[Wi-Fi][A11Y] Fix TalkBack lose focus in WifiSettings & WifiSettings2

Use stable ID feature of RecycleView to keep preference focus.

Bug: 126132618
Test: WifiSettingsTest
      WifiSettings2Test
      manual visual

Change-Id: Id73157b0935186c9a59d1ef68190d853f671ebc2

src/com/android/settings/wifi/WifiSettings.java

@@ -53,6 +53,8 @@ import android.widget.Toast;
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceScreen;
+import androidx.recyclerview.widget.RecyclerView;
 
 import com.android.settings.LinkifyUtils;
 import com.android.settings.R;
@@ -443,6 +445,13 @@ public class WifiSettings extends RestrictedSettingsFragment
         }
     }
 
+    @Override
+    protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
+        final RecyclerView.Adapter adapter = super.onCreateAdapter(preferenceScreen);
+        adapter.setHasStableIds(true);
+        return adapter;
+    }
+
     @Override
     public int getMetricsCategory() {
         return SettingsEnums.WIFI;