In order to add firebase-database to your application, you also need to add the firebase-core libraries (which you commented out).
app/build.gradle
dependencies {
// ...
implementation 'com.google.firebase:firebase-core:16.0.6'
}
If you haven’t done so, you also need to add rules to include Google services and Google’s Maven repository.
Please read Add Firebase to Your Android Project to find out more.
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solved Firebase Error : Failed to resolve : com.google.firebase:firebase-database:16.0.6 [closed]