Base implementation of WFC disclaimer UI

Test: manual - Check that no error occurred when changing the wifi
calling settings to turn on.
Test: auto - Passed WifiCallingSettingsForSubTest,
WifiCallingDisclaimerFragmentTest and DisclaimerItemListAdapterTest.
Bug: 67872298

Change-Id: I789f530d3e16baa6e56feaa4269f6696976f747e

AndroidManifest.xml

@@ -3124,6 +3124,18 @@
 
         <activity android:name=".homepage.contextualcards.ContextualCardFeedbackDialog"
                   android:theme="@android:style/Theme.DeviceDefault.Light.Dialog.Alert" />
+
+        <activity
+            android:name="Settings$WifiCallingDisclaimerActivity"
+            android:label="@string/wifi_calling_settings_title"
+            android:taskAffinity="com.android.settings">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                android:value="com.android.settings.wifi.calling.WifiCallingDisclaimerFragment" />
+        </activity>
         <!-- This is the longest AndroidManifest.xml ever. -->
     </application>
 </manifest>

res/layout/wfc_disclaimer_fragment.xml

@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginBottom="20dp"
+        android:textAppearance="?android:attr/textAppearanceLarge"
+        android:text="@string/wfc_disclaimer_title_text" />
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:background="?android:attr/listDivider" />
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/disclaimer_item_list"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
+
+    <LinearLayout
+        android:orientation="horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" >
+
+        <Button
+            android:id="@+id/disagree_button"
+            style="@style/DisclaimerNegativeButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:text="@string/wfc_disclaimer_disagree_text" />
+
+        <Space
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+
+        <Button
+            android:id="@+id/agree_button"
+            style="@style/DisclaimerPositiveButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:text="@string/wfc_disclaimer_agree_button_text" />
+    </LinearLayout>
+</LinearLayout>

res/layout/wfc_simple_disclaimer_item.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:paddingTop="16dp"
+    android:paddingBottom="20dp"
+    android:paddingStart="16dp"
+    android:paddingEnd="16dp"
+    android:gravity="center_vertical">
+    <TextView
+        android:id="@+id/disclaimer_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textAppearance="@android:style/TextAppearance.Material.Subhead" />
+    <TextView
+        android:id="@+id/disclaimer_desc"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textAppearance="@android:style/TextAppearance.Material.Body1"
+        android:textColor="?android:attr/textColorSecondary"
+        android:layout_below="@id/disclaimer_title" />
+</RelativeLayout>

res/values/strings.xml

@@ -10758,6 +10758,15 @@
     <!-- Summary for represent which device is playing media [CHAR LIMIT=NONE] -->
     <string name="media_output_panel_summary_of_playing_device">Currently playing on <xliff:g id="device_name" example="Bose headphone">%1$s</xliff:g></string>
 
+    <!-- Label for the title on wfc disclaimer fragment. [CHAR LIMIT=40] -->
+    <string name="wfc_disclaimer_title_text">Important information</string>
+
+    <!-- Label for the agree button on wfc disclaimer fragment. [CHAR LIMIT=30] -->
+    <string name="wfc_disclaimer_agree_button_text">CONTINUE</string>
+
+    <!-- Label for the disagree button on wfc disclaimer fragment. [CHAR LIMIT=30] -->
+    <string name="wfc_disclaimer_disagree_text">NO THANKS</string>
+
     <!-- Message for forget passpoint dialog [CHAR LIMIT=none] -->
     <string name="forget_passpoint_dialog_message">You may lose access to any remaining time or data. Check with your provider before removing.</string>
 

res/values/styles.xml

@@ -520,4 +520,17 @@
         <!-- Padding between content and the start icon is 8dp. -->
         <item name="contentStartPadding">8dp</item>
     </style>
+
+    <style name="DisclaimerPositiveButton" parent="@style/SudGlifButton.Primary">
+        <item name="android:layout_margin">16dp</item>
+        <item name="android:paddingStart">8dp</item>
+        <item name="android:paddingEnd">8dp</item>
+    </style>
+
+    <style name="DisclaimerNegativeButton" parent="@style/SudGlifButton.Secondary">
+        <item name="android:layout_margin">16dp</item>
+        <item name="android:paddingStart">8dp</item>
+        <item name="android:paddingEnd">8dp</item>
+    </style>
+
 </resources>

src/com/android/settings/Settings.java

@@ -159,6 +159,7 @@ public class Settings extends SettingsActivity {
     public static class WebViewAppPickerActivity extends SettingsActivity { /* empty */ }
     public static class AdvancedConnectedDeviceActivity extends SettingsActivity { /* empty */ }
     public static class BluetoothDeviceDetailActivity extends SettingsActivity { /* empty */ }
+    public static class WifiCallingDisclaimerActivity extends SettingsActivity { /* empty */ }
 
     // Top level categories for new IA
     public static class NetworkDashboardActivity extends SettingsActivity {}

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -135,6 +135,7 @@ import com.android.settings.wifi.ConfigureWifiSettings;
 import com.android.settings.wifi.WifiAPITest;
 import com.android.settings.wifi.WifiInfo;
 import com.android.settings.wifi.WifiSettings;
+import com.android.settings.wifi.calling.WifiCallingDisclaimerFragment;
 import com.android.settings.wifi.calling.WifiCallingSettings;
 import com.android.settings.wifi.p2p.WifiP2pSettings;
 import com.android.settings.wifi.savedaccesspoints.SavedAccessPointsWifiSettings;
@@ -260,6 +261,7 @@ public class SettingsGateway {
             ConnectedDeviceDashboardFragment.class.getName(),
             UsbDetailsFragment.class.getName(),
             AppAndNotificationDashboardFragment.class.getName(),
+            WifiCallingDisclaimerFragment.class.getName(),
             AccountDashboardFragment.class.getName(),
             EnterprisePrivacySettings.class.getName(),
             WebViewAppPicker.class.getName(),

src/com/android/settings/wifi/calling/DisclaimerItem.java

@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.PersistableBundle;
+import android.telephony.CarrierConfigManager;
+import android.util.Log;
+
+import com.android.internal.annotations.VisibleForTesting;
+
+/**
+ * Interface to control disclaimer item from {@link WifiCallingDisclaimerFragment}.
+ */
+@VisibleForTesting
+public abstract class DisclaimerItem {
+    private static final String SHARED_PREFERENCES_NAME = "wfc_disclaimer_prefs";
+
+    protected final Context mContext;
+    protected final int mSubId;
+    private final CarrierConfigManager mCarrierConfigManager;
+
+    DisclaimerItem(Context context, int subId) {
+        mContext = context;
+        mSubId = subId;
+        mCarrierConfigManager = mContext.getSystemService(CarrierConfigManager.class);
+    }
+
+    /**
+     * Called by the {@link WifiCallingDisclaimerFragment} when a user has clicked the agree button.
+     */
+    void onAgreed() {
+        setBooleanSharedPrefs(getPrefKey(), true);
+    }
+
+    /**
+     * Checks whether the disclaimer item need to be displayed or not.
+     *
+     * @return Returns {@code true} if disclaimer item need to be displayed,
+     * {@code false} if not displayed.
+     */
+    boolean shouldShow() {
+        if (getBooleanSharedPrefs(getPrefKey(), false)) {
+            logd("shouldShow: false due to a user has already agreed.");
+            return false;
+        }
+        logd("shouldShow: true");
+        return true;
+    }
+
+    /**
+     * Gets the configuration values for a particular sub id.
+     *
+     * @return The {@link PersistableBundle} instance containing the config value for a
+     * particular phone id, or default values.
+     */
+    protected PersistableBundle getCarrierConfig() {
+        PersistableBundle config = mCarrierConfigManager.getConfigForSubId(mSubId);
+        if (config != null) {
+            return config;
+        }
+        // Return static default defined in CarrierConfigManager.
+        return CarrierConfigManager.getDefaultConfig();
+    }
+
+    protected void logd(String msg) {
+        Log.d(getName(), "[" + mSubId +  "] " + msg);
+    }
+
+    /**
+     * Gets a title id for disclaimer item.
+     *
+     * @return Title id for disclaimer item.
+     */
+    protected abstract int getTitleId();
+
+    /**
+     * Gets a message id for disclaimer item.
+     *
+     * @return Message id for disclaimer item.
+     */
+    protected abstract int getMessageId();
+
+    /**
+     * Gets a name of disclaimer item.
+     *
+     * @return Name of disclaimer item.
+     */
+    protected abstract String getName();
+
+    /**
+     * Gets a preference key to keep user's consent.
+     *
+     * @return Preference key to keep user's consent.
+     */
+    protected abstract String getPrefKey();
+
+    /**
+     * Gets the boolean value from shared preferences.
+     *
+     * @param key The key for the preference item.
+     * @param defValue Value to return if this preference does not exist.
+     * @return The boolean value of corresponding key, or defValue.
+     */
+    private boolean getBooleanSharedPrefs(String key, boolean defValue) {
+        SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFERENCES_NAME,
+                Context.MODE_PRIVATE);
+        return prefs.getBoolean(key + mSubId, defValue);
+    }
+
+    /**
+     * Sets the boolean value to shared preferences.
+     *
+     * @param key The key for the preference item.
+     * @param value The value to be set for shared preferences.
+     */
+    private void setBooleanSharedPrefs(String key, boolean value) {
+        SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFERENCES_NAME,
+                Context.MODE_PRIVATE);
+        prefs.edit().putBoolean(key + mSubId, value).apply();
+    }
+}

src/com/android/settings/wifi/calling/DisclaimerItemFactory.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import android.content.Context;
+
+import com.android.internal.annotations.VisibleForTesting;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Factory class to create disclaimer items list.
+ */
+@VisibleForTesting
+public final class DisclaimerItemFactory {
+
+    /**
+     * Creates disclaimer items list.
+     *
+     * @param context The application context
+     * @param subId The subscription id.
+     * @return The {@link DisclaimerItem} list instance, if there are no items, return empty list.
+     */
+    public static List<DisclaimerItem> create(Context context, int subId) {
+        List<DisclaimerItem> itemList = getDisclaimerItemList(context, subId);
+        Iterator itr = itemList.iterator();
+        while (itr.hasNext()) {
+            DisclaimerItem item = (DisclaimerItem) itr.next();
+            if (!item.shouldShow()) {
+                itr.remove();
+            }
+        }
+        return itemList;
+    }
+
+    private static List<DisclaimerItem> getDisclaimerItemList(Context context, int subId) {
+        List<DisclaimerItem> itemList = new ArrayList<DisclaimerItem>();
+
+        return itemList;
+    }
+}

src/com/android/settings/wifi/calling/DisclaimerItemListAdapter.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.R;
+
+import java.util.List;
+
+/**
+ * Adapter for disclaimer items list.
+ */
+public class DisclaimerItemListAdapter extends
+        RecyclerView.Adapter<DisclaimerItemListAdapter.DisclaimerItemViewHolder> {
+
+    private List<DisclaimerItem> mDisclaimerItemList;
+
+    public DisclaimerItemListAdapter(List<DisclaimerItem> list) {
+        mDisclaimerItemList = list;
+    }
+
+    @Override
+    public DisclaimerItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(
+                Context.LAYOUT_INFLATER_SERVICE);
+        View view = inflater.inflate(R.layout.wfc_simple_disclaimer_item, null, false);
+        return new DisclaimerItemViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(DisclaimerItemViewHolder holder, int position) {
+        holder.titleView.setText(mDisclaimerItemList.get(position).getTitleId());
+        holder.descriptionView.setText(mDisclaimerItemList.get(position).getMessageId());
+    }
+
+    @Override
+    public int getItemCount() {
+        return mDisclaimerItemList.size();
+    }
+
+    public static class DisclaimerItemViewHolder extends RecyclerView.ViewHolder {
+        @VisibleForTesting
+        static final int ID_DISCLAIMER_ITEM_TITLE = R.id.disclaimer_title;
+        @VisibleForTesting
+        static final int ID_DISCLAIMER_ITEM_DESCRIPTION = R.id.disclaimer_desc;
+
+        public final TextView titleView;
+        public final TextView descriptionView;
+
+        public DisclaimerItemViewHolder(View itemView) {
+            super(itemView);
+            titleView = itemView.findViewById(ID_DISCLAIMER_ITEM_TITLE);
+            descriptionView = itemView.findViewById(ID_DISCLAIMER_ITEM_DESCRIPTION);
+        }
+    }
+}

src/com/android/settings/wifi/calling/WifiCallingDisclaimerFragment.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.telephony.SubscriptionManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+import androidx.recyclerview.widget.DividerItemDecoration;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.settings.R;
+import com.android.settings.core.InstrumentedFragment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Fragment for displaying disclaimers for WFC.
+ */
+public class WifiCallingDisclaimerFragment extends InstrumentedFragment
+        implements View.OnClickListener {
+    private static final String TAG = "WifiCallingDisclaimerFragment";
+
+    private static final String STATE_IS_SCROLL_TO_BOTTOM = "state_is_scroll_to_bottom";
+
+    private List<DisclaimerItem> mDisclaimerItemList = new ArrayList<DisclaimerItem>();
+    private Button mAgreeButton;
+    private Button mDisagreeButton;
+    private boolean mScrollToBottom;
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsEvent.WIFI_CALLING;
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Bundle args = getArguments();
+        final int subId = (args != null) ? args.getInt(WifiCallingSettingsForSub.EXTRA_SUB_ID)
+                : SubscriptionManager.DEFAULT_SUBSCRIPTION_ID;
+
+        mDisclaimerItemList = DisclaimerItemFactory.create(getActivity(), subId);
+        if (mDisclaimerItemList.isEmpty()) {
+            finish(Activity.RESULT_OK);
+            return;
+        }
+
+        if (savedInstanceState != null) {
+            mScrollToBottom = savedInstanceState.getBoolean(
+                    STATE_IS_SCROLL_TO_BOTTOM, mScrollToBottom);
+        }
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+
+        final View view = inflater.inflate(R.layout.wfc_disclaimer_fragment, container, false);
+
+        mAgreeButton = view.findViewById(R.id.agree_button);
+        mAgreeButton.setOnClickListener(this);
+        mDisagreeButton = view.findViewById(R.id.disagree_button);
+        mDisagreeButton.setOnClickListener(this);
+
+        final RecyclerView recyclerView = (RecyclerView) view.findViewById(
+                R.id.disclaimer_item_list);
+        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
+        recyclerView.setAdapter(new DisclaimerItemListAdapter(mDisclaimerItemList));
+
+        RecyclerView.ItemDecoration itemDecoration =
+                new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL);
+        recyclerView.addItemDecoration(itemDecoration);
+
+        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+                super.onScrolled(recyclerView, dx, dy);
+                if (!recyclerView.canScrollVertically(1 /* scrolling down */)) {
+                    mScrollToBottom = true;
+                    updateButtonState();
+                    recyclerView.removeOnScrollListener(this);
+                }
+            }
+        });
+
+        return view;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        updateButtonState();
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(STATE_IS_SCROLL_TO_BOTTOM, mScrollToBottom);
+    }
+
+    private void updateButtonState() {
+        mAgreeButton.setEnabled(mScrollToBottom);
+    }
+
+    @Override
+    public void onClick(View v) {
+        if (v == mAgreeButton) {
+            for (DisclaimerItem item : mDisclaimerItemList) {
+                item.onAgreed();
+            }
+            finish(Activity.RESULT_OK);
+        } else if (v == mDisagreeButton) {
+            finish(Activity.RESULT_CANCELED);
+        }
+    }
+
+    @VisibleForTesting
+    void finish(int result) {
+        Activity activity = getActivity();
+        activity.setResult(result, null);
+        activity.finish();
+    }
+}

src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java

@@ -53,6 +53,7 @@ import com.android.settings.R;
 import com.android.settings.SettingsActivity;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.Utils;
+import com.android.settings.core.SubSettingLauncher;
 import com.android.settings.widget.SwitchBar;
 
 /**
@@ -69,9 +70,13 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
     private static final String BUTTON_WFC_ROAMING_MODE = "wifi_calling_roaming_mode";
     private static final String PREFERENCE_EMERGENCY_ADDRESS = "emergency_address_key";
 
-    private static final int REQUEST_CHECK_WFC_EMERGENCY_ADDRESS = 1;
+    @VisibleForTesting
+    static final int REQUEST_CHECK_WFC_EMERGENCY_ADDRESS = 1;
+    @VisibleForTesting
+    static final int REQUEST_CHECK_WFC_DISCLAIMER = 2;
 
     public static final String EXTRA_LAUNCH_CARRIER_APP = "EXTRA_LAUNCH_CARRIER_APP";
+    public static final String EXTRA_SUB_ID = "EXTRA_SUB_ID";
 
     protected static final String FRAGMENT_BUNDLE_SUBID = "subId";
 
@@ -172,7 +177,7 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
 
         mEmptyView = getView().findViewById(android.R.id.empty);
         setEmptyView(mEmptyView);
-        final Resources res = SubscriptionManager.getResourcesForSubId(getContext(), mSubId);
+        final Resources res = getResourcesForSubId();
         String emptyViewText = res.getString(R.string.wifi_calling_off_explanation,
                 res.getString(R.string.wifi_calling_off_explanation_2));
         mEmptyView.setText(emptyViewText);
@@ -416,14 +421,17 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
             return;
         }
 
-        // Call address management activity before turning on WFC
+        // Launch disclaimer fragment before turning on WFC
-        Intent carrierAppIntent = getCarrierActivityIntent();
+        final Context context = getActivity();
-        if (carrierAppIntent != null) {
+        final Bundle args = new Bundle();
-            carrierAppIntent.putExtra(EXTRA_LAUNCH_CARRIER_APP, LAUCH_APP_ACTIVATE);
+        args.putInt(EXTRA_SUB_ID, mSubId);
-            startActivityForResult(carrierAppIntent, REQUEST_CHECK_WFC_EMERGENCY_ADDRESS);
+        new SubSettingLauncher(context)
-        } else {
+                .setDestination(WifiCallingDisclaimerFragment.class.getName())
-            updateWfcMode(true);
+                .setArguments(args)
-        }
+                .setTitleRes(R.string.wifi_calling_settings_title)
+                .setSourceMetricsCategory(getMetricsCategory())
+                .setResultListener(this, REQUEST_CHECK_WFC_DISCLAIMER)
+                .launch();
     }
 
     /*
@@ -476,12 +484,30 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
 
         final Context context = getActivity();
 
-        if (requestCode == REQUEST_CHECK_WFC_EMERGENCY_ADDRESS) {
+        Log.d(TAG, "WFC activity request = " + requestCode + " result = " + resultCode);
-            Log.d(TAG, "WFC emergency address activity result = " + resultCode);
 
-            if (resultCode == Activity.RESULT_OK) {
+        switch (requestCode) {
-                updateWfcMode(true);
+            case REQUEST_CHECK_WFC_EMERGENCY_ADDRESS:
-            }
+                if (resultCode == Activity.RESULT_OK) {
+                    updateWfcMode(true);
+                }
+                break;
+            case REQUEST_CHECK_WFC_DISCLAIMER:
+                if (resultCode == Activity.RESULT_OK) {
+                    // Call address management activity before turning on WFC
+                    Intent carrierAppIntent = getCarrierActivityIntent();
+                    if (carrierAppIntent != null) {
+                        carrierAppIntent.putExtra(EXTRA_LAUNCH_CARRIER_APP, LAUCH_APP_ACTIVATE);
+                        startActivityForResult(carrierAppIntent,
+                                REQUEST_CHECK_WFC_EMERGENCY_ADDRESS);
+                    } else {
+                        updateWfcMode(true);
+                    }
+                }
+                break;
+            default:
+                Log.e(TAG, "Unexpected request: " + requestCode);
+                break;
         }
     }
 
@@ -568,4 +594,9 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
         }
         return resId;
     }
+
+    @VisibleForTesting
+    Resources getResourcesForSubId() {
+        return SubscriptionManager.getResourcesForSubId(getContext(), mSubId, false);
+    }
 }

tests/robotests/src/com/android/settings/testutils/shadow/ShadowDisclaimerItemFactory.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2018 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.testutils.shadow;
+
+import android.content.Context;
+
+import com.android.settings.wifi.calling.DisclaimerItemFactory;
+import com.android.settings.wifi.calling.DisclaimerItem;
+
+import java.util.List;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+@Implements(DisclaimerItemFactory.class)
+public final class ShadowDisclaimerItemFactory {
+    private static List<DisclaimerItem> sMockDisclaimerItemList;
+
+    public static void setDisclaimerItemList(List<DisclaimerItem> list) {
+        sMockDisclaimerItemList = list;
+    }
+
+    @Implementation
+    public static List<DisclaimerItem> create(Context context, int subId) {
+        return sMockDisclaimerItemList;
+    }
+}

tests/robotests/src/com/android/settings/wifi/calling/DisclaimerItemListAdapterTest.java

@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import static com.android.settings.wifi.calling.DisclaimerItemListAdapter
+        .DisclaimerItemViewHolder.ID_DISCLAIMER_ITEM_TITLE;
+import static com.android.settings.wifi.calling.DisclaimerItemListAdapter
+        .DisclaimerItemViewHolder.ID_DISCLAIMER_ITEM_DESCRIPTION;
+import static org.mockito.Matchers.anyBoolean;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyObject;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import com.android.settings.R;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+
+@RunWith(RobolectricTestRunner.class)
+public class DisclaimerItemListAdapterTest {
+
+    private static final int ITEM_POSITION = 0;
+    private static final int DISCLAIMER_TITLE_STRING_ID = 0;
+    private static final int DISCLAIMER_MESSAGE_STRING_ID = 1;
+
+    @Mock
+    private LayoutInflater mLayoutInflater;
+    @Mock
+    private TextView mTestView;
+    @Mock
+    private TextView mDescView;
+    @Mock
+    private View mView;
+    @Mock
+    private ViewGroup mViewGroup;
+    @Mock
+    private Context mContext;
+
+    private MockDisclaimerItem mDisclaimerItem;
+    private DisclaimerItemListAdapter mDisclaimerItemListAdapter;
+    private List<DisclaimerItem> mDisclaimerItemList = new ArrayList<>();
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mDisclaimerItem = spy(new MockDisclaimerItem(mContext, 0 /* subId */));
+        mDisclaimerItemList.add(mDisclaimerItem);
+
+        when(mLayoutInflater.inflate(anyInt(), anyObject(), anyBoolean())).thenReturn(mView);
+        when(mViewGroup.getContext()).thenReturn(mContext);
+        when(mViewGroup.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).thenReturn(
+                mLayoutInflater);
+        when(mView.findViewById(ID_DISCLAIMER_ITEM_TITLE)).thenReturn(mTestView);
+        when(mView.findViewById(ID_DISCLAIMER_ITEM_DESCRIPTION)).thenReturn(mDescView);
+    }
+
+    @Test
+    public void onBindViewHolder_haveItem_shouldSetText() {
+        final DisclaimerItemListAdapter.DisclaimerItemViewHolder viewHolder =
+                new DisclaimerItemListAdapter.DisclaimerItemViewHolder(mView);
+
+        mDisclaimerItemListAdapter = new DisclaimerItemListAdapter(mDisclaimerItemList);
+        mDisclaimerItemListAdapter.onCreateViewHolder(mViewGroup, 0 /* viewType */);
+        mDisclaimerItemListAdapter.onBindViewHolder(viewHolder, ITEM_POSITION);
+
+        // Check the text is set when the DisclaimerItem exists.
+        verify(viewHolder.titleView).setText(DISCLAIMER_TITLE_STRING_ID);
+        verify(viewHolder.descriptionView).setText(DISCLAIMER_MESSAGE_STRING_ID);
+    }
+
+    private class MockDisclaimerItem extends DisclaimerItem {
+        MockDisclaimerItem(Context context, int subId) {
+            super(context, subId);
+        }
+
+        @Override
+        protected int getTitleId() {
+            return DISCLAIMER_TITLE_STRING_ID;
+        }
+
+        @Override
+        protected int getMessageId() {
+            return DISCLAIMER_MESSAGE_STRING_ID;
+        }
+
+        @Override
+        protected String getName() {
+            return "MockDisclaimerItem";
+        }
+
+        @Override
+        protected String getPrefKey() {
+            return "mock_pref_key";
+        }
+    }
+}

tests/robotests/src/com/android/settings/wifi/calling/WifiCallingDisclaimerFragmentTest.java

@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2018 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.wifi.calling;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyBoolean;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyObject;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
+
+import com.android.settings.R;
+import com.android.settings.testutils.shadow.ShadowDisclaimerItemFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = ShadowDisclaimerItemFactory.class)
+public class WifiCallingDisclaimerFragmentTest {
+
+    @Mock
+    private Activity mActivity;
+    @Mock
+    private DisclaimerItem mDisclaimerItem;
+    @Mock
+    private LayoutInflater mLayoutInflater;
+    @Mock
+    private View mView;
+    @Mock
+    private ViewGroup mViewGroup;
+    @Mock
+    private Button mAgreeButton;
+    @Mock
+    private Button mDisagreeButton;
+    @Mock
+    private RecyclerView mRecyclerView;
+
+    @Captor
+    ArgumentCaptor<OnClickListener> mOnClickListenerCaptor;
+    @Captor
+    ArgumentCaptor<OnScrollListener> mOnScrollListenerCaptor;
+
+    private WifiCallingDisclaimerFragment mFragment;
+    private List<DisclaimerItem> mDisclaimerItemList = new ArrayList<>();
+    private List<DisclaimerItem> mEmptyDisclaimerItemList = new ArrayList<>();
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mActivity = Robolectric.setupActivity(Activity.class);
+        mFragment = spy(new WifiCallingDisclaimerFragment());
+
+        doReturn(mActivity).when(mFragment).getActivity();
+
+        when(mLayoutInflater.inflate(anyInt(), anyObject(), anyBoolean())).thenReturn(mView);
+        when(mView.findViewById(R.id.agree_button)).thenReturn(mAgreeButton);
+        when(mView.findViewById(R.id.disagree_button)).thenReturn(mDisagreeButton);
+        when(mView.findViewById(R.id.disclaimer_item_list)).thenReturn(mRecyclerView);
+        when(mView.getId()).thenReturn(R.id.agree_button);
+
+        mOnScrollListenerCaptor = ArgumentCaptor.forClass(OnScrollListener.class);
+        doNothing().when(mRecyclerView).addOnScrollListener(mOnScrollListenerCaptor.capture());
+        mOnClickListenerCaptor = ArgumentCaptor.forClass(OnClickListener.class);
+        doNothing().when(mAgreeButton).setOnClickListener(mOnClickListenerCaptor.capture());
+
+        mDisclaimerItemList.add(mDisclaimerItem);
+    }
+
+    @Test
+    public void onCreate_notHaveItem_shouldFinishFragment() {
+        ShadowDisclaimerItemFactory.setDisclaimerItemList(mEmptyDisclaimerItemList);
+
+        mFragment.onCreate(null /* savedInstanceState */);
+
+        // Check the fragment is finished when the DisclaimerItemList is empty.
+        verify(mFragment).finish(Activity.RESULT_OK);
+    }
+
+    @Test
+    public void onCreate_haveItem_shouldNotFinishFragment() {
+        ShadowDisclaimerItemFactory.setDisclaimerItemList(mDisclaimerItemList);
+
+        mFragment.onCreate(null /* savedInstanceState */);
+
+        // Check the fragment is not finished when the DisclaimerItemList is not empty.
+        verify(mFragment, never()).finish(Activity.RESULT_OK);
+    }
+
+    @Test
+    public void onScrolled_canNotScroll_shouldEnableAgreeButton() {
+        ShadowDisclaimerItemFactory.setDisclaimerItemList(mDisclaimerItemList);
+
+        when(mRecyclerView.canScrollVertically(1)).thenReturn(false);
+
+        mFragment.onCreate(null /* savedInstanceState */);
+        mFragment.onCreateView(mLayoutInflater, mViewGroup, null /* savedInstanceState */);
+
+        mOnScrollListenerCaptor.getValue().onScrolled(mRecyclerView, 0, 0);
+
+        // Check the agreeButton is enabled when the view is scrolled to the bottom end.
+        verify(mAgreeButton).setEnabled(true);
+        // Check the OnScrollListener is removed when the view is scrolled to the bottom end.
+        verify(mRecyclerView).removeOnScrollListener(any());
+    }
+
+    @Test
+    public void onScrolled_canScroll_shouldNotEnableAgreeButton() {
+        ShadowDisclaimerItemFactory.setDisclaimerItemList(mDisclaimerItemList);
+
+        when(mRecyclerView.canScrollVertically(1)).thenReturn(true);
+
+        mFragment.onCreate(null /* savedInstanceState */);
+        mFragment.onCreateView(mLayoutInflater, mViewGroup, null /* savedInstanceState */);
+
+        mOnScrollListenerCaptor.getValue().onScrolled(mRecyclerView, 0, 0);
+
+        // Check the agreeButton is not enabled when the view is not scrolled to the bottom end.
+        verify(mAgreeButton, never()).setEnabled(anyBoolean());
+        // Check the OnScrollListener is not removed when the view is not scrolled to
+        // the bottom end.
+        verify(mRecyclerView, never()).removeOnScrollListener(any());
+    }
+
+    @Test
+    public void onClick_agreeButton_shouldFinishFragment() {
+        ShadowDisclaimerItemFactory.setDisclaimerItemList(mDisclaimerItemList);
+
+        mFragment.onCreate(null /* savedInstanceState */);
+        mFragment.onCreateView(mLayoutInflater, mViewGroup, null /* savedInstanceState */);
+
+        mOnClickListenerCaptor.getValue().onClick(mAgreeButton);
+
+        // Check the onAgreed callback is called when "CONTINUE" button is clicked.
+        verify(mDisclaimerItem).onAgreed();
+        // Check the WFC disclaimer fragment is finished when "CONTINUE" button is clicked.
+        verify(mFragment).finish(Activity.RESULT_OK);
+    }
+}

tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java

@@ -16,11 +16,14 @@
 
 package com.android.settings.wifi.calling;
 
+import static com.android.settings.SettingsActivity.EXTRA_SHOW_FRAGMENT;
 import static com.google.common.truth.Truth.assertThat;
 
+import static junit.framework.Assert.assertEquals;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyBoolean;
 import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.eq;
@@ -31,6 +34,8 @@ 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.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
@@ -41,18 +46,22 @@ import android.telephony.ims.ProvisioningManager;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 
 import com.android.ims.ImsConfig;
 import com.android.ims.ImsManager;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
+import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.shadow.SettingsShadowResources;
 import com.android.settings.widget.SwitchBar;
 import com.android.settings.widget.ToggleSwitch;
 
 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.RobolectricTestRunner;
@@ -63,6 +72,8 @@ import org.robolectric.util.ReflectionHelpers;
 public class WifiCallingSettingsForSubTest {
     private static final String BUTTON_WFC_MODE = "wifi_calling_mode";
     private static final String BUTTON_WFC_ROAMING_MODE = "wifi_calling_roaming_mode";
+    private static final String TEST_EMERGENCY_ADDRESS_CARRIER_APP =
+            "com.android.settings/.wifi.calling.TestEmergencyAddressCarrierApp";
 
     private TestFragment mFragment;
     private Context mContext;
@@ -70,6 +81,7 @@ public class WifiCallingSettingsForSubTest {
     private final PersistableBundle mBundle = new PersistableBundle();
 
     @Mock private static CarrierConfigManager sCarrierConfigManager;
+    @Mock private CarrierConfigManager mMockConfigManager;
     @Mock private ImsManager mImsManager;
     @Mock private TelephonyManager mTelephonyManager;
     @Mock private PreferenceScreen mPreferenceScreen;
@@ -80,6 +92,7 @@ public class WifiCallingSettingsForSubTest {
     @Mock private ImsConfig mImsConfig;
     @Mock private ListWithEntrySummaryPreference mButtonWfcMode;
     @Mock private ListWithEntrySummaryPreference mButtonWfcRoamingMode;
+    @Mock private Preference mUpdateAddress;
 
     @Before
     public void setUp() throws Exception {
@@ -121,6 +134,11 @@ public class WifiCallingSettingsForSubTest {
         doReturn(mBundle).when(sCarrierConfigManager).getConfigForSubId(anyInt());
         setDefaultCarrierConfigValues();
 
+        doReturn(sCarrierConfigManager).when(mActivity).getSystemService(
+                CarrierConfigManager.class);
+        doReturn(mContext.getResources()).when(mFragment).getResourcesForSubId();
+        doNothing().when(mFragment).startActivityForResult(any(Intent.class), anyInt());
+
         mFragment.onAttach(mContext);
         mFragment.onCreate(null);
         mFragment.onActivityCreated(null);
@@ -131,6 +149,9 @@ public class WifiCallingSettingsForSubTest {
                 CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, false);
         mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_MODE_BOOL, true);
         mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, true);
+        mBundle.putString(
+                CarrierConfigManager.KEY_WFC_EMERGENCY_ADDRESS_CARRIER_APP_STRING,
+                TEST_EMERGENCY_ADDRESS_CARRIER_APP);
     }
 
     @Test
@@ -259,6 +280,61 @@ public class WifiCallingSettingsForSubTest {
                 eq(true));
     }
 
+    @Test
+    public void onSwitchChanged_enableSetting_shouldLaunchWfcDisclaimerFragment() {
+        ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+
+        mFragment.onSwitchChanged(null, true);
+
+        // Check the WFC disclaimer fragment is launched.
+        verify(mFragment).startActivityForResult(intentCaptor.capture(),
+                eq(WifiCallingSettingsForSub.REQUEST_CHECK_WFC_DISCLAIMER));
+        Intent intent = intentCaptor.getValue();
+        assertThat(intent.getStringExtra(EXTRA_SHOW_FRAGMENT))
+                .isEqualTo(WifiCallingDisclaimerFragment.class.getName());
+    }
+
+    @Test
+    public void onActivityResult_finishWfcDisclaimerFragment_shouldLaunchCarrierActivity() {
+        ArgumentCaptor<Intent> intentCaptor = ArgumentCaptor.forClass(Intent.class);
+
+        // Emulate the WfcDisclaimerActivity finish.
+        mFragment.onActivityResult(WifiCallingSettingsForSub.REQUEST_CHECK_WFC_DISCLAIMER,
+                Activity.RESULT_OK, null);
+
+        // Check the WFC emergency address activity is launched.
+        verify(mFragment).startActivityForResult(intentCaptor.capture(),
+                eq(WifiCallingSettingsForSub.REQUEST_CHECK_WFC_EMERGENCY_ADDRESS));
+        Intent intent = intentCaptor.getValue();
+        assertEquals(intent.getComponent(), ComponentName.unflattenFromString(
+                TEST_EMERGENCY_ADDRESS_CARRIER_APP));
+    }
+
+    @Test
+    public void onActivityResult_finishCarrierActivity_shouldShowWfcPreference() {
+        ReflectionHelpers.setField(mFragment, "mButtonWfcMode", mButtonWfcMode);
+        ReflectionHelpers.setField(mFragment, "mButtonWfcRoamingMode", mButtonWfcRoamingMode);
+        ReflectionHelpers.setField(mFragment, "mUpdateAddress", mUpdateAddress);
+
+        mFragment.onActivityResult(WifiCallingSettingsForSub.REQUEST_CHECK_WFC_EMERGENCY_ADDRESS,
+                Activity.RESULT_OK, null);
+
+        // Check the WFC preferences is added.
+        verify(mPreferenceScreen).addPreference(mButtonWfcMode);
+        verify(mPreferenceScreen).addPreference(mButtonWfcRoamingMode);
+        verify(mPreferenceScreen).addPreference(mUpdateAddress);
+        // Check the WFC enable request.
+        verify(mImsManager).setWfcSetting(true);
+    }
+
+    @Test
+    public void onSwitchChanged_disableSetting_shouldNotLaunchWfcDisclaimerFragment() {
+        mFragment.onSwitchChanged(null, false);
+
+        // Check the WFC disclaimer fragment is not launched.
+        verify(mFragment, never()).startActivityForResult(any(Intent.class), anyInt());
+    }
+
     protected class TestFragment extends WifiCallingSettingsForSub {
         @Override
         protected Object getSystemService(final String name) {