Fix issue that the wifi calling text cannot be customized based on sim

Some carriers have requirements that the wifi calling text should be
customizable. However, the resources for the wifi calling text are
not obtained based on sim. So it cannot be customized per sim for multi
sim device. To solve this issue, obtain the resources with specified
sim.

Test: manual - Checked that the wifi calling text could be customized
based on sim.
Bug: 117257109

Change-Id: I6b3f6b06c9cc984ee6a68a19ae317b5d1d4e48e2

src/com/android/settings/wifi/calling/WifiCallingSettings.java

@@ -30,6 +30,7 @@ import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
 
 import com.android.ims.ImsManager;
+import com.android.internal.util.CollectionUtils;
 import com.android.settings.R;
 import com.android.settings.core.InstrumentedFragment;
 import com.android.settings.search.actionbar.SearchMenuController;
@@ -53,6 +54,24 @@ public class WifiCallingSettings extends InstrumentedFragment implements HelpRes
     private WifiCallingViewPagerAdapter mPagerAdapter;
     private SlidingTabLayout mTabLayout;
 
+    private final class InternalViewPagerListener implements
+            RtlCompatibleViewPager.OnPageChangeListener {
+        @Override
+        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+            // Do nothing.
+        }
+
+        @Override
+        public void onPageSelected(int position) {
+            updateTitleForCurrentSub();
+        }
+
+        @Override
+        public void onPageScrollStateChanged(int state) {
+            // Do nothing.
+        }
+    }
+
     @Override
     public int getMetricsCategory() {
         return SettingsEnums.WIFI_CALLING;
@@ -68,6 +87,7 @@ public class WifiCallingSettings extends InstrumentedFragment implements HelpRes
 
         mPagerAdapter = new WifiCallingViewPagerAdapter(getChildFragmentManager(), mViewPager);
         mViewPager.setAdapter(mPagerAdapter);
+        mViewPager.addOnPageChangeListener(new InternalViewPagerListener());
 
         return view;
     }
@@ -93,6 +113,8 @@ public class WifiCallingSettings extends InstrumentedFragment implements HelpRes
         } else {
             mTabLayout.setVisibility(View.GONE);
         }
+
+        updateTitleForCurrentSub();
     }
 
     @Override
@@ -163,4 +185,13 @@ public class WifiCallingSettings extends InstrumentedFragment implements HelpRes
             }
         }
     }
+
+    private void updateTitleForCurrentSub() {
+        if (CollectionUtils.size(mSil) > 1) {
+            final int subId = mSil.get(mViewPager.getCurrentItem()).getSubscriptionId();
+            final String title = SubscriptionManager.getResourcesForSubId(getContext(), subId)
+                    .getString(R.string.wifi_calling_settings_title);
+            getActivity().getActionBar().setTitle(title);
+        }
+    }
 }