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Failed to resolve: com.google.firebase:firebase-core:9.0.0

If you are upgraded to Android Studio 2.2.2 and using lower version liberary of firebase then you might face the error Failed to resolve: com.google.firebase:firebase-messaging:9.0.0 , Error:(39, 13) Failed to resolve: com.google.firebase:firebase-analytics:9.0.0
Error:(38, 13) Failed to resolve: com.google.firebase:firebase-core:9.0.0


The solution of this is the error is to change the library version to latest version of firebase(9.6.0) in your build.gradle file. Make sure to all other dependency and android plugin are also up to date.
   compile 'com.google.firebase:firebase-ads:9.6.0'  
compile 'com.google.firebase:firebase-core:9.6.0'
compile 'com.google.firebase:firebase-analytics:9.6.0'
compile 'com.google.firebase:firebase-messaging:9.6.0'

After adding the dependency to the latest version click on sync project.

There may be the issue with google repository so install the latest repository as given in below screen shots.

Firebase Error

If it is resolved then good otherwise we can check the further troubleshooting steps as given below.

Maybe you were not able to edit the file from Android Studio because of slow response then you can kill the Android Studio and open the build.gradle file in any text editor and then modify the file and start the Android Studio again. It takes some time any sync your project and you will be ready. But still your problem is not resolved and you are getting error similar as given below then you may need to modify your other dependency to latest version 25

Then change the compile and target version to 25 and click on install and sync project. It will start downloading the latest version SDK and sync the project again.

To install:
- Android SDK Platform 25 (platforms;android-25)

Preparing "Install Android SDK Platform 25".
Downloading https://dl.google.com/android/repository/platform-25_r01.zip.

Preparing "Install Android SDK Platform 25".
Downloading https://dl.google.com/android/repository/platform-25_r01.zip
"Install Android SDK Platform 25" ready.
Finishing "Install Android SDK Platform 25"
Installing Android SDK Platform 25 in C:UsersPKAppDataLocalAndroidSdkplatformsandroid-25
"Install Android SDK Platform 25" complete.
Once done all steps above click on Finish button.

Again maybe they are not able to get the build tool for SDK 25 and again you get the error click on install and it will start downloading the latest build tool.

To install:
- Android SDK Build-Tools 25 (build-tools;25.0.0)

Preparing "Install Android SDK Build-Tools 25".
Downloading https://dl.google.com/android/repository/build-tools_r25-windows.zip

You may get this error due to some network problem, you check it by clicking on check update from help menu whether its working or not. If you are getting any network error while clicking on check update then it is must be due to the network problem.

If all above given way does not work then one more stuff of this is removing all firebase dependency from your build.gadle file then sync the project, definitely, you will get lots of error after that. But once sync the project with firebase then add them again and try to sync the project.

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