Make taps on subscriptions in multi-network header go to mobile page

This CL does 2 things:

-Makes the MobileNetworkActivity class capable of showing details for
 "available" in addition to just "active" networks. This is useful for
 dual-standby devices where one subscription is active and another is
 registered but not currently active. It also changes the title of this
 screen to be the network display name (defaults to the carrier name
 but can be customized by the user) instead of the generic "Mobile
 network".

-Wires up the subscription entries in the multi-network header (which
 only appears when a device has multiple subscriptions) so that taps on
 a subscription preference bring you to the MobileNetworkActivity screen
 to show details for that network.

Bug: 116349402
Test: make RunSettingsRoboTests
Change-Id: I0e985652c1d8ec3c597b6b6e4426d222e2ad5352

src/com/android/settings/network/SubscriptionsPreferenceController.java

@@ -20,10 +20,13 @@ import static androidx.lifecycle.Lifecycle.Event.ON_PAUSE;
 import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;
 
 import android.content.Context;
+import android.content.Intent;
+import android.provider.Settings;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 
 import com.android.settings.R;
+import com.android.settings.network.telephony.MobileNetworkActivity;
 import com.android.settingslib.core.AbstractPreferenceController;
 
 import java.util.Map;
@@ -125,7 +128,7 @@ public class SubscriptionsPreferenceController extends AbstractPreferenceControl
         mSubscriptionPreferences = new ArrayMap<>();
 
         int order = mStartOrder;
-        for (SubscriptionInfo info :  SubscriptionUtil.getAvailableSubscriptions(mManager) ) {
+        for (SubscriptionInfo info :  SubscriptionUtil.getAvailableSubscriptions(mManager)) {
             final int subId = info.getSubscriptionId();
             Preference pref = existingPrefs.remove(subId);
             if (pref == null) {
@@ -139,8 +142,9 @@ public class SubscriptionsPreferenceController extends AbstractPreferenceControl
             // TODO(asargent) - set summary here to indicate default for calls/sms and data
 
             pref.setOnPreferenceClickListener(clickedPref -> {
-                // TODO(asargent) - make this start MobileNetworkActivity once we've
-                // added support for it to take a subscription id
+                final Intent intent = new Intent(mContext, MobileNetworkActivity.class);
+                intent.putExtra(Settings.EXTRA_SUB_ID, subId);
+                mContext.startActivity(intent);
                 return true;
             });