Element com.austingreco.imagelistpreference.ImageListPreference is not allowed here

[WouterVandenputte]

First of all, love it that you made this and made it public for everyone

Now for the issue: when adding the following code in root_preferences.xml

    <com.austingreco.imagelistpreference.ImageListPreference
        app:key="@string/prefkey_something"
        android:title="@string/some_text"
        android:entries="@array/some_array"
        android:entryValues="@array/some_array"
        app:ilp_entryImages="@array/some_array_images"
        />

Android Studio raises a 'hint': Element com.austingreco.imagelistpreference.ImageListPreference is not allowed here but does not say why. Compilation works, but when navigating to the settings screen where this layout is inflated, the app crashes with the following stack trace

android.view.InflateException: Binary XML file line #33: Error inflating class com.austingreco.imagelistpreference.ImageListPreference
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:249)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277)
at androidx.preference.PreferenceInflater.rInflate(PreferenceInflater.java:344)
at androidx.preference.PreferenceInflater.rInflate(PreferenceInflater.java:346)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:157)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.mycompany.myapp.SettingsActivity$SettingsFragment.onCreatePreferences(SettingsActivity.kt:40)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2629)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)
at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:247)
at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:541)
at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:210)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1435)
at android.app.Activity.performStart(Activity.java:8024)
at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3475)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.ClassCastException: com.austingreco.imagelistpreference.ImageListPreference cannot be cast to androidx.preference.Preference
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:242)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277) 
at androidx.preference.PreferenceInflater.rInflate(PreferenceInflater.java:344) 
at androidx.preference.PreferenceInflater.rInflate(PreferenceInflater.java:346) 
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:157) 
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109) 
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216) 
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377) 
at com.mycompany.myapp.SettingsActivity$SettingsFragment.onCreatePreferences(SettingsActivity.kt:40) 
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160) 
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684) 
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280) 
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175) 
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255) 
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138) 
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136) 
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989) 
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947) 
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849) 
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2629) 
at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577) 
at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:247) 
at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:541) 
at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:210) 
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1435) 
at android.app.Activity.performStart(Activity.java:8024) 
at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3475) 
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) 
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) 
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:223) 
at android.app.ActivityThread.main(ActivityThread.java:7656) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 
I/Process: Sending signal. PID: 25500 SIG: 9

Additionally, this is line 40 of SettingsActivity

class SettingsFragment : PreferenceFragmentCompat() {

   override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        setPreferencesFromResource(R.xml.root_preferences, rootKey) // line 40
    }
  ..
}

[WouterVandenputte]

The issue is most likely because the library does not use the new androidx widgets etc