[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/details2/WifiMeteredPreferenceController2.java

@@ -0,0 +1,108 @@
+/*
+ * 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.details2;
+
+import android.app.backup.BackupManager;
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.DropDownPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.wifi.WifiDialog;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+/**
+ * {@link AbstractPreferenceController} that controls whether the wifi network is metered or not
+ */
+public class WifiMeteredPreferenceController2 extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener, WifiDialog.WifiDialogListener {
+
+    private static final String KEY_WIFI_METERED = "metered";
+    private WifiConfiguration mWifiConfiguration;
+    private WifiManager mWifiManager;
+    private Preference mPreference;
+
+    public WifiMeteredPreferenceController2(Context context, WifiConfiguration wifiConfiguration) {
+        super(context, KEY_WIFI_METERED);
+        mWifiConfiguration = wifiConfiguration;
+        mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final DropDownPreference dropDownPreference = (DropDownPreference) preference;
+        final int meteredOverride = getMeteredOverride();
+        dropDownPreference.setValue(Integer.toString(meteredOverride));
+        updateSummary(dropDownPreference, meteredOverride);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (mWifiConfiguration != null) {
+            mWifiConfiguration.meteredOverride = Integer.parseInt((String) newValue);
+        }
+        mWifiManager.updateNetwork(mWifiConfiguration);
+        // Stage the backup of the SettingsProvider package which backs this up
+        BackupManager.dataChanged("com.android.providers.settings");
+        updateSummary((DropDownPreference) preference, getMeteredOverride());
+        return true;
+    }
+
+    @VisibleForTesting
+    int getMeteredOverride() {
+        if (mWifiConfiguration != null) {
+            // Wrap the meteredOverride since robolectric cannot recognize it
+            return mWifiConfiguration.meteredOverride;
+        }
+        return WifiConfiguration.METERED_OVERRIDE_NONE;
+    }
+
+    private void updateSummary(DropDownPreference preference, int meteredOverride) {
+        preference.setSummary(preference.getEntries()[meteredOverride]);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void onSubmit(WifiDialog dialog) {
+        if (dialog.getController() != null) {
+            final WifiConfiguration newConfig = dialog.getController().getConfig();
+            if (newConfig == null || mWifiConfiguration == null) {
+                return;
+            }
+
+            if (newConfig.meteredOverride != mWifiConfiguration.meteredOverride) {
+                mWifiConfiguration = newConfig;
+                onPreferenceChange(mPreference, String.valueOf(newConfig.meteredOverride));
+            }
+        }
+    }
+}