adding implementation 'com.google.firebase:firebase-analytics:17.2.2' make implementation 'com.android.support:appcompat-v7:28.0.0' underlined in red

Question

After creating an application and a project on Firebase and downloading google-service.json and placing it in the app repository everything is fine until I try to add any firebase service SDK and after syncing I get the following line:

implementation 'com.android.support:appcompat-v7:28.0.0' underlined with red and the following error

ERROR: Manifest merger failed: Attribute application @ appComponentFactory value = (android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] 
AndroidManifest.xml: 22: 18-91
is also present at [androidx.core: core: 1.0.0] AndroidManifest.xml: 22: 18-86 value = (androidx.core.app.CoreComponentFactory).
Suggestion: add 'tools: replace = "android: appComponentFactory"' to <application> element at AndroidManifest.xml: 5: 5-19: 19 to override.

Answer 1

You have to migrate your project to androidX, Follow these steps:

Refactor -> Refactor this -> Migrate To AndroidX -> ( a message will pop up to ask if you want to back up your project, it is up to you to do that or not ) -> Do Refactor -> the project will sync and you re good to go.