Merge changes I9cae479a,Ie642d780

* changes:
  Remove the multi-SIM bottom nav in network and internet v2 mode
  Add page listing multiple mobile networks

res/layout/mobile_network_settings_container_v2.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2019 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <Toolbar
+        android:id="@+id/mobile_action_bar"
+        style="?android:attr/actionBarStyle"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:navigationContentDescription="@*android:string/action_bar_up_description"
+        android:theme="?android:attr/actionBarTheme"/>
+
+    <FrameLayout
+        android:id="@+id/main_content"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"/>
+
+</LinearLayout>

res/values/strings.xml

@@ -10344,6 +10344,34 @@
     <!-- Mobile network settings screen, title of Mobile data switch preference [CHAR LIMIT=NONE] -->
     <string name="mobile_data_settings_summary">Access data using mobile network</string>
 
+    <!-- Summary of the 'Mobile network' item on the Network & internet page when there is no mobile
+         service setup yet (eg no SIM card inserted and no eSIM configured). Tapping it leads to a
+         UI where the user can setup service. [CHAR LIMIT=50] -->
+    <string name="mobile_network_summary_add_a_network">Add a network</string>
+    <!-- Summary of the 'Mobile network' item on the Network & internet page when there is more than
+         one mobile service configured (aka "dual SIM") - it shows a count of SIM/eSIM and tapping
+         it leads to a page showing a list of the mobile service subscriptions. [CHAR LIMIT=40] -->
+    <plurals name="mobile_network_summary_count">
+        <item quantity="one"><xliff:g id="count" example="1">%1$d</xliff:g> SIM</item>
+        <item quantity="other"><xliff:g id="count" example="2">%1$d</xliff:g> SIMs</item>
+    </plurals>
+
+    <!-- Title of item shown at the bottom of the page listing multiple mobile service
+         subscriptions; tapping it leads to a UI to add more [CHAR LIMIT=40] -->
+    <string name="mobile_network_list_add_more">Add more</string>
+    <!-- Summary for an item in the page listing multiple mobile service subscriptions, indicating
+         that service is active and is tied to a physical SIM card [CHAR LIMIT=40] -->
+    <string name="mobile_network_active_sim">Active SIM</string>
+    <!-- Summary for an item in the page listing multiple mobile service subscriptions, indicating
+         that service is inactive and is tied to a physical SIM card [CHAR LIMIT=40] -->
+    <string name="mobile_network_inactive_sim">Inactive SIM</string>
+    <!-- Summary for an item in the page listing multiple mobile service subscriptions, indicating
+         that service is active and is tied to an eSIM profile [CHAR LIMIT=40] -->
+    <string name="mobile_network_active_esim">Active eSIM</string>
+    <!-- Summary for an item in the page listing multiple mobile service subscriptions, indicating
+         that service is inactive and is tied to an eSIM profile [CHAR LIMIT=40] -->
+    <string name="mobile_network_inactive_esim">Inactive eSIM</string>
+
     <!-- Title for preferred network type [CHAR LIMIT=NONE] -->
     <string name="preferred_network_mode_title">Preferred network type</string>
     <!-- Summary for preferred network type [CHAR LIMIT=NONE] -->

res/xml/mobile_network_list.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2019 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:key="mobile_network_list_screen"
+    android:title="@string/network_settings_title">
+
+    <Preference
+        android:key="add_more"
+        android:title="@string/mobile_network_list_add_more"
+        android:icon="@drawable/ic_menu_add"
+        android:order="100" />
+
+</PreferenceScreen>

res/xml/network_and_internet_v2.xml

@@ -40,15 +40,14 @@
     </com.android.settings.widget.MasterSwitchPreference>
 
     <com.android.settingslib.RestrictedPreference
-        android:key="mobile_network_settings"
+        android:key="mobile_network_list"
         android:title="@string/network_settings_title"
         android:summary="@string/summary_placeholder"
         android:icon="@drawable/ic_network_cell"
         android:order="-15"
         settings:keywords="@string/keywords_more_mobile_networks"
         settings:userRestriction="no_config_mobile_networks"
-        settings:useAdminDisabledSummary="true">
+        settings:useAdminDisabledSummary="true" />
-    </com.android.settingslib.RestrictedPreference>
 
     <com.android.settingslib.RestrictedSwitchPreference
         android:key="toggle_airplane"

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

@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+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 android.util.ArrayMap;
+
+import com.android.settings.R;
+import com.android.settings.network.telephony.MobileNetworkActivity;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.List;
+import java.util.Map;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+/**
+ * This populates the entries on a page which lists all available mobile subscriptions. Each entry
+ * has the name of the subscription with some subtext giving additional detail, and clicking on the
+ * entry brings you to a details page for that network.
+ */
+public class MobileNetworkListController extends AbstractPreferenceController implements
+        LifecycleObserver, SubscriptionsChangeListener.SubscriptionsChangeListenerClient {
+    private static final String TAG = "MobileNetworkListCtlr";
+
+    private SubscriptionManager mSubscriptionManager;
+    private SubscriptionsChangeListener mChangeListener;
+    private PreferenceScreen mPreferenceScreen;
+    private Map<Integer, Preference> mPreferences;
+
+    public MobileNetworkListController(Context context, Lifecycle lifecycle) {
+        super(context);
+        mSubscriptionManager = context.getSystemService(SubscriptionManager.class);
+        mChangeListener = new SubscriptionsChangeListener(context, this);
+        mPreferences = new ArrayMap<>();
+        lifecycle.addObserver(this);
+    }
+
+    @OnLifecycleEvent(ON_RESUME)
+    public void onResume() {
+        mChangeListener.start();
+        update();
+    }
+
+    @OnLifecycleEvent(ON_PAUSE)
+    public void onPause() {
+        mChangeListener.stop();
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreferenceScreen = screen;
+        update();
+    }
+
+    private void update() {
+        if (mPreferenceScreen == null) {
+            return;
+        }
+
+        // Since we may already have created some preferences previously, we first grab the list of
+        // those, then go through the current available subscriptions making sure they are all
+        // present in the screen, and finally remove any now-outdated ones.
+        final Map<Integer, Preference> existingPreferences = mPreferences;
+        mPreferences = new ArrayMap<>();
+
+        final List<SubscriptionInfo> subscriptions = SubscriptionUtil.getAvailableSubscriptions(
+                mSubscriptionManager);
+        for (SubscriptionInfo info : subscriptions) {
+            int subId = info.getSubscriptionId();
+            Preference pref = existingPreferences.remove(subId);
+            if (pref == null) {
+                pref = new Preference(mPreferenceScreen.getContext());
+                mPreferenceScreen.addPreference(pref);
+            }
+            pref.setTitle(info.getDisplayName());
+
+            if (info.isEmbedded()) {
+                if (mSubscriptionManager.isActiveSubscriptionId(subId)) {
+                    pref.setSummary(R.string.mobile_network_active_esim);
+                } else {
+                    pref.setSummary(R.string.mobile_network_inactive_esim);
+                }
+            } else {
+                if (mSubscriptionManager.isActiveSubscriptionId(subId)) {
+                    pref.setSummary(R.string.mobile_network_active_sim);
+                } else {
+                    pref.setSummary(R.string.mobile_network_inactive_sim);
+                }
+            }
+
+            pref.setOnPreferenceClickListener(clickedPref -> {
+                final Intent intent = new Intent(mContext, MobileNetworkActivity.class);
+                intent.putExtra(Settings.EXTRA_SUB_ID, info.getSubscriptionId());
+                mContext.startActivity(intent);
+                return true;
+            });
+            mPreferences.put(subId, pref);
+        }
+        for (Preference pref : existingPreferences.values()) {
+            mPreferenceScreen.removePreference(pref);
+        }
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return null;
+    }
+
+    @Override
+    public void onAirplaneModeChanged(boolean airplaneModeEnabled) {
+    }
+
+    @Override
+    public void onSubscriptionsChanged() {
+        update();
+    }
+}

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

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+import android.content.Context;
+import android.provider.SearchIndexableResource;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.search.SearchIndexable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
+public class MobileNetworkListFragment extends DashboardFragment {
+    private static final String LOG_TAG = "NetworkListFragment";
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.mobile_network_list;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return LOG_TAG;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        // TODO(asargent) - return SettingsEnums.MOBILE_NETWORK_LIST once the CL defining it has
+        // landed.
+        return 0;
+    }
+
+    @Override
+    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
+        controllers.add(new MobileNetworkListController(getContext(), getLifecycle()));
+        return controllers;
+    }
+
+    public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider() {
+                @Override
+                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
+                        boolean enabled) {
+                    final ArrayList<SearchIndexableResource> result = new ArrayList<>();
+                    final SearchIndexableResource sir = new SearchIndexableResource(context);
+                    sir.xmlResId = R.xml.mobile_network_list;
+                    result.add(sir);
+                    return result;
+                }
+            };
+}

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

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+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.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.List;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+public class MobileNetworkSummaryController extends AbstractPreferenceController implements
+        SubscriptionsChangeListener.SubscriptionsChangeListenerClient, LifecycleObserver {
+    private static final String TAG = "MobileNetSummaryCtlr";
+
+    private static final String KEY = "mobile_network_list";
+
+    private SubscriptionManager mSubscriptionManager;
+    private SubscriptionsChangeListener mChangeListener;
+    private PreferenceScreen mScreen;
+
+    /**
+     * This controls the summary text and click behavior of the "Mobile network" item on the
+     * Network & internet page. There are 3 separate cases depending on the number of mobile network
+     * subscriptions:
+     * <ul>
+     * <li>No subscription: click action begins a UI flow to add a network subscription, and
+     * the summary text indicates this</li>
+     *
+     * <li>One subscription: click action takes you to details for that one network, and
+     * the summary text is the network name</li>
+     *
+     * <li>More than one subscription: click action takes you to a page listing the subscriptions,
+     * and the summary text gives the count of SIMs</li>
+     * </ul>
+     */
+    public MobileNetworkSummaryController(Context context, Lifecycle lifecycle) {
+        super(context);
+        mSubscriptionManager = context.getSystemService(SubscriptionManager.class);
+        mChangeListener = new SubscriptionsChangeListener(context, this);
+        lifecycle.addObserver(this);
+    }
+
+    @OnLifecycleEvent(ON_RESUME)
+    public void onResume() {
+        mChangeListener.start();
+        update();
+    }
+
+    @OnLifecycleEvent(ON_PAUSE)
+    public void onPause() {
+        mChangeListener.stop();
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mScreen = screen;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        final List<SubscriptionInfo> subs = SubscriptionUtil.getAvailableSubscriptions(
+                mSubscriptionManager);
+        if (subs.isEmpty()) {
+            return mContext.getResources().getString(R.string.mobile_network_summary_add_a_network);
+        } else if (subs.size() == 1) {
+            return subs.get(0).getDisplayName();
+        } else {
+            final int count = subs.size();
+            return mContext.getResources().getQuantityString(R.plurals.mobile_network_summary_count,
+                    count, count);
+        }
+    }
+
+    private void update() {
+        if (mScreen != null) {
+            final Preference preference = mScreen.findPreference(getPreferenceKey());
+            refreshSummary(preference);
+            final List<SubscriptionInfo> subs = SubscriptionUtil.getAvailableSubscriptions(
+                    mSubscriptionManager);
+
+            preference.setOnPreferenceClickListener(null);
+            preference.setFragment(null);
+            if (subs.size() == 0) {
+                preference.setOnPreferenceClickListener((Preference pref) -> {
+                    // TODO(asargent) - need to get correct intent to fire here
+                    return true;
+                });
+            } else if (subs.size() == 1) {
+                preference.setOnPreferenceClickListener((Preference pref) -> {
+                    final Intent intent = new Intent(mContext, MobileNetworkActivity.class);
+                    mContext.startActivity(intent);
+                    return true;
+                });
+            } else {
+                preference.setFragment(MobileNetworkListFragment.class.getCanonicalName());
+            }
+        }
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public void onAirplaneModeChanged(boolean airplaneModeEnabled) {
+    }
+
+    @Override
+    public void onSubscriptionsChanged() {
+        update();
+    }
+}

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

@@ -96,8 +96,11 @@ public class NetworkDashboardFragment extends DashboardFragment implements
                 new MobilePlanPreferenceController(context, mobilePlanHost);
         final WifiMasterSwitchPreferenceController wifiPreferenceController =
                 new WifiMasterSwitchPreferenceController(context, metricsFeatureProvider);
-        final MobileNetworkPreferenceController mobileNetworkPreferenceController =
+        MobileNetworkPreferenceController mobileNetworkPreferenceController = null;
-                new MobileNetworkPreferenceController(context);
+        if (!FeatureFlagPersistent.isEnabled(context, FeatureFlags.NETWORK_INTERNET_V2)) {
+            mobileNetworkPreferenceController = new MobileNetworkPreferenceController(context);
+        }
+
         final VpnPreferenceController vpnPreferenceController =
                 new VpnPreferenceController(context);
         final PrivateDnsPreferenceController privateDnsPreferenceController =
@@ -106,13 +109,21 @@ public class NetworkDashboardFragment extends DashboardFragment implements
         if (lifecycle != null) {
             lifecycle.addObserver(mobilePlanPreferenceController);
             lifecycle.addObserver(wifiPreferenceController);
+            if (mobileNetworkPreferenceController != null) {
                 lifecycle.addObserver(mobileNetworkPreferenceController);
+            }
             lifecycle.addObserver(vpnPreferenceController);
             lifecycle.addObserver(privateDnsPreferenceController);
         }
 
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
+
+        if (FeatureFlagPersistent.isEnabled(context, FeatureFlags.NETWORK_INTERNET_V2)) {
+            controllers.add(new MobileNetworkSummaryController(context, lifecycle));
+        }
+        if (mobileNetworkPreferenceController != null) {
             controllers.add(mobileNetworkPreferenceController);
+        }
         controllers.add(new TetherPreferenceController(context, lifecycle));
         controllers.add(vpnPreferenceController);
         controllers.add(new ProxyPreferenceController(context));

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

@@ -37,7 +37,9 @@ import androidx.fragment.app.FragmentTransaction;
 import com.android.internal.telephony.TelephonyIntents;
 import com.android.internal.util.CollectionUtils;
 import com.android.settings.R;
+import com.android.settings.core.FeatureFlags;
 import com.android.settings.core.SettingsBaseActivity;
+import com.android.settings.development.featureflags.FeatureFlagPersistent;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 
@@ -77,7 +79,11 @@ public class MobileNetworkActivity extends SettingsBaseActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        if (FeatureFlagPersistent.isEnabled(this, FeatureFlags.NETWORK_INTERNET_V2)) {
+            setContentView(R.layout.mobile_network_settings_container_v2);
+        } else {
             setContentView(R.layout.mobile_network_settings_container);
+        }
         setActionBar(findViewById(R.id.mobile_action_bar));
         mPhoneChangeReceiver = new PhoneChangeReceiver();
         mSubscriptionManager = getSystemService(SubscriptionManager.class);
@@ -132,7 +138,9 @@ public class MobileNetworkActivity extends SettingsBaseActivity {
     void updateSubscriptions(Bundle savedInstanceState) {
         mSubscriptionInfos = mSubscriptionManager.getActiveSubscriptionInfoList();
 
+        if (!FeatureFlagPersistent.isEnabled(this, FeatureFlags.NETWORK_INTERNET_V2)) {
             updateBottomNavigationView();
+        }
 
         if (savedInstanceState == null) {
             switchFragment(new MobileNetworkSettings(), getSubscriptionId());

tests/robotests/src/com/android/settings/network/MobileNetworkListControllerTest.java

@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+import static android.provider.Settings.EXTRA_SUB_ID;
+import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.telephony.SubscriptionInfo;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+
+import java.util.Arrays;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+@RunWith(RobolectricTestRunner.class)
+public class MobileNetworkListControllerTest {
+    @Mock
+    private Lifecycle mLifecycle;
+
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+
+    private Context mContext;
+    private MobileNetworkListController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(Robolectric.setupActivity(Activity.class));
+        when(mPreferenceScreen.getContext()).thenReturn(mContext);
+        mController = new MobileNetworkListController(mContext, mLifecycle);
+    }
+
+    @After
+    public void tearDown() {
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(null);
+    }
+
+    @Test
+    public void displayPreference_noSubscriptions_noCrash() {
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+    }
+
+    @Test
+    public void displayPreference_twoSubscriptions_correctlySetup() {
+        final SubscriptionInfo sub1 = createMockSubscription(1, "sub1");
+        final SubscriptionInfo sub2 = createMockSubscription(2, "sub2");
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+
+        // Check that the preferences get created with the correct titles.
+        final ArgumentCaptor<Preference> preferenceCaptor = ArgumentCaptor.forClass(
+                Preference.class);
+        verify(mPreferenceScreen, times(2)).addPreference(preferenceCaptor.capture());
+        final Preference pref1 = preferenceCaptor.getAllValues().get(0);
+        final Preference pref2 = preferenceCaptor.getAllValues().get(1);
+        assertThat(pref1.getTitle()).isEqualTo("sub1");
+        assertThat(pref2.getTitle()).isEqualTo("sub2");
+
+        // Check that the onclick listeners are setup to fire with the right subscription id.
+        final ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+        pref1.getOnPreferenceClickListener().onPreferenceClick(pref1);
+        pref2.getOnPreferenceClickListener().onPreferenceClick(pref2);
+        verify(mContext, times(2)).startActivity(intentCaptor.capture());
+        final Intent intent1 = intentCaptor.getAllValues().get(0);
+        final Intent intent2 = intentCaptor.getAllValues().get(1);
+        assertThat(intent1.getIntExtra(EXTRA_SUB_ID, INVALID_SUBSCRIPTION_ID)).isEqualTo(1);
+        assertThat(intent2.getIntExtra(EXTRA_SUB_ID, INVALID_SUBSCRIPTION_ID)).isEqualTo(2);
+    }
+
+    @Test
+    public void onSubscriptionsChanged_twoSubscriptionsOneChangesName_preferenceUpdated() {
+        final SubscriptionInfo sub1 = createMockSubscription(1, "sub1");
+        final SubscriptionInfo sub2 = createMockSubscription(2, "sub2");
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        final ArgumentCaptor<Preference> preferenceCaptor = ArgumentCaptor.forClass(
+                Preference.class);
+        verify(mPreferenceScreen, times(2)).addPreference(preferenceCaptor.capture());
+
+        when(sub2.getDisplayName()).thenReturn("new name");
+        mController.onSubscriptionsChanged();
+        assertThat(preferenceCaptor.getAllValues().get(1).getTitle()).isEqualTo("new name");
+    }
+
+    @Test
+    public void onSubscriptionsChanged_startWithThreeSubsAndRemoveOne_correctPreferenceRemoved() {
+        final SubscriptionInfo sub1 = createMockSubscription(1, "sub1");
+        final SubscriptionInfo sub2 = createMockSubscription(2, "sub2");
+        final SubscriptionInfo sub3 = createMockSubscription(3, "sub3");
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2, sub3));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        final ArgumentCaptor<Preference> preferenceCaptor = ArgumentCaptor.forClass(
+                Preference.class);
+        verify(mPreferenceScreen, times(3)).addPreference(preferenceCaptor.capture());
+
+        // remove sub2, and check that the second pref was removed from the screen
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub3));
+        mController.onSubscriptionsChanged();
+        final ArgumentCaptor<Preference> removedPrefCaptor = ArgumentCaptor.forClass(
+                Preference.class);
+        verify(mPreferenceScreen).removePreference(removedPrefCaptor.capture());
+        assertThat(removedPrefCaptor.getValue().getTitle()).isEqualTo("sub2");
+    }
+
+    private SubscriptionInfo createMockSubscription(int id, String displayName) {
+        final SubscriptionInfo sub = mock(SubscriptionInfo.class);
+        when(sub.getSubscriptionId()).thenReturn(id);
+        when(sub.getDisplayName()).thenReturn(displayName);
+        return sub;
+    }
+}

tests/robotests/src/com/android/settings/network/MobileNetworkSummaryControllerTest.java

@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.telephony.SubscriptionInfo;
+
+import com.android.settings.network.telephony.MobileNetworkActivity;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+
+import java.util.Arrays;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+@RunWith(RobolectricTestRunner.class)
+public class MobileNetworkSummaryControllerTest {
+    @Mock
+    private Lifecycle mLifecycle;
+    @Mock
+    PreferenceScreen mPreferenceScreen;
+
+    Preference mPreference;
+
+    private Context mContext;
+    private MobileNetworkSummaryController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(Robolectric.setupActivity(Activity.class));
+        mController = new MobileNetworkSummaryController(mContext, mLifecycle);
+        mPreference = new Preference(mContext);
+        mPreference.setKey(mController.getPreferenceKey());
+        when(mPreferenceScreen.findPreference(eq(mController.getPreferenceKey()))).thenReturn(
+                mPreference);
+    }
+
+    @After
+    public void tearDown() {
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(null);
+    }
+
+    @Test
+    public void getSummary_noSubscriptions_correctSummary() {
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("Add a network");
+    }
+
+    @Test
+    public void getSummary_oneSubscription_correctSummaryAndClickHandler() {
+        SubscriptionInfo sub1 = mock(SubscriptionInfo.class);
+        when(sub1.getSubscriptionId()).thenReturn(1);
+        when(sub1.getDisplayName()).thenReturn("sub1");
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("sub1");
+        assertThat(mPreference.getFragment()).isNull();
+        mPreference.getOnPreferenceClickListener().onPreferenceClick(mPreference);
+        ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+        verify(mContext).startActivity(intentCaptor.capture());
+        assertThat(intentCaptor.getValue().getComponent().getClassName()).isEqualTo(
+                MobileNetworkActivity.class.getName());
+    }
+
+    @Test
+    public void getSummary_twoSubscriptions_correctSummaryAndFragment() {
+        SubscriptionInfo sub1 = mock(SubscriptionInfo.class);
+        SubscriptionInfo sub2 = mock(SubscriptionInfo.class);
+        when(sub1.getSubscriptionId()).thenReturn(1);
+        when(sub2.getSubscriptionId()).thenReturn(2);
+
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("2 SIMs");
+        assertThat(mPreference.getFragment()).isEqualTo(MobileNetworkListFragment.class.getName());
+    }
+
+    @Test
+    public void getSummaryAfterUpdate_twoSubscriptionsBecomesOne_correctSummaryAndFragment() {
+        SubscriptionInfo sub1 = mock(SubscriptionInfo.class);
+        SubscriptionInfo sub2 = mock(SubscriptionInfo.class);
+        when(sub1.getSubscriptionId()).thenReturn(1);
+        when(sub2.getSubscriptionId()).thenReturn(2);
+        when(sub1.getDisplayName()).thenReturn("sub1");
+        when(sub2.getDisplayName()).thenReturn("sub2");
+
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("2 SIMs");
+        assertThat(mPreference.getFragment()).isEqualTo(MobileNetworkListFragment.class.getName());
+
+        // Simulate sub2 having disappeared - the end result should change to be the same as
+        // if there were just one subscription.
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1));
+        mController.onSubscriptionsChanged();
+        assertThat(mController.getSummary()).isEqualTo("sub1");
+        assertThat(mPreference.getFragment()).isNull();
+        mPreference.getOnPreferenceClickListener().onPreferenceClick(mPreference);
+        ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+        verify(mContext).startActivity(intentCaptor.capture());
+        assertThat(intentCaptor.getValue().getComponent().getClassName()).isEqualTo(
+                MobileNetworkActivity.class.getName());
+    }
+
+    @Test
+    public void getSummaryAfterUpdate_oneSubscriptionBecomesTwo_correctSummaryAndFragment() {
+        SubscriptionInfo sub1 = mock(SubscriptionInfo.class);
+        SubscriptionInfo sub2 = mock(SubscriptionInfo.class);
+        when(sub1.getSubscriptionId()).thenReturn(1);
+        when(sub2.getSubscriptionId()).thenReturn(2);
+        when(sub1.getDisplayName()).thenReturn("sub1");
+        when(sub2.getDisplayName()).thenReturn("sub2");
+
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("sub1");
+        assertThat(mPreference.getFragment()).isNull();
+        mPreference.getOnPreferenceClickListener().onPreferenceClick(mPreference);
+        ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+        verify(mContext).startActivity(intentCaptor.capture());
+        assertThat(intentCaptor.getValue().getComponent().getClassName()).isEqualTo(
+                MobileNetworkActivity.class.getName());
+
+        // Simulate sub2 appearing in the list of subscriptions and check the results.
+        SubscriptionUtil.setAvailableSubscriptionsForTesting(Arrays.asList(sub1, sub2));
+        mController.displayPreference(mPreferenceScreen);
+        mController.onResume();
+        assertThat(mController.getSummary()).isEqualTo("2 SIMs");
+        assertThat(mPreference.getFragment()).isEqualTo(MobileNetworkListFragment.class.getName());
+    }
+}