Unresolved reference: Observable in Android Studio 3.4

Question

Updated to Android Studio 3.4, with Gradle 5.1.1 and Kotlin 1.3.10 as minimum versions. Cannot run project anymore due to reactivex.Observable not being found. Has anyone found a solution?

Was using rxBinding lib, also tried using latest vesions RxJava 2.2.8 and RxAndroid 2.1.1 with no success.

Answer 1

Downgrading the build.gradle(project) from classpath 'com.android.tools.build:gradle:3.4.0' to classpath 'com.android.tools.build:gradle:3.2.1' might be help you

Answer 2

The issue is that you need to use RxJava 2.2.8 and if you check the RxAndroid gradle file they are using the RxJava version 2.2.6 :

https://github.com/ReactiveX/RxAndroid/blob/2.x/rxandroid/build.gradle

If you force RxJava to use version 2.2.8 it will work.

Add to gradle:

implementation 'io.reactivex.rxjava2:rxjava:2.2.8