Crashlytics doesn't see NDK kit

Issue

I integrated Crashlytics into Android app with C++ parts (made with Cocos Creator). Crashes in Java (Crashlytics.getInstance().crash()) logged just fine and they are visible in Firebase Crashlytics console. But crashes in C++ are not detected. So I followed instructions to turn on Crashlytics detailed logs and noticed that NDK kit is missing from the list of kits that Crashlytics initialized with:

06-06 19:13:55.241  9174  9174 D CrashlyticsCore: Exception handling initialization successful
06-06 19:13:55.242  9174  9174 D Fabric  : Initializing io.fabric.sdk.android:fabric [Version: 1.4.8.32], with the following kits:
06-06 19:13:55.242  9174  9174 D Fabric  : com.crashlytics.sdk.android:answers [Version: 1.4.7.32]
06-06 19:13:55.242  9174  9174 D Fabric  : com.crashlytics.sdk.android:beta [Version: 1.2.10.27]
06-06 19:13:55.242  9174  9174 D Fabric  : com.crashlytics.sdk.android:crashlytics [Version: 2.10.1.34]
06-06 19:13:55.242  9174  9174 D Fabric  : com.crashlytics.sdk.android.crashlytics-core [Version: 2.7.0.33]
06-06 19:13:55.242  9174  9174 D Fabric  :
06-06 19:13:55.253  9174  9245 D CrashlyticsCore: Opening a new session with ID ...

./build.gradle

buildscript {
    ....
    dependencies {
        ....
        classpath 'io.fabric.tools:gradle:1.29.0'
    }
    ....
}

./app/build.gradle

apply plugin: 'io.fabric'
...
crashlytics {
    enableNdk true
}
...
dependencies {
    ...
    implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
    implementation 'com.crashlytics.sdk.android:crashlytics-ndk:2.1.0'
    ...
}

UPDATE

NDK disappears from kits list when I use

<meta-data android:name="firebase_crashlytics_collection_enabled" android:value="false" />

and later initialize it with

Fabric.with(this, new Crashlytics());

in order to get user's consent first for GDPR compliance.

Should I initialize Crashlytics NDK kit from C++ via JNI in that case?

Solution

If you postpone Crashlytics initialization to acquire users's consent using

<meta-data android:name="firebase_crashlytics_collection_enabled" android:value="false" />

then to activate ndk-kit later you have to explicitly enlist it as an argument to Fabric.with:

Fabric.with(this, new Crashlytics(), new CrashlyticsNdk());

I hope Firebase/Crashlytics will update "opt-in reporting" section of the documentation to mention that.

Answered By - Ilya Denisov