytics results.

analyze screens

Firebase Analytics has screen_view Event to analyze what screens users saw.

click Events menu in Analytics on Firebase Console. you can see below screen.

google firebase console Analytics Events menu

select screen_view in Event list.

Firebase Analytics Events screen_view

scroll down a little bit, you can see User engagement > Screen class.

Firebase Analytics Events screen_view screen class to screen name

change Screen class to Screen name in User engagement.

Firebase Analytics Events screen name no data

if you check up to here, you might feel it’s not enough. we can see only basic class in Screen class and there are no data in Screen name, so we can’t analyze which screens users have seen more.

so we decided to use setCurrentScreen in react-native-firebase feature to analyze screens users have seen.

add below code to screens you want to analyze.

render() {'HOME');
    return (

insert App screen name to setCurrentScreen of react-native-firebase feature.

and after testing, we can see App screen name which we inserted to setCurrentScreen.

Firebase Analytics Events screen name with data

you can see real time analytics results in DebugView on Firebase Analytics.

Firebase Analytics Events screen name on debug view

DebugView에서 해당 이벤트(screen_view)를 선택하면 위와 같이 상세 화면을 볼 수 있습니다.

analyze Custom Event

we could analyze which screen users have seen more by using setCurrentScreen but we don’t still know what actions users have done in screens. so let’s see how to use logEvent to add Custom Event in Firebase Analytics.

we added below code to analyze Custom Event in Firebase Analytics.

private _onSpeech = (Tts, text: string) => {'onPressSoundButton', { target: text });

logEvent first parameter only supports 100 english character and underbar(_).(up to 100 characters is the maximum character length supported for event parameters.) but our app is multi-language app and we want to know which actions in which languages. so we use second parameter for adding Custom Parameter to Custom Event. second parameter is Object type so we can make any parameters we want.

if you set Custom Parameter to Custom Event like above, you need to add to Firebase Console too.

Firebase Analytics Events custom event

go to Analytics > Events menu, mousehover to Custom Event you added in Event list.

Firebase Analytics custom parameter menu

if you mousehover, you can see ... button. click it and select Edit parameter reporting.

Firebase Analytics custom parameter edit parameter reporting

insert Custom Parameter of Custom Event to searchbar on the left side and click ADD button to add Custom parameter.

Firebase Analytics add custom parameter

do test after adding. after some data are accumulating(almost one day), select Custom Event you added in Events menu.

Firebase Analytics custom parameter

scroll down a little bit, you can see Custom Parameter analytics data you added.

Firebase Analytics custom parameter result

of course, you can see almost real time analytics results in Firebase Analytics DebugView.

Firebase Analytics Events custom event on debug view

if you select Custom Event in DebugView, you can see details with Custom Parameter.


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