[Regional Preference] Do not get child fragment if the fragment is not

added

Bug: 279376395
Test: local test
Change-Id: I352597dedf2ba7770936d44d09aa111762f94502

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

@@ -51,20 +51,27 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
     static final String ARG_TARGET_LOCALE = "arg_target_locale";
     static final String ARG_RESULT_RECEIVER = "arg_result_receiver";
 
+    public static LocaleDialogFragment newInstance() {
+        return new LocaleDialogFragment();
+    }
+
     /**
      * Show dialog
      */
-    public static void show(
+    public void show(
             @NonNull RestrictedSettingsFragment fragment,
             int dialogType,
             LocaleStore.LocaleInfo localeInfo) {
+        if (!isAdded()) {
+            return;
+        }
         show(fragment, dialogType, localeInfo, null);
     }
 
     /**
      * Show dialog
      */
-    public static void show(
+    public void show(
             @NonNull RestrictedSettingsFragment fragment,
             int dialogType,
             LocaleStore.LocaleInfo localeInfo,

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

@@ -319,8 +319,9 @@ class LocaleDragAndDropAdapter
 
     public void doTheUpdateWithMovingLocaleItem() {
         LocaleStore.LocaleInfo localeInfo = mFeedItemList.get(0);
+        final LocaleDialogFragment fragment = LocaleDialogFragment.newInstance();
         if (!localeInfo.getLocale().equals(LocalePicker.getLocales().get(0))) {
-            LocaleDialogFragment.show(mParent,
+            fragment.show(mParent,
                     LocaleDialogFragment.DIALOG_CONFIRM_SYSTEM_DEFAULT,
                     localeInfo,
                     new ResultReceiver(new Handler(Looper.getMainLooper())) {
@@ -332,7 +333,7 @@ class LocaleDragAndDropAdapter
                                 if (resultCode == Activity.RESULT_OK) {
                                     doTheUpdate();
                                     if (!localeInfo.isTranslated()) {
-                                        LocaleDialogFragment.show(mParent,
+                                        fragment.show(mParent,
                                                         LocaleDialogFragment
                                                                 .DIALOG_NOT_AVAILABLE_LOCALE,
                                                         localeInfo);