| /* |
| * Copyright (C) 2017 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.car.settings.wifi.details; |
| |
| import android.car.drivingstate.CarUxRestrictions; |
| import android.content.Context; |
| import android.net.LinkAddress; |
| import android.net.NetworkUtils; |
| |
| import com.android.car.settings.common.FragmentController; |
| |
| import java.net.Inet4Address; |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| |
| /** |
| * Shows info about Wifi subnet. |
| */ |
| public class WifiSubnetPreferenceController extends |
| WifiDetailsBasePreferenceController<WifiDetailsPreference> { |
| |
| public WifiSubnetPreferenceController(Context context, String preferenceKey, |
| FragmentController fragmentController, CarUxRestrictions uxRestrictions) { |
| super(context, preferenceKey, fragmentController, uxRestrictions); |
| } |
| |
| @Override |
| protected Class<WifiDetailsPreference> getPreferenceType() { |
| return WifiDetailsPreference.class; |
| } |
| |
| @Override |
| protected void updateState(WifiDetailsPreference preference) { |
| String subnet = null; |
| |
| for (LinkAddress addr : getWifiInfoProvider().getLinkProperties().getLinkAddresses()) { |
| if (addr.getAddress() instanceof Inet4Address) { |
| subnet = ipv4PrefixLengthToSubnetMask(addr.getPrefixLength()); |
| } |
| } |
| |
| if (subnet == null) { |
| preference.setVisible(false); |
| } else { |
| preference.setDetailText(subnet); |
| preference.setVisible(true); |
| } |
| } |
| |
| private static String ipv4PrefixLengthToSubnetMask(int prefixLength) { |
| try { |
| InetAddress all = InetAddress.getByAddress( |
| new byte[]{(byte) 255, (byte) 255, (byte) 255, (byte) 255}); |
| return NetworkUtils.getNetworkPart(all, prefixLength).getHostAddress(); |
| } catch (UnknownHostException e) { |
| return null; |
| } |
| } |
| } |