Converting Android Studio Project to AnroidX

AndroidX is a major improvement to the original Android Support Library.
for using  androidX and  its libraries  and packages  in your  project  , you have  do  some changes  in the  Default  project.after creating  sample  application , you have  to navigate to the gradel.properties file  and  add  these  line of  codes
android.enablejetifier=true
android.useandroidx=true

And  next  click  on the  SyncNow  
Now  we  have  to wait  to sync finished..after  syncing  finished ,we have to go to the      
Refactor -> Migrate   to  AndroidX 
A window  will be opened  and ask you  whether  you want  to create  a  backup  of  yor  project .
Select  folder  Of backup 
And ok
Your project  will be converted  to AndroidX  correctly.

Now you can use its  packages  and  libraries in you application


good luck