Don't show NLSes with excessively long component names

Test: install test app with long CN
Test: ServiceListingTest
Bug: 260570119
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:793257967f165970f8cb0f4cebddab9dcd5d8353)
Merged-In: I3ffd02f6cf6bf282e7fc264fd070ed3add4d8571
Change-Id: I3ffd02f6cf6bf282e7fc264fd070ed3add4d8571

Author: Julia Reynolds

src/com/android/settings/notification/NotificationAccessSettings.java

@@ -65,6 +65,7 @@ public class NotificationAccessSettings extends EmptyTextSettings {
     private static final String TAG = "NotifAccessSettings";
     private static final String ALLOWED_KEY = "allowed";
     private static final String NOT_ALLOWED_KEY = "not_allowed";
+    private static final int MAX_CN_LENGTH = 500;
 
     private static final ManagedServiceSettings.Config CONFIG =
             new ManagedServiceSettings.Config.Builder()
@@ -101,6 +102,12 @@ public void onCreate(Bundle icicle) {
                 .setNoun(CONFIG.noun)
                 .setSetting(CONFIG.setting)
                 .setTag(CONFIG.tag)
+                .setValidator(info -> {
+                    if (info.getComponentName().flattenToString().length() > MAX_CN_LENGTH) {
+                        return false;
+                    }
+                    return true;
+                })
                 .build();
         mServiceListing.addCallback(this::updateList);