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/wifi/WifiPickerTrackerHelper.java

@@ -35,6 +35,7 @@ import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.OnLifecycleEvent;
 
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.network.CarrierConfigCache;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.wifitrackerlib.MergedCarrierEntry;
 import com.android.wifitrackerlib.WifiEntry;
@@ -64,7 +65,7 @@ public class WifiPickerTrackerHelper implements LifecycleObserver {
     protected HandlerThread mWorkerThread;
 
     protected final WifiManager mWifiManager;
-    protected final CarrierConfigManager mCarrierConfigManager;
+    protected final CarrierConfigCache mCarrierConfigCache;
 
     public WifiPickerTrackerHelper(@NonNull Lifecycle lifecycle, @NonNull Context context,
             @Nullable WifiPickerTracker.WifiPickerTrackerCallback listener) {
@@ -88,7 +89,7 @@ public class WifiPickerTrackerHelper implements LifecycleObserver {
                 listener);
 
         mWifiManager = context.getSystemService(WifiManager.class);
-        mCarrierConfigManager = context.getSystemService(CarrierConfigManager.class);
+        mCarrierConfigCache = CarrierConfigCache.getInstance(context);
     }
 
     /** @OnLifecycleEvent(ON_DESTROY) */
@@ -104,7 +105,7 @@ public class WifiPickerTrackerHelper implements LifecycleObserver {
 
     /** Return the enabled/disabled state of the carrier network provision */
     public boolean isCarrierNetworkProvisionEnabled(int subId) {
-        final PersistableBundle config = mCarrierConfigManager.getConfigForSubId(subId);
+        final PersistableBundle config = mCarrierConfigCache.getConfigForSubId(subId);
         if (config == null) {
             Log.e(TAG, "Could not get carrier config, subId:" + subId);
             return false;