[Wi-Fi] Add STA+AP information in Hotspot & tethering footer

Use WifiManager#isStaApConcurrencySupported() to check if a
device supports STA+AP and shows the footer information.

Bug: 121328949
Test: make RunSettingsRoboTests ROBOTEST_FILTER=TetherSettingsTest
      make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherFooterPreferenceControllerTest
Change-Id: I3446abb5cc9cdf76da8d17f5de31bd65715c165c

src/com/android/settings/AllInOneTetherSettings.java

@@ -56,6 +56,7 @@ import com.android.settings.widget.SwitchBarController;
 import com.android.settings.wifi.tether.WifiTetherApBandPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherAutoOffPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherBasePreferenceController;
+import com.android.settings.wifi.tether.WifiTetherFooterPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherPasswordPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherSSIDPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherSecurityPreferenceController;
@@ -71,7 +72,7 @@ import java.util.concurrent.atomic.AtomicReference;
  * Displays preferences for all Tethering options.
  */
 @SearchIndexable
-public final class AllInOneTetherSettings extends RestrictedDashboardFragment
+public class AllInOneTetherSettings extends RestrictedDashboardFragment
         implements DataSaverBackend.Listener,
         WifiTetherBasePreferenceController.OnTetherConfigUpdateListener,
         SharedPreferences.OnSharedPreferenceChangeListener {
@@ -304,6 +305,8 @@ public final class AllInOneTetherSettings extends RestrictedDashboardFragment
                 new WifiTetherSecurityPreferenceController(context, listener));
         controllers.add(
                 new WifiTetherAutoOffPreferenceController(context, KEY_WIFI_TETHER_AUTO_OFF));
+        controllers.add(
+                new WifiTetherFooterPreferenceController(context));
 
         return controllers;
     }

src/com/android/settings/TetherSettings.java

@@ -31,6 +31,7 @@ import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.hardware.usb.UsbManager;
 import android.net.ConnectivityManager;
+import android.net.wifi.WifiManager;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.Handler;
@@ -71,6 +72,8 @@ public class TetherSettings extends RestrictedSettingsFragment
     @VisibleForTesting
     static final String KEY_ENABLE_BLUETOOTH_TETHERING = "enable_bluetooth_tethering";
     private static final String KEY_DATA_SAVER_FOOTER = "disabled_on_data_saver";
+    @VisibleForTesting
+    static final String KEY_TETHER_PREFS_FOOTER = "tether_prefs_footer";
 
     private static final String TAG = "TetheringSettings";
 
@@ -141,6 +144,7 @@ public class TetherSettings extends RestrictedSettingsFragment
 
         mUsbTether = (SwitchPreference) findPreference(KEY_USB_TETHER_SETTINGS);
         mBluetoothTether = (SwitchPreference) findPreference(KEY_ENABLE_BLUETOOTH_TETHERING);
+        setFooterPreferenceTitle();
 
         mDataSaverBackend.addListener(this);
 
@@ -201,6 +205,18 @@ public class TetherSettings extends RestrictedSettingsFragment
     public void onBlacklistStatusChanged(int uid, boolean isBlacklisted)  {
     }
 
+    @VisibleForTesting
+    void setFooterPreferenceTitle() {
+        final Preference footerPreference = findPreference(KEY_TETHER_PREFS_FOOTER);
+        final WifiManager wifiManager =
+                (WifiManager) getContext().getSystemService(Context.WIFI_SERVICE);
+        if (wifiManager.isStaApConcurrencySupported()) {
+            footerPreference.setTitle(R.string.tethering_footer_info_sta_ap_concurrency);
+        } else {
+            footerPreference.setTitle(R.string.tethering_footer_info);
+        }
+    }
+
     private class TetherChangeReceiver extends BroadcastReceiver {
         @Override
         public void onReceive(Context content, Intent intent) {

src/com/android/settings/wifi/WifiConnectionPreferenceController.java

@@ -34,6 +34,7 @@ import com.android.settingslib.wifi.AccessPointPreference;
 import com.android.settingslib.wifi.WifiTracker;
 import com.android.settingslib.wifi.WifiTrackerFactory;
 
+// TODO(b/151133650): Replace AbstractPreferenceController with BasePreferenceController.
 /**
  * This places a preference into a PreferenceGroup owned by some parent
  * controller class when there is a wifi connection present.

src/com/android/settings/wifi/WifiMasterSwitchPreferenceController.java

@@ -32,6 +32,7 @@ import com.android.settingslib.core.lifecycle.events.OnResume;
 import com.android.settingslib.core.lifecycle.events.OnStart;
 import com.android.settingslib.core.lifecycle.events.OnStop;
 
+// TODO(b/151133650): Replace AbstractPreferenceController with BasePreferenceController.
 public class WifiMasterSwitchPreferenceController extends AbstractPreferenceController
         implements PreferenceControllerMixin, SummaryUpdater.OnSummaryChangeListener,
         LifecycleObserver, OnResume, OnPause, OnStart, OnStop {

src/com/android/settings/wifi/details2/WifiDetailPreferenceController2.java

@@ -101,6 +101,7 @@ import java.time.format.FormatStyle;
 import java.util.StringJoiner;
 import java.util.stream.Collectors;
 
+// TODO(b/151133650): Replace AbstractPreferenceController with BasePreferenceController.
 /**
  * Controller for logic pertaining to displaying Wifi information for the
  * {@link WifiNetworkDetailsFragment}.

src/com/android/settings/wifi/tether/WifiTetherBasePreferenceController.java

@@ -26,6 +26,7 @@ import androidx.preference.PreferenceScreen;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.core.AbstractPreferenceController;
 
+// TODO(b/151133650): Replace AbstractPreferenceController with BasePreferenceController.
 public abstract class WifiTetherBasePreferenceController extends AbstractPreferenceController
         implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener {
 

src/com/android/settings/wifi/tether/WifiTetherFooterPreferenceController.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2020 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.tether;
+
+import android.content.Context;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+
+/**
+ * Shows hotspot footer information.
+ */
+public class WifiTetherFooterPreferenceController extends WifiTetherBasePreferenceController {
+
+    private static final String PREF_KEY = "tether_prefs_footer_2";
+
+    public WifiTetherFooterPreferenceController(Context context) {
+        super(context, null /* listener */);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY;
+    }
+
+    @Override
+    public void updateDisplay() {
+        if (mWifiManager.isStaApConcurrencySupported()) {
+            mPreference.setTitle(R.string.tethering_footer_info_sta_ap_concurrency);
+        } else {
+            mPreference.setTitle(R.string.tethering_footer_info);
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        return true;
+    }
+}