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      1 /*
      2  * Copyright (C) 2015 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 package com.android.settingslib;
     17 
     18 import android.app.ActivityManager;
     19 import android.content.ComponentName;
     20 import android.content.ContentResolver;
     21 import android.content.Context;
     22 import android.content.res.Resources;
     23 import android.net.ConnectivityManager;
     24 import android.net.wifi.WifiManager;
     25 import android.os.SystemProperties;
     26 import android.os.UserHandle;
     27 import android.provider.Settings;
     28 
     29 public class TetherUtil {
     30 
     31     // Types of tethering.
     32     public static final int TETHERING_INVALID   = -1;
     33     public static final int TETHERING_WIFI      = 0;
     34     public static final int TETHERING_USB       = 1;
     35     public static final int TETHERING_BLUETOOTH = 2;
     36 
     37     // Extras used for communicating with the TetherService.
     38     public static final String EXTRA_ADD_TETHER_TYPE = "extraAddTetherType";
     39     public static final String EXTRA_REM_TETHER_TYPE = "extraRemTetherType";
     40     public static final String EXTRA_SET_ALARM = "extraSetAlarm";
     41     /**
     42      * Tells the service to run a provision check now.
     43      */
     44     public static final String EXTRA_RUN_PROVISION = "extraRunProvision";
     45     /**
     46      * Enables wifi tethering if the provision check is successful. Used by
     47      * QS to enable tethering.
     48      */
     49     public static final String EXTRA_ENABLE_WIFI_TETHER = "extraEnableWifiTether";
     50 
     51     public static ComponentName TETHER_SERVICE = ComponentName.unflattenFromString(Resources
     52             .getSystem().getString(com.android.internal.R.string.config_wifi_tether_enable));
     53 
     54     public static boolean setWifiTethering(boolean enable, Context context) {
     55         final WifiManager wifiManager =
     56                 (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
     57         final ContentResolver cr = context.getContentResolver();
     58         /**
     59          * Disable Wifi if enabling tethering
     60          */
     61         int wifiState = wifiManager.getWifiState();
     62         if (enable && ((wifiState == WifiManager.WIFI_STATE_ENABLING) ||
     63                     (wifiState == WifiManager.WIFI_STATE_ENABLED))) {
     64             wifiManager.setWifiEnabled(false);
     65             Settings.Global.putInt(cr, Settings.Global.WIFI_SAVED_STATE, 1);
     66         }
     67 
     68         boolean success = wifiManager.setWifiApEnabled(null, enable);
     69         /**
     70          *  If needed, restore Wifi on tether disable
     71          */
     72         if (!enable) {
     73             int wifiSavedState = Settings.Global.getInt(cr, Settings.Global.WIFI_SAVED_STATE, 0);
     74             if (wifiSavedState == 1) {
     75                 wifiManager.setWifiEnabled(true);
     76                 Settings.Global.putInt(cr, Settings.Global.WIFI_SAVED_STATE, 0);
     77             }
     78         }
     79         return success;
     80     }
     81 
     82     public static boolean isWifiTetherEnabled(Context context) {
     83         WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
     84         return wifiManager.getWifiApState() == WifiManager.WIFI_AP_STATE_ENABLED;
     85     }
     86 
     87     public static boolean isProvisioningNeeded(Context context) {
     88         // Keep in sync with other usage of config_mobile_hotspot_provision_app.
     89         // ConnectivityManager#enforceTetherChangePermission
     90         String[] provisionApp = context.getResources().getStringArray(
     91                 com.android.internal.R.array.config_mobile_hotspot_provision_app);
     92         if (SystemProperties.getBoolean("net.tethering.noprovisioning", false)
     93                 || provisionApp == null) {
     94             return false;
     95         }
     96         return (provisionApp.length == 2);
     97     }
     98 
     99     public static boolean isTetheringSupported(Context context) {
    100         final ConnectivityManager cm =
    101                 (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    102         final boolean isSecondaryUser = ActivityManager.getCurrentUser() != UserHandle.USER_OWNER;
    103         return !isSecondaryUser && cm.isTetheringSupported();
    104     }
    105 
    106 }
    107