Add wifi metered controls in wifi settings.

1. Add it in wifi detail page
2. Add it in wifi dialog
2. Remove it in "Mobile network" page

Bug: 68030417
Test: RunSettingsRoboTests
Change-Id: I2e001c55f3c6c75a660e429732dfbece97b0ca9e

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

@@ -146,11 +146,11 @@ public class WifiConfigController implements TextWatcher,
     private TextView mDns2View;
 
     private Spinner mProxySettingsSpinner;
+    private Spinner mMeteredSettingsSpinner;
     private TextView mProxyHostView;
     private TextView mProxyPortView;
     private TextView mProxyExclusionListView;
     private TextView mProxyPacView;
-
     private CheckBox mSharedCheckBox;
 
     private IpAssignment mIpAssignment = IpAssignment.UNASSIGNED;
@@ -208,6 +208,7 @@ public class WifiConfigController implements TextWatcher,
         mProxySettingsSpinner = (Spinner) mView.findViewById(R.id.proxy_settings);
         mProxySettingsSpinner.setOnItemSelectedListener(this);
         mSharedCheckBox = (CheckBox) mView.findViewById(R.id.shared);
+        mMeteredSettingsSpinner = mView.findViewById(R.id.metered_settings);
 
         if (mAccessPoint == null) { // new network
             mConfigUi.setTitle(R.string.wifi_add_network);
@@ -237,6 +238,7 @@ public class WifiConfigController implements TextWatcher,
             boolean showAdvancedFields = false;
             if (mAccessPoint.isSaved()) {
                 WifiConfiguration config = mAccessPoint.getConfig();
+                mMeteredSettingsSpinner.setSelection(config.meteredOverride);
                 if (config.getIpAssignment() == IpAssignment.STATIC) {
                     mIpSettingsSpinner.setSelection(STATIC_IP);
                     showAdvancedFields = true;
@@ -671,6 +673,9 @@ public class WifiConfigController implements TextWatcher,
         config.setIpConfiguration(
                 new IpConfiguration(mIpAssignment, mProxySettings,
                                     mStaticIpConfiguration, mHttpProxy));
+        if (mMeteredSettingsSpinner != null) {
+            config.meteredOverride = mMeteredSettingsSpinner.getSelectedItemPosition();
+        }
 
         return config;
     }

src/com/android/settings/wifi/details/WifiMeteredPreferenceController.java

@@ -0,0 +1,83 @@
+/*
+ * 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.details;
+
+import android.app.backup.BackupManager;
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.provider.Settings;
+import android.support.annotation.VisibleForTesting;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.DropDownPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+/**
+ * {@link AbstractPreferenceController} that controls whether the wifi network is metered or not
+ */
+public class WifiMeteredPreferenceController extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener {
+
+    private static final String KEY_WIFI_METERED = "metered";
+    private WifiConfiguration mWifiConfiguration;
+    private WifiManager mWifiManager;
+
+    public WifiMeteredPreferenceController(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) {
+        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() {
+        // Wrap the meteredOverride since robolectric cannot recognize it
+        return mWifiConfiguration.meteredOverride;
+    }
+
+    private void updateSummary(DropDownPreference preference, int meteredOverride) {
+        preference.setSummary(preference.getEntries()[meteredOverride]);
+    }
+}

src/com/android/settings/wifi/details/WifiNetworkDetailsFragment.java

@@ -20,10 +20,13 @@ import static com.android.settings.wifi.WifiSettings.WIFI_DIALOG_ID;
 import android.app.Dialog;
 import android.content.Context;
 import android.net.ConnectivityManager;
+import android.net.NetworkPolicyManager;
+import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
+import android.support.v7.preference.DropDownPreference;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -122,6 +125,7 @@ public class WifiNetworkDetailsFragment extends DashboardFragment {
 
     @Override
     protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
         ConnectivityManager cm = context.getSystemService(ConnectivityManager.class);
         mWifiDetailPreferenceController = WifiDetailPreferenceController.newInstance(
                 mAccessPoint,
@@ -133,6 +137,9 @@ public class WifiNetworkDetailsFragment extends DashboardFragment {
                 context.getSystemService(WifiManager.class),
                 mMetricsFeatureProvider);
 
-        return new ArrayList<>(Collections.singletonList(mWifiDetailPreferenceController));
+        controllers.add(mWifiDetailPreferenceController);
+        controllers.add(new WifiMeteredPreferenceController(context, mAccessPoint.getConfig()));
+
+        return controllers;
     }
 }