Home | History | Annotate | Download | only in tether 
      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.wifi.tether;
     18 
     19 import static android.net.ConnectivityManager.ACTION_TETHER_STATE_CHANGED;
     20 import static android.net.wifi.WifiManager.WIFI_AP_STATE_CHANGED_ACTION;
     21 
     22 import android.content.BroadcastReceiver;
     23 import android.content.Context;
     24 import android.content.Intent;
     25 import android.content.IntentFilter;
     26 import android.net.wifi.WifiConfiguration;
     27 import android.net.wifi.WifiManager;
     28 import android.os.Bundle;
     29 import android.os.UserManager;
     30 import android.support.annotation.VisibleForTesting;
     31 import android.util.Log;
     32 
     33 import com.android.internal.logging.nano.MetricsProto;
     34 import com.android.settings.R;
     35 import com.android.settings.SettingsActivity;
     36 import com.android.settings.dashboard.RestrictedDashboardFragment;
     37 import com.android.settings.widget.SwitchBar;
     38 import com.android.settings.widget.SwitchBarController;
     39 import com.android.settingslib.core.AbstractPreferenceController;
     40 
     41 import java.util.ArrayList;
     42 import java.util.List;
     43 
     44 public class WifiTetherSettings extends RestrictedDashboardFragment
     45         implements WifiTetherBasePreferenceController.OnTetherConfigUpdateListener {
     46 
     47     private static final String TAG = "WifiTetherSettings";
     48     private static final IntentFilter TETHER_STATE_CHANGE_FILTER;
     49     private static final String KEY_WIFI_TETHER_AUTO_OFF = "wifi_tether_auto_turn_off";
     50 
     51     private WifiTetherSwitchBarController mSwitchBarController;
     52     private WifiTetherSSIDPreferenceController mSSIDPreferenceController;
     53     private WifiTetherPasswordPreferenceController mPasswordPreferenceController;
     54     private WifiTetherApBandPreferenceController mApBandPreferenceController;
     55     private WifiTetherSecurityPreferenceController mSecurityPreferenceController;
     56 
     57     private WifiManager mWifiManager;
     58     private boolean mRestartWifiApAfterConfigChange;
     59 
     60     @VisibleForTesting
     61     TetherChangeReceiver mTetherChangeReceiver;
     62 
     63     static {
     64         TETHER_STATE_CHANGE_FILTER = new IntentFilter(ACTION_TETHER_STATE_CHANGED);
     65         TETHER_STATE_CHANGE_FILTER.addAction(WIFI_AP_STATE_CHANGED_ACTION);
     66     }
     67 
     68     public WifiTetherSettings() {
     69         super(UserManager.DISALLOW_CONFIG_TETHERING);
     70     }
     71 
     72     @Override
     73     public int getMetricsCategory() {
     74         return MetricsProto.MetricsEvent.WIFI_TETHER_SETTINGS;
     75     }
     76 
     77     @Override
     78     protected String getLogTag() {
     79         return "WifiTetherSettings";
     80     }
     81 
     82     @Override
     83     public void onAttach(Context context) {
     84         super.onAttach(context);
     85         mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
     86         mTetherChangeReceiver = new TetherChangeReceiver();
     87     }
     88 
     89     @Override
     90     public void onActivityCreated(Bundle savedInstanceState) {
     91         super.onActivityCreated(savedInstanceState);
     92         // Assume we are in a SettingsActivity. This is only safe because we currently use
     93         // SettingsActivity as base for all preference fragments.
     94         final SettingsActivity activity = (SettingsActivity) getActivity();
     95         final SwitchBar switchBar = activity.getSwitchBar();
     96         mSwitchBarController = new WifiTetherSwitchBarController(activity,
     97                 new SwitchBarController(switchBar));
     98         getLifecycle().addObserver(mSwitchBarController);
     99         switchBar.show();
    100     }
    101 
    102     @Override
    103     public void onStart() {
    104         super.onStart();
    105         final Context context = getContext();
    106         if (context != null) {
    107             context.registerReceiver(mTetherChangeReceiver, TETHER_STATE_CHANGE_FILTER);
    108         }
    109     }
    110 
    111     @Override
    112     public void onStop() {
    113         super.onStop();
    114         final Context context = getContext();
    115         if (context != null) {
    116             context.unregisterReceiver(mTetherChangeReceiver);
    117         }
    118     }
    119 
    120 
    121     @Override
    122     protected int getPreferenceScreenResId() {
    123         return R.xml.wifi_tether_settings;
    124     }
    125 
    126     @Override
    127     protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
    128         final List<AbstractPreferenceController> controllers = new ArrayList<>();
    129         mSSIDPreferenceController = new WifiTetherSSIDPreferenceController(context, this);
    130         mSecurityPreferenceController = new WifiTetherSecurityPreferenceController(context, this);
    131         mPasswordPreferenceController = new WifiTetherPasswordPreferenceController(context, this);
    132         mApBandPreferenceController = new WifiTetherApBandPreferenceController(context, this);
    133 
    134         controllers.add(mSSIDPreferenceController);
    135         controllers.add(mSecurityPreferenceController);
    136         controllers.add(mPasswordPreferenceController);
    137         controllers.add(mApBandPreferenceController);
    138         controllers.add(
    139                 new WifiTetherAutoOffPreferenceController(context, KEY_WIFI_TETHER_AUTO_OFF));
    140         return controllers;
    141     }
    142 
    143     @Override
    144     public void onTetherConfigUpdated() {
    145         final WifiConfiguration config = buildNewConfig();
    146         mPasswordPreferenceController.updateVisibility(config.getAuthType());
    147 
    148         /**
    149          * if soft AP is stopped, bring up
    150          * else restart with new config
    151          * TODO: update config on a running access point when framework support is added
    152          */
    153         if (mWifiManager.getWifiApState() == WifiManager.WIFI_AP_STATE_ENABLED) {
    154             Log.d("TetheringSettings",
    155                     "Wifi AP config changed while enabled, stop and restart");
    156             mRestartWifiApAfterConfigChange = true;
    157             mSwitchBarController.stopTether();
    158         }
    159         mWifiManager.setWifiApConfiguration(config);
    160     }
    161 
    162     private WifiConfiguration buildNewConfig() {
    163         final WifiConfiguration config = new WifiConfiguration();
    164         final int securityType = mSecurityPreferenceController.getSecurityType();
    165 
    166         config.SSID = mSSIDPreferenceController.getSSID();
    167         config.allowedKeyManagement.set(securityType);
    168         config.preSharedKey = mPasswordPreferenceController.getPasswordValidated(securityType);
    169         config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
    170         config.apBand = mApBandPreferenceController.getBandIndex();
    171         return config;
    172     }
    173 
    174     private void startTether() {
    175         mRestartWifiApAfterConfigChange = false;
    176         mSwitchBarController.startTether();
    177     }
    178 
    179     private void updateDisplayWithNewConfig() {
    180         use(WifiTetherSSIDPreferenceController.class)
    181                 .updateDisplay();
    182         use(WifiTetherSecurityPreferenceController.class)
    183                 .updateDisplay();
    184         use(WifiTetherPasswordPreferenceController.class)
    185                 .updateDisplay();
    186         use(WifiTetherApBandPreferenceController.class)
    187                 .updateDisplay();
    188     }
    189 
    190     @VisibleForTesting
    191     class TetherChangeReceiver extends BroadcastReceiver {
    192         @Override
    193         public void onReceive(Context content, Intent intent) {
    194             String action = intent.getAction();
    195             Log.d(TAG, "updating display config due to receiving broadcast action " + action);
    196             updateDisplayWithNewConfig();
    197             if (action.equals(ACTION_TETHER_STATE_CHANGED)) {
    198                 if (mWifiManager.getWifiApState() == WifiManager.WIFI_AP_STATE_DISABLED
    199                         && mRestartWifiApAfterConfigChange) {
    200                     startTether();
    201                 }
    202             } else if (action.equals(WIFI_AP_STATE_CHANGED_ACTION)) {
    203                 int state = intent.getIntExtra(WifiManager.EXTRA_WIFI_AP_STATE, 0);
    204                 if (state == WifiManager.WIFI_AP_STATE_DISABLED
    205                         && mRestartWifiApAfterConfigChange) {
    206                     startTether();
    207                 }
    208             }
    209         }
    210     }
    211 }
    212