Didn't find class “androidx.core.app.CoreComponentFactory”

Question

I don\'t know what to do about the following errors, I\'ve searched the web but not found anything:

java.lang.ClassNotFoundException: Didn\'t find class \"an         


        

Answer 1

In my case, the code works on one of my teammates' machine. These steps made it work for me too:

1. Close project
2. Remove the project from the list in the welcome screen
3. Open the project again

This is a solution to another problem, that I also found here in SO. It's worth a try when Invalidate and Restart doesn't solve it for you.

Answer 2

After reviewing the Android Issue Tracker bug report mentioned previously, I saw a mention about multidex support. I had no multidex flags specified in my project, so I tried setting the flag to false on all modules in my project, and the exception went away.

This was not a permanent solution; the problem returned a few builds later.

Answer 3

See java.lang.ClassNotFoundException: Didn't find class "com.my_app_name.androidx".

Remove from AndroidManifest:

<application
    ...
    android:appComponentFactory="androidx"
    tools:replace="android:appComponentFactory"
>

These lines appeared a year ago after migrating to AndroidX. I removed them, now it doesn't show the exception.

Answer 4

Seems to be a bug, check the next link in the issue tracker:

https://issuetracker.google.com/issues/137646829