IssueTracker

Component used: androidx.preference:preference
Version used: 1.1.1
Devices/Android versions reproduced on: Android 11

Many Preferences can be used without setting a key, e.g. SwitchPreferenceCompat or DropDownPreference.

However, if a ListPreference is used without a key, it crashes when clicked: "java.lang.IllegalArgumentException: Key cannot be null"

(A user probably should set isPersistent/setPersistent to false, to mark the key as unused. However, ListPreference crashes with and without the persistent option .)

The issue is that the list fragment uses the key to find the ListPreference

java.lang.IllegalArgumentException: Key cannot be null
        at androidx.preference.PreferenceGroup.a(PreferenceGroup.java:368)
        at b.o.j.a(PreferenceManager.java:455)
        at b.o.g.findPreference(PreferenceFragmentCompat.java:465)
        at b.o.f.onCreate(PreferenceDialogFragmentCompat.java:89)
        at b.o.c.onCreate(ListPreferenceDialogFragmentCompat.java:48)
        at androidx.fragment.app.Fragment.performCreate(Fragment.java:2949)
        at b.k.d.t.e(FragmentStateManager.java:475)
        at b.k.d.t.l(FragmentStateManager.java:278)
        at b.k.d.n.a(FragmentManager.java:2189)
        at b.k.d.n.c(FragmentManager.java:2100)
        at b.k.d.n.d(FragmentManager.java:2002)
        at b.k.d.n$g.run(FragmentManager.java:524)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)