I saw all other questions, but none of accepted answers is working for me.
By following integration steps found here https://dev.twitter.com/twitter-kit/android/integrate I have created crashlytics.properties file in module root. File is filled with apiKey and apiSecret values found in my newly created twitter application.
Error occurr on project build. I am using AndroidStudio 1.0
This is my error:
ERROR - Crashlytics Developer Tools error.
java.lang.IllegalArgumentException: Crashlytics found an invalid API key: REAL_APIKEY_VALUE.
Check the Crashlytics plugin to make sure that the application has been added successfully!
Contact support@fabric.io for assistance.
Works fine added this on fabric.properties like this:
# Fabric properties file: app/fabric.properties
apiSecret=xx68f6074dxxxxxc11dxxx97c172e8ebf0
apiKey=xxxe76c4xxxx97e8cxxxx0135e9d46f5a2xxx
Add on .gitignore (for open source projects)
REMOVE entry on AndroidManifest.xml:
<meta-data
android:name="io.fabric.ApiKey"
android:value="xxx6c41xxx6ec601xxxd4xxxa2" />
Oficial documentation: https://docs.fabric.io/android/fabric/settings/working-in-teams.html
This happened to me when I updated Android Studio from 3.2 to 3.3, to fix it I just updated the
classpath 'com.google.gms:google-services:4.1.0'
to
classpath 'com.google.gms:google-services:4.2.0'
And it worked again
You just forgot to add one line, in app-level gradle file.
apply plugin: 'com.google.gms.google-services'
this happens because when you are adding firebase:crashlytics, firebase document not have this line. so you need to add it manually. see this is firebase:crashlytics document photo.
after adding file fabric.properties, getting error as below.
Crashlytics found an invalid API key: null. Check the Crashlytics plugin to make sure that the application has been added successfully! Contact support@fabric.io for assistance.
We need to register app and verify SHA-1 for same. Add firebase: add google-services.json file from firebase console to your /app folder of your application.(follow steps given by Firebase Console-> Add Firebase to your Android app ) It's not giving error now
Add the below line in app/build.gradle file
apply plugin: 'com.google.gms.google-services'
Clean The Project and Run.
I also experienced this issue and it took a while for me to realize I forgot adding the following line into the app/build.gradle:
apply plugin: 'com.google.gms.google-services'
After adding it, it started working like a charm without <meta-data> in manifest and/or app/fabric.properties file.
来源：https://stackoverflow.com/questions/27472452/crashlytics-found-an-invalid-api-key-androidstudio-build