Enable Carrier-Config cache for Settings

- Since the "Mobile-Data Details Settings" (NETWORK_OPERATOR_SETTINGS) will query Carrier-Config around 70 times during launching, use the Carrier-Config cache to reduce 69 times to speed up the launching time.

- It takes about 3ms to query a Carrier-Config each time.

- Create a singleton class to share the Carrier-Config for all
sub-settings.

Bug: 204135235
Test: manual test
atest -c ApnPreferenceControllerTest \
         AutoSelectPreferenceControllerTest \
         BackupCallingPreferenceControllerTest \
         CarrierConfigCacheTest \
         CarrierPreferenceControllerTest \
         CarrierSettingsVersionPreferenceControllerTest \
         DataServiceSetupPreferenceControllerTest \
         Enable2gPreferenceControllerTest \
         EnabledNetworkModePreferenceControllerTest \
         Enhanced4gBasePreferenceControllerTest \
         MobileNetworkUtilsTest \
         NetworkProviderBackupCallingGroupTest \
         NrAdvancedCallingPreferenceControllerTest \
         PreferredNetworkModePreferenceControllerTest \
         TelephonyTogglePreferenceControllerTest \
         WifiPickerTrackerHelperTest
make RunSettingsRoboTests \
     ROBOTEST_FILTER=ContactDiscoveryPreferenceControllerTest
make RunSettingsRoboTests \
     ROBOTEST_FILTER=VideoCallingPreferenceControllerTest

Change-Id: I26f9ac115a754910b5d59e820703f1a0e701bb7f

src/com/android/settings/network/telephony/ContactDiscoveryPreferenceController.java

@@ -35,6 +35,7 @@ import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 import androidx.preference.SwitchPreference;
 
+import com.android.settings.network.CarrierConfigCache;
 import com.android.settings.network.SubscriptionUtil;
 
 /**
@@ -47,7 +48,7 @@ public class ContactDiscoveryPreferenceController extends TelephonyTogglePrefere
             Telephony.SimInfo.COLUMN_IMS_RCS_UCE_ENABLED);
 
     private ImsManager mImsManager;
-    private CarrierConfigManager mCarrierConfigManager;
+    private CarrierConfigCache mCarrierConfigCache;
     private ContentObserver mUceSettingObserver;
     private FragmentManager mFragmentManager;
 
@@ -57,7 +58,7 @@ public class ContactDiscoveryPreferenceController extends TelephonyTogglePrefere
     public ContactDiscoveryPreferenceController(Context context, String key) {
         super(context, key);
         mImsManager = mContext.getSystemService(ImsManager.class);
-        mCarrierConfigManager = mContext.getSystemService(CarrierConfigManager.class);
+        mCarrierConfigCache = CarrierConfigCache.getInstance(context);
     }
 
     public ContactDiscoveryPreferenceController init(FragmentManager fragmentManager, int subId,
@@ -96,7 +97,7 @@ public class ContactDiscoveryPreferenceController extends TelephonyTogglePrefere
 
     @Override
     public int getAvailabilityStatus(int subId) {
-        PersistableBundle bundle = mCarrierConfigManager.getConfigForSubId(subId);
+        PersistableBundle bundle = mCarrierConfigCache.getConfigForSubId(subId);
         boolean shouldShowPresence = bundle != null
                 && (bundle.getBoolean(
                 CarrierConfigManager.KEY_USE_RCS_PRESENCE_BOOL, false /*default*/)