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

tests/unit/src/com/android/settings/wifi/WifiPickerTrackerHelperTest.java

@@ -37,6 +37,7 @@ import androidx.lifecycle.Lifecycle;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 
+import com.android.settings.network.CarrierConfigCache;
 import com.android.settings.testutils.FakeFeatureFactory;
 import com.android.wifitrackerlib.MergedCarrierEntry;
 import com.android.wifitrackerlib.WifiEntry;
@@ -60,7 +61,7 @@ public class WifiPickerTrackerHelperTest {
     @Mock
     public WifiManager mWifiManager;
     @Mock
-    public CarrierConfigManager mCarrierConfigManager;
+    public CarrierConfigCache mCarrierConfigCache;
     @Mock
     public WifiPickerTracker mWifiPickerTracker;
     @Mock
@@ -77,10 +78,9 @@ public class WifiPickerTrackerHelperTest {
     public void setUp() {
         final Context context = spy(ApplicationProvider.getApplicationContext());
         when(context.getSystemService(WifiManager.class)).thenReturn(mWifiManager);
-        when(context.getSystemService(CarrierConfigManager.class))
-                .thenReturn(mCarrierConfigManager);
         mCarrierConfig = new PersistableBundle();
-        doReturn(mCarrierConfig).when(mCarrierConfigManager).getConfigForSubId(SUB_ID);
+        when(mCarrierConfigCache.getConfigForSubId(SUB_ID)).thenReturn(mCarrierConfig);
+        CarrierConfigCache.setTestInstance(context, mCarrierConfigCache);
 
         mFeatureFactory = FakeFeatureFactory.setupForTest();
         when(mFeatureFactory.wifiTrackerLibProvider
@@ -108,7 +108,7 @@ public class WifiPickerTrackerHelperTest {
 
     @Test
     public void isCarrierNetworkProvisionEnabled_getNullConfig_returnFalse() {
-        doReturn(null).when(mCarrierConfigManager).getConfigForSubId(SUB_ID);
+        when(mCarrierConfigCache.getConfigForSubId(SUB_ID)).thenReturn(null);
 
         assertThat(mWifiPickerTrackerHelper.isCarrierNetworkProvisionEnabled(SUB_ID)).isFalse();
     }