src/com/android/settings/wifi/details/WifiDetailPreferenceController.java - platform/packages/apps/Settings - Git at Google

 /*
  * 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.settings.wifi.details;

 import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
 import static android.net.NetworkCapabilities.TRANSPORT_WIFI;

 import android.app.Activity;
 import android.app.Fragment;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.graphics.drawable.Drawable;
 import android.net.ConnectivityManager;
 import android.net.ConnectivityManager.NetworkCallback;
 import android.net.LinkAddress;
 import android.net.LinkProperties;
 import android.net.Network;
 import android.net.NetworkCapabilities;
 import android.net.NetworkInfo;
 import android.net.NetworkRequest;
 import android.net.NetworkUtils;
 import android.net.RouteInfo;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Handler;
 import androidx.core.text.BidiFormatter;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceScreen;
 import android.text.TextUtils;
 import android.util.Log;
 import android.widget.ImageView;
 import android.widget.Toast;

 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.applications.LayoutPreference;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.widget.ActionButtonPreference;
 import com.android.settings.widget.EntityHeaderController;
 import com.android.settings.wifi.WifiDetailPreference;
 import com.android.settings.wifi.WifiDialog;
 import com.android.settings.wifi.WifiDialog.WifiDialogListener;
 import com.android.settings.wifi.WifiUtils;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
 import com.android.settingslib.core.lifecycle.events.OnResume;
 import com.android.settingslib.wifi.AccessPoint;

 import java.net.Inet4Address;
 import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.util.StringJoiner;
 import java.util.stream.Collectors;

 /**
  * Controller for logic pertaining to displaying Wifi information for the
  * {@link WifiNetworkDetailsFragment}.
  */
 public class WifiDetailPreferenceController extends AbstractPreferenceController
         implements PreferenceControllerMixin, WifiDialogListener, LifecycleObserver, OnPause,
         OnResume {

     private static final String TAG = "WifiDetailsPrefCtrl";
     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);

     @VisibleForTesting
     static final String KEY_HEADER = "connection_header";
     @VisibleForTesting
     static final String KEY_BUTTONS_PREF = "buttons";
     @VisibleForTesting
     static final String KEY_SIGNAL_STRENGTH_PREF = "signal_strength";
     @VisibleForTesting
     static final String KEY_LINK_SPEED = "link_speed";
     @VisibleForTesting
     static final String KEY_FREQUENCY_PREF = "frequency";
     @VisibleForTesting
     static final String KEY_SECURITY_PREF = "security";
     @VisibleForTesting
     static final String KEY_MAC_ADDRESS_PREF = "mac_address";
     @VisibleForTesting
     static final String KEY_IP_ADDRESS_PREF = "ip_address";
     @VisibleForTesting
     static final String KEY_GATEWAY_PREF = "gateway";
     @VisibleForTesting
     static final String KEY_SUBNET_MASK_PREF = "subnet_mask";
     @VisibleForTesting
     static final String KEY_DNS_PREF = "dns";
     @VisibleForTesting
     static final String KEY_IPV6_CATEGORY = "ipv6_category";
     @VisibleForTesting
     static final String KEY_IPV6_ADDRESSES_PREF = "ipv6_addresses";

     private AccessPoint mAccessPoint;
     private final ConnectivityManager mConnectivityManager;
     private final Fragment mFragment;
     private final Handler mHandler;
     private LinkProperties mLinkProperties;
     private Network mNetwork;
     private NetworkInfo mNetworkInfo;
     private NetworkCapabilities mNetworkCapabilities;
     private int mRssiSignalLevel = -1;
     private String[] mSignalStr;
     private WifiConfiguration mWifiConfig;
     private WifiInfo mWifiInfo;
     private final WifiManager mWifiManager;
     private final MetricsFeatureProvider mMetricsFeatureProvider;

     // UI elements - in order of appearance
     private ActionButtonPreference mButtonsPref;
     private EntityHeaderController mEntityHeaderController;
     private WifiDetailPreference mSignalStrengthPref;
     private WifiDetailPreference mLinkSpeedPref;
     private WifiDetailPreference mFrequencyPref;
     private WifiDetailPreference mSecurityPref;
     private WifiDetailPreference mMacAddressPref;
     private WifiDetailPreference mIpAddressPref;
     private WifiDetailPreference mGatewayPref;
     private WifiDetailPreference mSubnetPref;
     private WifiDetailPreference mDnsPref;
     private PreferenceCategory mIpv6Category;
     private Preference mIpv6AddressPref;

     private final IconInjector mIconInjector;
     private final IntentFilter mFilter;
     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             switch (intent.getAction()) {
                 case WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION:
                     if (!intent.getBooleanExtra(WifiManager.EXTRA_MULTIPLE_NETWORKS_CHANGED,
                             false /* defaultValue */)) {
                         // only one network changed
                         WifiConfiguration wifiConfiguration = intent
                                 .getParcelableExtra(WifiManager.EXTRA_WIFI_CONFIGURATION);
                         if (mAccessPoint.matches(wifiConfiguration)) {
                             mWifiConfig = wifiConfiguration;
                         }
                     }
                     // fall through
                 case WifiManager.NETWORK_STATE_CHANGED_ACTION:
                 case WifiManager.RSSI_CHANGED_ACTION:
                     updateInfo();
                     break;
             }
         }
     };

     private final NetworkRequest mNetworkRequest = new NetworkRequest.Builder()
             .clearCapabilities().addTransportType(TRANSPORT_WIFI).build();

     // Must be run on the UI thread since it directly manipulates UI state.
     private final NetworkCallback mNetworkCallback = new NetworkCallback() {
         @Override
         public void onLinkPropertiesChanged(Network network, LinkProperties lp) {
             if (network.equals(mNetwork) && !lp.equals(mLinkProperties)) {
                 mLinkProperties = lp;
                 updateIpLayerInfo();
             }
         }

         private boolean hasCapabilityChanged(NetworkCapabilities nc, int cap) {
             // If this is the first time we get NetworkCapabilities, report that something changed.
             if (mNetworkCapabilities == null) return true;

             // nc can never be null, see ConnectivityService#callCallbackForRequest.
             return mNetworkCapabilities.hasCapability(cap) != nc.hasCapability(cap);
         }

         @Override
         public void onCapabilitiesChanged(Network network, NetworkCapabilities nc) {
             // If the network just validated or lost Internet access, refresh network state.
             // Don't do this on every NetworkCapabilities change because refreshNetworkState
             // sends IPCs to the system server from the UI thread, which can cause jank.
             if (network.equals(mNetwork) && !nc.equals(mNetworkCapabilities)) {
                 if (hasCapabilityChanged(nc, NET_CAPABILITY_VALIDATED) ||
                         hasCapabilityChanged(nc, NET_CAPABILITY_CAPTIVE_PORTAL)) {
                     refreshNetworkState();
                 }
                 mNetworkCapabilities = nc;
                 updateIpLayerInfo();
             }
         }

         @Override
         public void onLost(Network network) {
             if (network.equals(mNetwork)) {
                 exitActivity();
             }
         }
     };

     public static WifiDetailPreferenceController newInstance(
             AccessPoint accessPoint,
             ConnectivityManager connectivityManager,
             Context context,
             Fragment fragment,
             Handler handler,
             Lifecycle lifecycle,
             WifiManager wifiManager,
             MetricsFeatureProvider metricsFeatureProvider) {
         return new WifiDetailPreferenceController(
                 accessPoint, connectivityManager, context, fragment, handler, lifecycle,
                 wifiManager, metricsFeatureProvider, new IconInjector(context));
     }

     @VisibleForTesting
         /* package */ WifiDetailPreferenceController(
             AccessPoint accessPoint,
             ConnectivityManager connectivityManager,
             Context context,
             Fragment fragment,
             Handler handler,
             Lifecycle lifecycle,
             WifiManager wifiManager,
             MetricsFeatureProvider metricsFeatureProvider,
             IconInjector injector) {
         super(context);

         mAccessPoint = accessPoint;
         mConnectivityManager = connectivityManager;
         mFragment = fragment;
         mHandler = handler;
         mSignalStr = context.getResources().getStringArray(R.array.wifi_signal);
         mWifiConfig = accessPoint.getConfig();
         mWifiManager = wifiManager;
         mMetricsFeatureProvider = metricsFeatureProvider;
         mIconInjector = injector;

         mFilter = new IntentFilter();
         mFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
         mFilter.addAction(WifiManager.RSSI_CHANGED_ACTION);
         mFilter.addAction(WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION);

         lifecycle.addObserver(this);
     }

     @Override
     public boolean isAvailable() {
         return true;
     }

     @Override
     public String getPreferenceKey() {
         // Returns null since this controller contains more than one Preference
         return null;
     }

     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);

         setupEntityHeader(screen);

         mButtonsPref = ((ActionButtonPreference) screen.findPreference(KEY_BUTTONS_PREF))
                 .setButton1Text(R.string.forget)
                 .setButton1Positive(false)
                 .setButton1OnClickListener(view -> forgetNetwork())
                 .setButton2Text(R.string.wifi_sign_in_button_text)
                 .setButton2Positive(true)
                 .setButton2OnClickListener(view -> signIntoNetwork());

         mSignalStrengthPref =
                 (WifiDetailPreference) screen.findPreference(KEY_SIGNAL_STRENGTH_PREF);
         mLinkSpeedPref = (WifiDetailPreference) screen.findPreference(KEY_LINK_SPEED);
         mFrequencyPref = (WifiDetailPreference) screen.findPreference(KEY_FREQUENCY_PREF);
         mSecurityPref = (WifiDetailPreference) screen.findPreference(KEY_SECURITY_PREF);

         mMacAddressPref = (WifiDetailPreference) screen.findPreference(KEY_MAC_ADDRESS_PREF);
         mIpAddressPref = (WifiDetailPreference) screen.findPreference(KEY_IP_ADDRESS_PREF);
         mGatewayPref = (WifiDetailPreference) screen.findPreference(KEY_GATEWAY_PREF);
         mSubnetPref = (WifiDetailPreference) screen.findPreference(KEY_SUBNET_MASK_PREF);
         mDnsPref = (WifiDetailPreference) screen.findPreference(KEY_DNS_PREF);

         mIpv6Category = (PreferenceCategory) screen.findPreference(KEY_IPV6_CATEGORY);
         mIpv6AddressPref = screen.findPreference(KEY_IPV6_ADDRESSES_PREF);

         mSecurityPref.setDetailText(mAccessPoint.getSecurityString(false /* concise */));
     }

     private void setupEntityHeader(PreferenceScreen screen) {
         LayoutPreference headerPref = (LayoutPreference) screen.findPreference(KEY_HEADER);
         mEntityHeaderController =
                 EntityHeaderController.newInstance(
                         mFragment.getActivity(), mFragment,
                         headerPref.findViewById(R.id.entity_header));

         ImageView iconView = headerPref.findViewById(R.id.entity_header_icon);
         iconView.setBackground(
                 mContext.getDrawable(R.drawable.ic_settings_widget_background));
         iconView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);

         mEntityHeaderController.setLabel(mAccessPoint.getSsidStr());
     }

     @Override
     public void onResume() {
         // Ensure mNetwork is set before any callbacks above are delivered, since our
         // NetworkCallback only looks at changes to mNetwork.
         mNetwork = mWifiManager.getCurrentNetwork();
         mLinkProperties = mConnectivityManager.getLinkProperties(mNetwork);
         mNetworkCapabilities = mConnectivityManager.getNetworkCapabilities(mNetwork);
         updateInfo();
         mContext.registerReceiver(mReceiver, mFilter);
         mConnectivityManager.registerNetworkCallback(mNetworkRequest, mNetworkCallback,
                 mHandler);
     }

     @Override
     public void onPause() {
         mNetwork = null;
         mLinkProperties = null;
         mNetworkCapabilities = null;
         mNetworkInfo = null;
         mWifiInfo = null;
         mContext.unregisterReceiver(mReceiver);
         mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);
     }

     private void updateInfo() {
         // No need to fetch LinkProperties and NetworkCapabilities, they are updated by the
         // callbacks. mNetwork doesn't change except in onResume.
         mNetworkInfo = mConnectivityManager.getNetworkInfo(mNetwork);
         mWifiInfo = mWifiManager.getConnectionInfo();
         if (mNetwork == null || mNetworkInfo == null || mWifiInfo == null) {
             exitActivity();
             return;
         }

         // Update whether the forget button should be displayed.
         mButtonsPref.setButton1Visible(canForgetNetwork());

         refreshNetworkState();

         // Update Connection Header icon and Signal Strength Preference
         refreshRssiViews();

         // MAC Address Pref
         mMacAddressPref.setDetailText(mWifiInfo.getMacAddress());

         // Link Speed Pref
         int linkSpeedMbps = mWifiInfo.getLinkSpeed();
         mLinkSpeedPref.setVisible(linkSpeedMbps >= 0);
         mLinkSpeedPref.setDetailText(mContext.getString(
                 R.string.link_speed, mWifiInfo.getLinkSpeed()));

         // Frequency Pref
         final int frequency = mWifiInfo.getFrequency();
         String band = null;
         if (frequency >= AccessPoint.LOWER_FREQ_24GHZ
                 && frequency < AccessPoint.HIGHER_FREQ_24GHZ) {
             band = mContext.getResources().getString(R.string.wifi_band_24ghz);
         } else if (frequency >= AccessPoint.LOWER_FREQ_5GHZ
                 && frequency < AccessPoint.HIGHER_FREQ_5GHZ) {
             band = mContext.getResources().getString(R.string.wifi_band_5ghz);
         } else {
             Log.e(TAG, "Unexpected frequency " + frequency);
         }
         mFrequencyPref.setDetailText(band);

         updateIpLayerInfo();
     }

     private void exitActivity() {
         if (DEBUG) {
             Log.d(TAG, "Exiting the WifiNetworkDetailsPage");
         }
         mFragment.getActivity().finish();
     }

     private void refreshNetworkState() {
         mAccessPoint.update(mWifiConfig, mWifiInfo, mNetworkInfo);
         mEntityHeaderController.setSummary(mAccessPoint.getSettingsSummary())
                 .done(mFragment.getActivity(), true /* rebind */);
     }

     private void refreshRssiViews() {
         int signalLevel = mAccessPoint.getLevel();

         if (mRssiSignalLevel == signalLevel) {
             return;
         }
         mRssiSignalLevel = signalLevel;
         Drawable wifiIcon = mIconInjector.getIcon(mRssiSignalLevel);

         wifiIcon.setTint(Utils.getColorAccent(mContext));
         mEntityHeaderController.setIcon(wifiIcon).done(mFragment.getActivity(), true /* rebind */);

         Drawable wifiIconDark = wifiIcon.getConstantState().newDrawable().mutate();
         wifiIconDark.setTint(mContext.getResources().getColor(
                 R.color.wifi_details_icon_color, mContext.getTheme()));
         mSignalStrengthPref.setIcon(wifiIconDark);

         mSignalStrengthPref.setDetailText(mSignalStr[mRssiSignalLevel]);
     }

     private void updatePreference(WifiDetailPreference pref, String detailText) {
         if (!TextUtils.isEmpty(detailText)) {
             pref.setDetailText(detailText);
             pref.setVisible(true);
         } else {
             pref.setVisible(false);
         }
     }

     private void updateIpLayerInfo() {
         mButtonsPref.setButton2Visible(canSignIntoNetwork());
         mButtonsPref.setVisible(canSignIntoNetwork() || canForgetNetwork());

         if (mNetwork == null || mLinkProperties == null) {
             mIpAddressPref.setVisible(false);
             mSubnetPref.setVisible(false);
             mGatewayPref.setVisible(false);
             mDnsPref.setVisible(false);
             mIpv6Category.setVisible(false);
             return;
         }

         // Find IPv4 and IPv6 addresses.
         String ipv4Address = null;
         String subnet = null;
         StringJoiner ipv6Addresses = new StringJoiner("\n");

         for (LinkAddress addr : mLinkProperties.getLinkAddresses()) {
             if (addr.getAddress() instanceof Inet4Address) {
                 ipv4Address = addr.getAddress().getHostAddress();
                 subnet = ipv4PrefixLengthToSubnetMask(addr.getPrefixLength());
             } else if (addr.getAddress() instanceof Inet6Address) {
                 ipv6Addresses.add(addr.getAddress().getHostAddress());
             }
         }

         // Find IPv4 default gateway.
         String gateway = null;
         for (RouteInfo routeInfo : mLinkProperties.getRoutes()) {
             if (routeInfo.isIPv4Default() && routeInfo.hasGateway()) {
                 gateway = routeInfo.getGateway().getHostAddress();
                 break;
             }
         }

         // Find all (IPv4 and IPv6) DNS addresses.
         String dnsServers = mLinkProperties.getDnsServers().stream()
                 .map(InetAddress::getHostAddress)
                 .collect(Collectors.joining("\n"));

         // Update UI.
         updatePreference(mIpAddressPref, ipv4Address);
         updatePreference(mSubnetPref, subnet);
         updatePreference(mGatewayPref, gateway);
         updatePreference(mDnsPref, dnsServers);

         if (ipv6Addresses.length() > 0) {
             mIpv6AddressPref.setSummary(
                     BidiFormatter.getInstance().unicodeWrap(ipv6Addresses.toString()));
             mIpv6Category.setVisible(true);
         } else {
             mIpv6Category.setVisible(false);
         }
     }

     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;
         }
     }

     /**
      * Returns whether the network represented by this preference can be forgotten.
      */
     private boolean canForgetNetwork() {
         return (mWifiInfo != null && mWifiInfo.isEphemeral()) || canModifyNetwork();
     }

     /**
      * Returns whether the network represented by this preference can be modified.
      */
     public boolean canModifyNetwork() {
         return mWifiConfig != null && !WifiUtils.isNetworkLockedDown(mContext, mWifiConfig);
     }

     /**
      * Returns whether the user can sign into the network represented by this preference.
      */
     private boolean canSignIntoNetwork() {
         return WifiUtils.canSignIntoNetwork(mNetworkCapabilities);
     }

     /**
      * Forgets the wifi network associated with this preference.
      */
     private void forgetNetwork() {
         if (mWifiInfo != null && mWifiInfo.isEphemeral()) {
             mWifiManager.disableEphemeralNetwork(mWifiInfo.getSSID());
         } else if (mWifiConfig != null) {
             if (mWifiConfig.isPasspoint()) {
                 mWifiManager.removePasspointConfiguration(mWifiConfig.FQDN);
             } else {
                 mWifiManager.forget(mWifiConfig.networkId, null /* action listener */);
             }
         }
         mMetricsFeatureProvider.action(
                 mFragment.getActivity(), MetricsProto.MetricsEvent.ACTION_WIFI_FORGET);
         mFragment.getActivity().finish();
     }

     /**
      * Sign in to the captive portal found on this wifi network associated with this preference.
      */
     private void signIntoNetwork() {
         mMetricsFeatureProvider.action(
                 mFragment.getActivity(), MetricsProto.MetricsEvent.ACTION_WIFI_SIGNIN);
         mConnectivityManager.startCaptivePortalApp(mNetwork);
     }

     @Override
     public void onForget(WifiDialog dialog) {
         // can't forget network from a 'modify' dialog
     }

     @Override
     public void onSubmit(WifiDialog dialog) {
         if (dialog.getController() != null) {
             mWifiManager.save(dialog.getController().getConfig(), new WifiManager.ActionListener() {
                 @Override
                 public void onSuccess() {
                 }

                 @Override
                 public void onFailure(int reason) {
                     Activity activity = mFragment.getActivity();
                     if (activity != null) {
                         Toast.makeText(activity,
                                 R.string.wifi_failed_save_message,
                                 Toast.LENGTH_SHORT).show();
                     }
                 }
             });
         }
     }

     /**
      * Wrapper for testing compatibility.
      */
     @VisibleForTesting
     static class IconInjector {
         private final Context mContext;

         public IconInjector(Context context) {
             mContext = context;
         }

         public Drawable getIcon(int level) {
             return mContext.getDrawable(Utils.getWifiIconResource(level)).mutate();
         }
     }
 }
	/*
	* 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.settings.wifi.details;

	import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
	import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
	import static android.net.NetworkCapabilities.TRANSPORT_WIFI;

	import android.app.Activity;
	import android.app.Fragment;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.graphics.drawable.Drawable;
	import android.net.ConnectivityManager;
	import android.net.ConnectivityManager.NetworkCallback;
	import android.net.LinkAddress;
	import android.net.LinkProperties;
	import android.net.Network;
	import android.net.NetworkCapabilities;
	import android.net.NetworkInfo;
	import android.net.NetworkRequest;
	import android.net.NetworkUtils;
	import android.net.RouteInfo;
	import android.net.wifi.WifiConfiguration;
	import android.net.wifi.WifiInfo;
	import android.net.wifi.WifiManager;
	import android.os.Handler;
	import androidx.core.text.BidiFormatter;
	import androidx.preference.Preference;
	import androidx.preference.PreferenceCategory;
	import androidx.preference.PreferenceScreen;
	import android.text.TextUtils;
	import android.util.Log;
	import android.widget.ImageView;
	import android.widget.Toast;

	import com.android.internal.annotations.VisibleForTesting;
	import com.android.internal.logging.nano.MetricsProto;
	import com.android.settings.R;
	import com.android.settings.Utils;
	import com.android.settings.applications.LayoutPreference;
	import com.android.settings.core.PreferenceControllerMixin;
	import com.android.settings.widget.ActionButtonPreference;
	import com.android.settings.widget.EntityHeaderController;
	import com.android.settings.wifi.WifiDetailPreference;
	import com.android.settings.wifi.WifiDialog;
	import com.android.settings.wifi.WifiDialog.WifiDialogListener;
	import com.android.settings.wifi.WifiUtils;
	import com.android.settingslib.core.AbstractPreferenceController;
	import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
	import com.android.settingslib.core.lifecycle.Lifecycle;
	import com.android.settingslib.core.lifecycle.LifecycleObserver;
	import com.android.settingslib.core.lifecycle.events.OnPause;
	import com.android.settingslib.core.lifecycle.events.OnResume;
	import com.android.settingslib.wifi.AccessPoint;

	import java.net.Inet4Address;
	import java.net.Inet6Address;
	import java.net.InetAddress;
	import java.net.UnknownHostException;
	import java.util.StringJoiner;
	import java.util.stream.Collectors;

	/**
	* Controller for logic pertaining to displaying Wifi information for the
	* {@link WifiNetworkDetailsFragment}.
	*/
	public class WifiDetailPreferenceController extends AbstractPreferenceController
	implements PreferenceControllerMixin, WifiDialogListener, LifecycleObserver, OnPause,
	OnResume {

	private static final String TAG = "WifiDetailsPrefCtrl";
	private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);

	@VisibleForTesting
	static final String KEY_HEADER = "connection_header";
	@VisibleForTesting
	static final String KEY_BUTTONS_PREF = "buttons";
	@VisibleForTesting
	static final String KEY_SIGNAL_STRENGTH_PREF = "signal_strength";
	@VisibleForTesting
	static final String KEY_LINK_SPEED = "link_speed";
	@VisibleForTesting
	static final String KEY_FREQUENCY_PREF = "frequency";
	@VisibleForTesting
	static final String KEY_SECURITY_PREF = "security";
	@VisibleForTesting
	static final String KEY_MAC_ADDRESS_PREF = "mac_address";
	@VisibleForTesting
	static final String KEY_IP_ADDRESS_PREF = "ip_address";
	@VisibleForTesting
	static final String KEY_GATEWAY_PREF = "gateway";
	@VisibleForTesting
	static final String KEY_SUBNET_MASK_PREF = "subnet_mask";
	@VisibleForTesting
	static final String KEY_DNS_PREF = "dns";
	@VisibleForTesting
	static final String KEY_IPV6_CATEGORY = "ipv6_category";
	@VisibleForTesting
	static final String KEY_IPV6_ADDRESSES_PREF = "ipv6_addresses";

	private AccessPoint mAccessPoint;
	private final ConnectivityManager mConnectivityManager;
	private final Fragment mFragment;
	private final Handler mHandler;
	private LinkProperties mLinkProperties;
	private Network mNetwork;
	private NetworkInfo mNetworkInfo;
	private NetworkCapabilities mNetworkCapabilities;
	private int mRssiSignalLevel = -1;
	private String[] mSignalStr;
	private WifiConfiguration mWifiConfig;
	private WifiInfo mWifiInfo;
	private final WifiManager mWifiManager;
	private final MetricsFeatureProvider mMetricsFeatureProvider;

	// UI elements - in order of appearance
	private ActionButtonPreference mButtonsPref;
	private EntityHeaderController mEntityHeaderController;
	private WifiDetailPreference mSignalStrengthPref;
	private WifiDetailPreference mLinkSpeedPref;
	private WifiDetailPreference mFrequencyPref;
	private WifiDetailPreference mSecurityPref;
	private WifiDetailPreference mMacAddressPref;
	private WifiDetailPreference mIpAddressPref;
	private WifiDetailPreference mGatewayPref;
	private WifiDetailPreference mSubnetPref;
	private WifiDetailPreference mDnsPref;
	private PreferenceCategory mIpv6Category;
	private Preference mIpv6AddressPref;

	private final IconInjector mIconInjector;
	private final IntentFilter mFilter;
	private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	switch (intent.getAction()) {
	case WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION:
	if (!intent.getBooleanExtra(WifiManager.EXTRA_MULTIPLE_NETWORKS_CHANGED,
	false /* defaultValue */)) {
	// only one network changed
	WifiConfiguration wifiConfiguration = intent
	.getParcelableExtra(WifiManager.EXTRA_WIFI_CONFIGURATION);
	if (mAccessPoint.matches(wifiConfiguration)) {
	mWifiConfig = wifiConfiguration;
	}
	}
	// fall through
	case WifiManager.NETWORK_STATE_CHANGED_ACTION:
	case WifiManager.RSSI_CHANGED_ACTION:
	updateInfo();
	break;
	}
	}
	};

	private final NetworkRequest mNetworkRequest = new NetworkRequest.Builder()
	.clearCapabilities().addTransportType(TRANSPORT_WIFI).build();

	// Must be run on the UI thread since it directly manipulates UI state.
	private final NetworkCallback mNetworkCallback = new NetworkCallback() {
	@Override
	public void onLinkPropertiesChanged(Network network, LinkProperties lp) {
	if (network.equals(mNetwork) && !lp.equals(mLinkProperties)) {
	mLinkProperties = lp;
	updateIpLayerInfo();
	}
	}

	private boolean hasCapabilityChanged(NetworkCapabilities nc, int cap) {
	// If this is the first time we get NetworkCapabilities, report that something changed.
	if (mNetworkCapabilities == null) return true;

	// nc can never be null, see ConnectivityService#callCallbackForRequest.
	return mNetworkCapabilities.hasCapability(cap) != nc.hasCapability(cap);
	}

	@Override
	public void onCapabilitiesChanged(Network network, NetworkCapabilities nc) {
	// If the network just validated or lost Internet access, refresh network state.
	// Don't do this on every NetworkCapabilities change because refreshNetworkState
	// sends IPCs to the system server from the UI thread, which can cause jank.
	if (network.equals(mNetwork) && !nc.equals(mNetworkCapabilities)) {
	if (hasCapabilityChanged(nc, NET_CAPABILITY_VALIDATED) \|\|
	hasCapabilityChanged(nc, NET_CAPABILITY_CAPTIVE_PORTAL)) {
	refreshNetworkState();
	}
	mNetworkCapabilities = nc;
	updateIpLayerInfo();
	}
	}

	@Override
	public void onLost(Network network) {
	if (network.equals(mNetwork)) {
	exitActivity();
	}
	}
	};

	public static WifiDetailPreferenceController newInstance(
	AccessPoint accessPoint,
	ConnectivityManager connectivityManager,
	Context context,
	Fragment fragment,
	Handler handler,
	Lifecycle lifecycle,
	WifiManager wifiManager,
	MetricsFeatureProvider metricsFeatureProvider) {
	return new WifiDetailPreferenceController(
	accessPoint, connectivityManager, context, fragment, handler, lifecycle,
	wifiManager, metricsFeatureProvider, new IconInjector(context));
	}

	@VisibleForTesting
	/* package */ WifiDetailPreferenceController(
	AccessPoint accessPoint,
	ConnectivityManager connectivityManager,
	Context context,
	Fragment fragment,
	Handler handler,
	Lifecycle lifecycle,
	WifiManager wifiManager,
	MetricsFeatureProvider metricsFeatureProvider,
	IconInjector injector) {
	super(context);

	mAccessPoint = accessPoint;
	mConnectivityManager = connectivityManager;
	mFragment = fragment;
	mHandler = handler;
	mSignalStr = context.getResources().getStringArray(R.array.wifi_signal);
	mWifiConfig = accessPoint.getConfig();
	mWifiManager = wifiManager;
	mMetricsFeatureProvider = metricsFeatureProvider;
	mIconInjector = injector;

	mFilter = new IntentFilter();
	mFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
	mFilter.addAction(WifiManager.RSSI_CHANGED_ACTION);
	mFilter.addAction(WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION);

	lifecycle.addObserver(this);
	}

	@Override
	public boolean isAvailable() {
	return true;
	}

	@Override
	public String getPreferenceKey() {
	// Returns null since this controller contains more than one Preference
	return null;
	}

	@Override
	public void displayPreference(PreferenceScreen screen) {
	super.displayPreference(screen);

	setupEntityHeader(screen);

	mButtonsPref = ((ActionButtonPreference) screen.findPreference(KEY_BUTTONS_PREF))
	.setButton1Text(R.string.forget)
	.setButton1Positive(false)
	.setButton1OnClickListener(view -> forgetNetwork())
	.setButton2Text(R.string.wifi_sign_in_button_text)
	.setButton2Positive(true)
	.setButton2OnClickListener(view -> signIntoNetwork());

	mSignalStrengthPref =
	(WifiDetailPreference) screen.findPreference(KEY_SIGNAL_STRENGTH_PREF);
	mLinkSpeedPref = (WifiDetailPreference) screen.findPreference(KEY_LINK_SPEED);
	mFrequencyPref = (WifiDetailPreference) screen.findPreference(KEY_FREQUENCY_PREF);
	mSecurityPref = (WifiDetailPreference) screen.findPreference(KEY_SECURITY_PREF);

	mMacAddressPref = (WifiDetailPreference) screen.findPreference(KEY_MAC_ADDRESS_PREF);
	mIpAddressPref = (WifiDetailPreference) screen.findPreference(KEY_IP_ADDRESS_PREF);
	mGatewayPref = (WifiDetailPreference) screen.findPreference(KEY_GATEWAY_PREF);
	mSubnetPref = (WifiDetailPreference) screen.findPreference(KEY_SUBNET_MASK_PREF);
	mDnsPref = (WifiDetailPreference) screen.findPreference(KEY_DNS_PREF);

	mIpv6Category = (PreferenceCategory) screen.findPreference(KEY_IPV6_CATEGORY);
	mIpv6AddressPref = screen.findPreference(KEY_IPV6_ADDRESSES_PREF);

	mSecurityPref.setDetailText(mAccessPoint.getSecurityString(false /* concise */));
	}

	private void setupEntityHeader(PreferenceScreen screen) {
	LayoutPreference headerPref = (LayoutPreference) screen.findPreference(KEY_HEADER);
	mEntityHeaderController =
	EntityHeaderController.newInstance(
	mFragment.getActivity(), mFragment,
	headerPref.findViewById(R.id.entity_header));

	ImageView iconView = headerPref.findViewById(R.id.entity_header_icon);
	iconView.setBackground(
	mContext.getDrawable(R.drawable.ic_settings_widget_background));
	iconView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);

	mEntityHeaderController.setLabel(mAccessPoint.getSsidStr());
	}

	@Override
	public void onResume() {
	// Ensure mNetwork is set before any callbacks above are delivered, since our
	// NetworkCallback only looks at changes to mNetwork.
	mNetwork = mWifiManager.getCurrentNetwork();
	mLinkProperties = mConnectivityManager.getLinkProperties(mNetwork);
	mNetworkCapabilities = mConnectivityManager.getNetworkCapabilities(mNetwork);
	updateInfo();
	mContext.registerReceiver(mReceiver, mFilter);
	mConnectivityManager.registerNetworkCallback(mNetworkRequest, mNetworkCallback,
	mHandler);
	}

	@Override
	public void onPause() {
	mNetwork = null;
	mLinkProperties = null;
	mNetworkCapabilities = null;
	mNetworkInfo = null;
	mWifiInfo = null;
	mContext.unregisterReceiver(mReceiver);
	mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);
	}

	private void updateInfo() {
	// No need to fetch LinkProperties and NetworkCapabilities, they are updated by the
	// callbacks. mNetwork doesn't change except in onResume.
	mNetworkInfo = mConnectivityManager.getNetworkInfo(mNetwork);
	mWifiInfo = mWifiManager.getConnectionInfo();
	if (mNetwork == null \|\| mNetworkInfo == null \|\| mWifiInfo == null) {
	exitActivity();
	return;
	}

	// Update whether the forget button should be displayed.
	mButtonsPref.setButton1Visible(canForgetNetwork());

	refreshNetworkState();

	// Update Connection Header icon and Signal Strength Preference
	refreshRssiViews();

	// MAC Address Pref
	mMacAddressPref.setDetailText(mWifiInfo.getMacAddress());

	// Link Speed Pref
	int linkSpeedMbps = mWifiInfo.getLinkSpeed();
	mLinkSpeedPref.setVisible(linkSpeedMbps >= 0);
	mLinkSpeedPref.setDetailText(mContext.getString(
	R.string.link_speed, mWifiInfo.getLinkSpeed()));

	// Frequency Pref
	final int frequency = mWifiInfo.getFrequency();
	String band = null;
	if (frequency >= AccessPoint.LOWER_FREQ_24GHZ
	&& frequency < AccessPoint.HIGHER_FREQ_24GHZ) {
	band = mContext.getResources().getString(R.string.wifi_band_24ghz);
	} else if (frequency >= AccessPoint.LOWER_FREQ_5GHZ
	&& frequency < AccessPoint.HIGHER_FREQ_5GHZ) {
	band = mContext.getResources().getString(R.string.wifi_band_5ghz);
	} else {
	Log.e(TAG, "Unexpected frequency " + frequency);
	}
	mFrequencyPref.setDetailText(band);

	updateIpLayerInfo();
	}

	private void exitActivity() {
	if (DEBUG) {
	Log.d(TAG, "Exiting the WifiNetworkDetailsPage");
	}
	mFragment.getActivity().finish();
	}

	private void refreshNetworkState() {
	mAccessPoint.update(mWifiConfig, mWifiInfo, mNetworkInfo);
	mEntityHeaderController.setSummary(mAccessPoint.getSettingsSummary())
	.done(mFragment.getActivity(), true /* rebind */);
	}

	private void refreshRssiViews() {
	int signalLevel = mAccessPoint.getLevel();

	if (mRssiSignalLevel == signalLevel) {
	return;
	}
	mRssiSignalLevel = signalLevel;
	Drawable wifiIcon = mIconInjector.getIcon(mRssiSignalLevel);

	wifiIcon.setTint(Utils.getColorAccent(mContext));
	mEntityHeaderController.setIcon(wifiIcon).done(mFragment.getActivity(), true /* rebind */);

	Drawable wifiIconDark = wifiIcon.getConstantState().newDrawable().mutate();
	wifiIconDark.setTint(mContext.getResources().getColor(
	R.color.wifi_details_icon_color, mContext.getTheme()));
	mSignalStrengthPref.setIcon(wifiIconDark);

	mSignalStrengthPref.setDetailText(mSignalStr[mRssiSignalLevel]);
	}

	private void updatePreference(WifiDetailPreference pref, String detailText) {
	if (!TextUtils.isEmpty(detailText)) {
	pref.setDetailText(detailText);
	pref.setVisible(true);
	} else {
	pref.setVisible(false);
	}
	}

	private void updateIpLayerInfo() {
	mButtonsPref.setButton2Visible(canSignIntoNetwork());
	mButtonsPref.setVisible(canSignIntoNetwork() \|\| canForgetNetwork());

	if (mNetwork == null \|\| mLinkProperties == null) {
	mIpAddressPref.setVisible(false);
	mSubnetPref.setVisible(false);
	mGatewayPref.setVisible(false);
	mDnsPref.setVisible(false);
	mIpv6Category.setVisible(false);
	return;
	}

	// Find IPv4 and IPv6 addresses.
	String ipv4Address = null;
	String subnet = null;
	StringJoiner ipv6Addresses = new StringJoiner("\n");

	for (LinkAddress addr : mLinkProperties.getLinkAddresses()) {
	if (addr.getAddress() instanceof Inet4Address) {
	ipv4Address = addr.getAddress().getHostAddress();
	subnet = ipv4PrefixLengthToSubnetMask(addr.getPrefixLength());
	} else if (addr.getAddress() instanceof Inet6Address) {
	ipv6Addresses.add(addr.getAddress().getHostAddress());
	}
	}

	// Find IPv4 default gateway.
	String gateway = null;
	for (RouteInfo routeInfo : mLinkProperties.getRoutes()) {
	if (routeInfo.isIPv4Default() && routeInfo.hasGateway()) {
	gateway = routeInfo.getGateway().getHostAddress();
	break;
	}
	}

	// Find all (IPv4 and IPv6) DNS addresses.
	String dnsServers = mLinkProperties.getDnsServers().stream()
	.map(InetAddress::getHostAddress)
	.collect(Collectors.joining("\n"));

	// Update UI.
	updatePreference(mIpAddressPref, ipv4Address);
	updatePreference(mSubnetPref, subnet);
	updatePreference(mGatewayPref, gateway);
	updatePreference(mDnsPref, dnsServers);

	if (ipv6Addresses.length() > 0) {
	mIpv6AddressPref.setSummary(
	BidiFormatter.getInstance().unicodeWrap(ipv6Addresses.toString()));
	mIpv6Category.setVisible(true);
	} else {
	mIpv6Category.setVisible(false);
	}
	}

	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;
	}
	}

	/**
	* Returns whether the network represented by this preference can be forgotten.
	*/
	private boolean canForgetNetwork() {
	return (mWifiInfo != null && mWifiInfo.isEphemeral()) \|\| canModifyNetwork();
	}

	/**
	* Returns whether the network represented by this preference can be modified.
	*/
	public boolean canModifyNetwork() {
	return mWifiConfig != null && !WifiUtils.isNetworkLockedDown(mContext, mWifiConfig);
	}

	/**
	* Returns whether the user can sign into the network represented by this preference.
	*/
	private boolean canSignIntoNetwork() {
	return WifiUtils.canSignIntoNetwork(mNetworkCapabilities);
	}

	/**
	* Forgets the wifi network associated with this preference.
	*/
	private void forgetNetwork() {
	if (mWifiInfo != null && mWifiInfo.isEphemeral()) {
	mWifiManager.disableEphemeralNetwork(mWifiInfo.getSSID());
	} else if (mWifiConfig != null) {
	if (mWifiConfig.isPasspoint()) {
	mWifiManager.removePasspointConfiguration(mWifiConfig.FQDN);
	} else {
	mWifiManager.forget(mWifiConfig.networkId, null /* action listener */);
	}
	}
	mMetricsFeatureProvider.action(
	mFragment.getActivity(), MetricsProto.MetricsEvent.ACTION_WIFI_FORGET);
	mFragment.getActivity().finish();
	}

	/**
	* Sign in to the captive portal found on this wifi network associated with this preference.
	*/
	private void signIntoNetwork() {
	mMetricsFeatureProvider.action(
	mFragment.getActivity(), MetricsProto.MetricsEvent.ACTION_WIFI_SIGNIN);
	mConnectivityManager.startCaptivePortalApp(mNetwork);
	}

	@Override
	public void onForget(WifiDialog dialog) {
	// can't forget network from a 'modify' dialog
	}

	@Override
	public void onSubmit(WifiDialog dialog) {
	if (dialog.getController() != null) {
	mWifiManager.save(dialog.getController().getConfig(), new WifiManager.ActionListener() {
	@Override
	public void onSuccess() {
	}

	@Override
	public void onFailure(int reason) {
	Activity activity = mFragment.getActivity();
	if (activity != null) {
	Toast.makeText(activity,
	R.string.wifi_failed_save_message,
	Toast.LENGTH_SHORT).show();
	}
	}
	});
	}
	}

	/**
	* Wrapper for testing compatibility.
	*/
	@VisibleForTesting
	static class IconInjector {
	private final Context mContext;

	public IconInjector(Context context) {
	mContext = context;
	}

	public Drawable getIcon(int level) {
	return mContext.getDrawable(Utils.getWifiIconResource(level)).mutate();
	}
	}
	}