1 /* 2 * Copyright (C) 2020 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.server.wifi; 18 19 import android.content.ContentResolver; 20 import android.content.Context; 21 import android.database.ContentObserver; 22 import android.os.Handler; 23 import android.provider.Settings; 24 import android.util.Log; 25 26 import com.android.internal.annotations.VisibleForTesting; 27 28 /** 29 * Note: This is a hack to provide backward compatibility with the 30 * {@link Settings.Global#WIFI_SCAN_ALWAYS_AVAILABLE} @hide settings usage. We migrated storage 31 * of the scan always available state from this setting to our internal storage, but need to support 32 * the existing @hide users. 33 * TODO(b/149954910): We should find a path to stop supporting this! 34 */ 35 public class WifiScanAlwaysAvailableSettingsCompatibility { 36 private static final String TAG = "WifiScanAlwaysAvailableSettingsCompatibility"; 37 38 /** 39 * Copy of the settings string. Can't directly use the constant because it is @hide. 40 */ 41 @VisibleForTesting 42 public static final String SETTINGS_GLOBAL_WIFI_SCAN_ALWAYS_AVAILABLE = 43 "wifi_scan_always_enabled"; 44 45 private final Context mContext; 46 private final ContentResolver mContentResolver; 47 private final Handler mHandler; 48 private final WifiSettingsStore mWifiSettingsStore; 49 private final ActiveModeWarden mActiveModeWarden; 50 private final FrameworkFacade mFrameworkFacade; 51 WifiScanAlwaysAvailableSettingsCompatibility(Context context, Handler handler, WifiSettingsStore wifiSettingsStore, ActiveModeWarden activeModeWarden, FrameworkFacade frameworkFacade)52 public WifiScanAlwaysAvailableSettingsCompatibility(Context context, 53 Handler handler, WifiSettingsStore wifiSettingsStore, 54 ActiveModeWarden activeModeWarden, FrameworkFacade frameworkFacade) { 55 mContext = context; 56 mHandler = handler; 57 mWifiSettingsStore = wifiSettingsStore; 58 mActiveModeWarden = activeModeWarden; 59 mFrameworkFacade = frameworkFacade; 60 61 // Cache the content resolver to ensure that we can detect self changes. 62 mContentResolver = context.getContentResolver(); 63 } 64 65 /** 66 * Register settings change observer. 67 */ initialize()68 public void initialize() { 69 ContentObserver contentObserver = new ContentObserver(mHandler) { 70 @Override 71 public void onChange(boolean selfChange) { 72 // Ignore any changes we triggered to avoid causing a loop. 73 if (selfChange) return; 74 75 boolean settingsIsAvailable = 76 mFrameworkFacade.getIntegerSetting( 77 mContentResolver, SETTINGS_GLOBAL_WIFI_SCAN_ALWAYS_AVAILABLE, 0) 78 == 1; 79 // Check if the new state is different from our current state. 80 if (mWifiSettingsStore.isScanAlwaysAvailableToggleEnabled() 81 != settingsIsAvailable) { 82 Log.i(TAG, "settings changed, new value: " + settingsIsAvailable 83 + ", triggering update"); 84 mWifiSettingsStore.handleWifiScanAlwaysAvailableToggled(settingsIsAvailable); 85 mActiveModeWarden.scanAlwaysModeChanged(); 86 } 87 } 88 }; 89 mContentResolver.registerContentObserver( 90 Settings.Global.getUriFor(SETTINGS_GLOBAL_WIFI_SCAN_ALWAYS_AVAILABLE), 91 false, contentObserver); 92 } 93 94 /** 95 * Handle scan always available toggle from {@link android.net.wifi.WifiManager# 96 * setScanAlwaysAvailable(boolean)} 97 */ handleWifiScanAlwaysAvailableToggled(boolean isAvailable)98 public void handleWifiScanAlwaysAvailableToggled(boolean isAvailable) { 99 mFrameworkFacade.setIntegerSetting( 100 mContentResolver, SETTINGS_GLOBAL_WIFI_SCAN_ALWAYS_AVAILABLE, isAvailable ? 1 : 0); 101 } 102 } 103