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