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The Firebase SDK collects usage and behavior data for your app. The SDK logs two primary types of information:

  • Events: What is happening in your app, such as user actions, system events, or errors.
  • User properties: Attributes you define to describe segments of your userbase, such as language preference or geographic location.

Analytics automatically logs some events and user properties; you don't need to add any code to enable them.

Prerequisites

Add Analytics to your app

Add the dependency for Mobile app reporting in Google Analytics to your app-level build.gradle file:

compile 'com.google.firebase:firebase-core:10.2.1'

Declare the com.google.firebase.analytics.FirebaseAnalytics object at the top of your activity:

private FirebaseAnalytics mFirebaseAnalytics;
MainActivity.java

Then initialize it in the onCreate() method:

// Obtain the FirebaseAnalytics instance.
mFirebaseAnalytics = FirebaseAnalytics.getInstance(this);
MainActivity.java

Log events

Once you have created a FirebaseAnalytics instance, you can use it to log either predefined or custom events with the logEvent() method. You can explore the predefined events and parameters in the FirebaseAnalytics.Event and FirebaseAnalytics.Param reference documentation.

The following code logs a SELECT_CONTENT Event when a user clicks on a specific element in your app.

Bundle bundle = new Bundle();
bundle.putString(FirebaseAnalytics.Param.ITEM_ID, id);
bundle.putString(FirebaseAnalytics.Param.ITEM_NAME, name);
bundle.putString(FirebaseAnalytics.Param.CONTENT_TYPE, "image");
mFirebaseAnalytics.logEvent(FirebaseAnalytics.Event.SELECT_CONTENT, bundle);
MainActivity.java

Confirm Events

You can enable verbose logging to monitor logging of events by the SDK to help verify that events are being logged properly. This includes both automatically and manually logged events.

You can enable verbose logging with a series of adb commands:

adb shell setprop log.tag.FA VERBOSE
adb shell setprop log.tag.FA-SVC VERBOSE
adb logcat -v time -s FA FA-SVC

This command displays your events in the Android Studio logcat, helping you immediately verify that events are being sent.

Next Steps