Android Question material dialogs example does not compile

[poya10]

android.support.v7.widget.RecyclerView

B4A Version: 11.50
Parsing code.    (0.01s)
    Java Version: 11
Building folders structure.    (0.01s)
Compiling code.    (0.01s)
Compiling layouts code.    (0.00s)
Organizing libraries.    (0.00s)
    (AndroidX SDK)
Compiling resources    (0.04s)
Linking resources    (0.57s)
Compiling generated Java code.    Error
src\de\amberhome\materialdialogs\example\main.java:17: error: cannot access RecyclerView
public class main extends de.amberhome.materialdialogs.MaterialDialogsActivity implements B4AActivity{
       ^
  class file for android.support.v7.widget.RecyclerView not found
1 error

javac 11.0.1

Edit 1: I added this to my project :

#Extends: androidx.appcompat.app.AppCompatActivity

it compiles correctly but stop working in my phone with this errors:

Logger connected to:  Sony F3212
--------- beginning of main
Copying updated assets files (3)
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Error occurred on line: 57 (Main)
java.lang.ClassCastException: de.amberhome.materialdialogs.example.main cannot be cast to de.amberhome.materialdialogs.MaterialDialogsActivity
    at de.amberhome.materialdialogs.MaterialDialogsActivity$MDManager.Initialize(MaterialDialogsActivity.java:107)
    at de.amberhome.materialdialogs.example.main._activity_create(main.java:410)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at de.amberhome.materialdialogs.example.main.afterFirstLayout(main.java:105)
    at de.amberhome.materialdialogs.example.main.access$000(main.java:17)
    at de.amberhome.materialdialogs.example.main$WaitForLayout.run(main.java:83)
    at android.os.Handler.handleCallback(Handler.java:836)
    at android.os.Handler.dispatchMessage(Handler.java:103)
    at android.os.Looper.loop(Looper.java:203)
    at android.app.ActivityThread.main(ActivityThread.java:6364)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
** Activity (main) Resume **

 

[Erel]

This is an old and unmaintained library. Don't use it.

 

[poya10]

ok , thanks .?