Add preference for WiFi MAC randomization.

Preference visibility contolled by feature flag -
settings_wifi_mac_randomization.

Bug: 1227787
Test: RunSettingsRoboTests

Change-Id: Ibad8d3ea2bfa3879acc1ec883b8c03f1979bde45

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

@@ -0,0 +1,89 @@
+/*
+ * 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.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.util.FeatureFlagUtils;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.DropDownPreference;
+import androidx.preference.Preference;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.FeatureFlags;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+/**
+ * {@link AbstractPreferenceController} that controls whether the wifi network is mac randomized
+ * or not
+ */
+public class WifiPrivacyPreferenceController extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener {
+
+    private static final String KEY_WIFI_PRIVACY = "privacy";
+    private WifiConfiguration mWifiConfiguration;
+    private WifiManager mWifiManager;
+
+    public WifiPrivacyPreferenceController(Context context) {
+        super(context, KEY_WIFI_PRIVACY);
+        mWifiConfiguration = null;
+        mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+    }
+
+    public void setWifiConfiguration(WifiConfiguration wifiConfiguration) {
+        mWifiConfiguration = wifiConfiguration;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return FeatureFlagUtils.isEnabled(mContext, FeatureFlags.WIFI_MAC_RANDOMIZATION)
+                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final DropDownPreference dropDownPreference = (DropDownPreference) preference;
+        final int randomizationLevel = getRandomizationValue();
+        dropDownPreference.setValue(Integer.toString(randomizationLevel));
+        updateSummary((DropDownPreference) preference, randomizationLevel);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (mWifiConfiguration != null) {
+            //TODO(b/117957974): update MAC randomization level to WifiManager
+            mWifiManager.updateNetwork(mWifiConfiguration);
+        }
+        updateSummary((DropDownPreference) preference, Integer.parseInt((String) newValue));
+        return true;
+    }
+
+    @VisibleForTesting
+    int getRandomizationValue() {
+        if (mWifiConfiguration != null) {
+            //TODO(b/117957974): get real MAC randomization level from WifiManager
+            return 0;
+        }
+        return 0;
+    }
+
+    private void updateSummary(DropDownPreference preference, int macRandomized) {
+        preference.setSummary(preference.getEntries()[macRandomized]);
+    }
+}