[Provider Model] Carrie Wi-Fi offload toggle request

- Remove the Advanced expandable list pattern and expose the items

- Add Carrie Wi-Fi offload toggle preference

- Add Carrier Wi-Fi network preference

- Do not set Carrier Network together when setting Mobile Data, if
carrner network provision enabled.

- Screenshot:
  https://screenshot.googleplex.com/8vMow53cvGfUAoj

Bug: 182324921
Test: manual test
atest -c CarrierWifiTogglePreferenceControllerTest \
         MobileDataPreferenceControllerTest \
	 WifiPickerTrackerHelperTest

Change-Id: I5a7f4cc6850fe76c0efee392c0c0c23cb41f5e1e

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

@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2021 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 androidx.lifecycle.Lifecycle;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.Utils;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settings.wifi.WifiPickerTrackerHelper;
+import com.android.wifitrackerlib.WifiPickerTracker;
+
+/**
+ * Preference controller for "Carrier Wi-Fi network"
+ */
+public class CarrierWifiTogglePreferenceController extends TogglePreferenceController implements
+        WifiPickerTracker.WifiPickerTrackerCallback {
+
+    private static final String TAG = "CarrierWifiTogglePreferenceController";
+    protected static final String CARRIER_WIFI_TOGGLE_PREF_KEY = "carrier_wifi_toggle";
+    protected static final String CARRIER_WIFI_NETWORK_PREF_KEY = "carrier_wifi_network";
+
+    protected final Context mContext;
+    protected boolean mIsProviderModelEnabled;
+    protected int mSubId;
+    protected WifiPickerTrackerHelper mWifiPickerTrackerHelper;
+    protected boolean mIsCarrierProvisionWifiEnabled;
+    protected Preference mCarrierNetworkPreference;
+
+    public CarrierWifiTogglePreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+        mContext = context;
+        mIsProviderModelEnabled = Utils.isProviderModelEnabled(context);
+    }
+
+    /** Initialize related properties */
+    public void init(Lifecycle lifecycle, int subId) {
+        mSubId = subId;
+        mWifiPickerTrackerHelper = new WifiPickerTrackerHelper(lifecycle, mContext, this);
+        mIsCarrierProvisionWifiEnabled =
+                mWifiPickerTrackerHelper.isCarrierNetworkProvisionEnabled(mSubId);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (!mIsProviderModelEnabled) {
+            return CONDITIONALLY_UNAVAILABLE;
+        }
+        return mIsCarrierProvisionWifiEnabled ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mWifiPickerTrackerHelper.isCarrierNetworkEnabled(mSubId);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        if (mWifiPickerTrackerHelper == null) {
+            return false;
+        }
+        mWifiPickerTrackerHelper.setCarrierNetworkEnabled(isChecked);
+        updateCarrierNetworkPreference(isChecked);
+        return true;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mCarrierNetworkPreference = screen.findPreference(CARRIER_WIFI_NETWORK_PREF_KEY);
+        updateCarrierNetworkPreference(isChecked());
+    }
+
+    @Override
+    public void onWifiStateChanged() {
+        if (mCarrierNetworkPreference != null && mCarrierNetworkPreference.isVisible()) {
+            mCarrierNetworkPreference.setSummary(getCarrierNetworkSsid());
+        }
+    }
+
+    @Override
+    public void onWifiEntriesChanged() {
+        if (mCarrierNetworkPreference != null && mCarrierNetworkPreference.isVisible()) {
+            mCarrierNetworkPreference.setSummary(getCarrierNetworkSsid());
+        }
+    }
+
+    @Override
+    public void onNumSavedNetworksChanged() {
+        // Do nothing
+    }
+
+    @Override
+    public void onNumSavedSubscriptionsChanged() {
+        // Do nothing
+    }
+
+    protected void updateCarrierNetworkPreference(boolean isCarrierNetworkEnabled) {
+        if (mCarrierNetworkPreference == null) {
+            return;
+        }
+        if (!isCarrierNetworkEnabled || getAvailabilityStatus() != AVAILABLE) {
+            mCarrierNetworkPreference.setVisible(false);
+            return;
+        }
+        mCarrierNetworkPreference.setVisible(true);
+        mCarrierNetworkPreference.setSummary(getCarrierNetworkSsid());
+    }
+
+    protected String getCarrierNetworkSsid() {
+        if (mWifiPickerTrackerHelper == null) {
+            return null;
+        }
+        return mWifiPickerTrackerHelper.getCarrierNetworkSsid();
+    }
+}