[Wi-Fi] Create WifiNetworkDetailsFragment related version 2 files for WifiTracker2 development

Create below version 2 files for WifiTracker2 development, we can
check the feature flag only a few times and easily remove version 1
files in the future.

    src/com/android/settings/wifi/details2/
    src/com/android/settings/wifi/savedaccesspoints2/
    tests/robotests/src/com/android/settings/wifi/details2/
    tests/robotests/src/com/android/settings/wifi/savedaccesspoints2/

Bug: 143326832
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.wifi.details2
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.wifi.savedaccesspoints2

Change-Id: I4d2caf1ce313871605252395764b02747240f217

src/com/android/settings/wifi/savedaccesspoints2/SavedAccessPointsPreferenceController2.java

@@ -0,0 +1,107 @@
+/*
+ * 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.wifi.savedaccesspoints2;
+
+import android.content.Context;
+import android.net.wifi.WifiManager;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.wifi.AccessPoint;
+import com.android.settingslib.wifi.AccessPointPreference;
+import com.android.settingslib.wifi.AccessPointPreference.UserBadgeCache;
+import com.android.settingslib.wifi.WifiSavedConfigUtils;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Controller that manages a PreferenceGroup, which contains a list of saved access points.
+ */
+public class SavedAccessPointsPreferenceController2 extends BasePreferenceController implements
+        Preference.OnPreferenceClickListener {
+
+    protected final WifiManager mWifiManager;
+    private final UserBadgeCache mUserBadgeCache;
+    private PreferenceGroup mPreferenceGroup;
+    private SavedAccessPointsWifiSettings2 mHost;
+    @VisibleForTesting
+    List<AccessPoint> mAccessPoints;
+
+    public SavedAccessPointsPreferenceController2(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mUserBadgeCache = new AccessPointPreference.UserBadgeCache(context.getPackageManager());
+        mWifiManager = context.getSystemService(WifiManager.class);
+    }
+
+    /**
+     * Set {@link SavedAccessPointsWifiSettings2} for click callback action.
+     */
+    public SavedAccessPointsPreferenceController2 setHost(SavedAccessPointsWifiSettings2 host) {
+        mHost = host;
+        return this;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mAccessPoints.size() > 0 ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        mPreferenceGroup = screen.findPreference(getPreferenceKey());
+        refreshSavedAccessPoints();
+        updatePreference();
+        super.displayPreference(screen);
+    }
+
+    @Override
+    public boolean onPreferenceClick(Preference preference) {
+        if (mHost != null) {
+            final Preference preferenceInGroup =
+                    mPreferenceGroup.findPreference(preference.getKey());
+            mHost.showWifiPage((AccessPointPreference) preferenceInGroup);
+        }
+        return false;
+    }
+
+    protected void refreshSavedAccessPoints() {
+        mAccessPoints = WifiSavedConfigUtils.getAllConfigs(mContext, mWifiManager).stream()
+                .filter(accessPoint -> !accessPoint.isPasspointConfig())
+                .sorted(SavedNetworkComparator2.INSTANCE)
+                .collect(Collectors.toList());
+    }
+
+    private void updatePreference() {
+        mPreferenceGroup.removeAll();
+        for (AccessPoint accessPoint : mAccessPoints) {
+            final String key = accessPoint.getKey();
+
+            final AccessPointPreference preference = new AccessPointPreference(accessPoint,
+                    mContext, mUserBadgeCache, true /* forSavedNetworks */);
+            preference.setKey(key);
+            preference.setIcon(null);
+            preference.setOnPreferenceClickListener(this);
+
+            mPreferenceGroup.addPreference(preference);
+        }
+    }
+}