[Settings] Show intro preference in numbering system as well

Bug: 377664066
Test: manual
Flag: EXEMPT refactor
Change-Id: I63cbaaa1e9fa3f3530cb05b1a62020bf8f54d1ac

res/values/strings.xml

@@ -531,6 +531,7 @@
     <string name="title_change_system_locale_region">Change region to %s ?</string>
     <!-- Message for asking to change system locale region or not. [CHAR LIMIT=50]-->
     <string name="body_change_system_locale_region">Your device will keep %s as a system language</string>
+    <string name="top_intro_numbering_system_title">The digits used will be dependent on the numbering system</string>
 
     <!-- Regional Preferences begin -->
     <!-- The title of the menu entry of regional preferences. [CHAR LIMIT=50] -->

res/xml/system_language_picker.xml

@@ -22,8 +22,7 @@
 
     <com.android.settingslib.widget.TopIntroPreference
         android:key="top_intro_region"
-        android:title="@string/top_intro_region_title"
+        android:title="@string/top_intro_region_title"/>
-        settings:isPreferenceVisible="false"/>
 
     <PreferenceCategory
         android:key="system_language_suggested_category"

src/com/android/settings/localepicker/LocalePickerBaseListPreferenceController.java

@@ -19,6 +19,7 @@ package com.android.settings.localepicker;
 import static com.android.settings.localepicker.LocaleListEditor.EXTRA_RESULT_LOCALE;
 import static com.android.settings.localepicker.RegionAndNumberingSystemPickerFragment.EXTRA_IS_NUMBERING_SYSTEM;
 
+import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
 import android.os.LocaleList;
@@ -178,7 +179,9 @@ public abstract class LocalePickerBaseListPreferenceController extends
             pref.setTitle(localeName);
             pref.setKey(locale.toString());
             pref.setOnPreferenceClickListener(clickedPref -> {
+                // TODO: b/390347399 - Should pop up a dialog when changes the region.
                 switchFragment(locale);
+                ((Activity) mContext).finish();
                 return true;
             });
             mPreferences.put(locale.getId(), pref);

src/com/android/settings/localepicker/RegionAndNumberingSystemPickerFragment.java

@@ -116,8 +116,8 @@ public class RegionAndNumberingSystemPickerFragment extends DashboardFragment im
         }
 
         TopIntroPreference topIntroPreference = findPreference(KEY_TOP_INTRO_PREFERENCE);
-        if (topIntroPreference != null) {
+        if (topIntroPreference != null && mIsNumberingMode) {
-            topIntroPreference.setVisible(!mIsNumberingMode);
+            topIntroPreference.setTitle(R.string.top_intro_numbering_system_title);
         }
 
         if (mSystemLocaleAllListPreferenceController != null) {

src/com/android/settings/localepicker/SystemLocalePickerFragment.java

@@ -47,6 +47,7 @@ import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.widget.TopIntroPreference;
 
 import com.google.android.material.appbar.AppBarLayout;
 
@@ -71,14 +72,13 @@ public class SystemLocalePickerFragment extends DashboardFragment implements
     private static final String KEY_PREFERENCE_SYSTEM_LOCALE_LIST = "system_locale_list";
     private static final String KEY_PREFERENCE_SYSTEM_LOCALE_SUGGESTED_LIST =
             "system_locale_suggested_list";
+    private static final String KEY_TOP_INTRO_PREFERENCE = "top_intro_region";
 
     @Nullable
     private SearchView mSearchView = null;
     @Nullable
     private SearchFilter mSearchFilter = null;
     @Nullable
-    private Set<LocaleStore.LocaleInfo> mLocaleList;
-    @Nullable
     private List<LocaleStore.LocaleInfo> mLocaleOptions;
     @Nullable
     private List<LocaleStore.LocaleInfo> mOriginalLocaleInfos;
@@ -106,8 +106,15 @@ public class SystemLocalePickerFragment extends DashboardFragment implements
         }
 
         SystemLocaleCollector systemLocaleCollector = new SystemLocaleCollector(getContext(), null);
-        mLocaleList = systemLocaleCollector.getSupportedLocaleList(null, false, false);
+        Set<LocaleStore.LocaleInfo> localeList = systemLocaleCollector.getSupportedLocaleList(null,
-        mLocaleOptions = new ArrayList<>(mLocaleList.size());
+                false, false);
+        mLocaleOptions = new ArrayList<>(localeList.size());
+
+        TopIntroPreference topIntroPreference = findPreference(KEY_TOP_INTRO_PREFERENCE);
+        if (topIntroPreference != null) {
+            topIntroPreference.setVisible(false);
+        }
+
     }
 
     @Override
@@ -175,7 +182,7 @@ public class SystemLocalePickerFragment extends DashboardFragment implements
             FilterResults results = new FilterResults();
 
             if (mOriginalLocaleInfos == null) {
-                mOriginalLocaleInfos = new ArrayList<>(mLocaleList);
+                mOriginalLocaleInfos = new ArrayList<>(mLocaleOptions);
             }
 
             if (TextUtils.isEmpty(prefix)) {