1 /* 2 * Copyright (C) 2021 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 android.permission.internal.compat; 18 19 import android.annotation.UserIdInt; 20 import android.os.UserHandle; 21 22 /** 23 * Helper for accessing features in {@link UserHandle}. 24 */ 25 public final class UserHandleCompat { 26 /** 27 * A user ID to indicate all users on the device. 28 */ 29 public static final int USER_ALL = UserHandle.ALL.getIdentifier(); 30 31 /** 32 * A user ID to indicate an undefined user of the device. 33 * 34 * @see UserHandle#USER_NULL 35 */ 36 public static final @UserIdInt int USER_NULL = -10000; 37 38 /** 39 * A user ID to indicate the "system" user of the device. 40 */ 41 public static final int USER_SYSTEM = UserHandle.SYSTEM.getIdentifier(); 42 UserHandleCompat()43 private UserHandleCompat() {} 44 45 /** 46 * Get the user ID of a given UID. 47 * 48 * @param uid the UID 49 * @return the user ID 50 */ 51 @UserIdInt getUserId(int uid)52 public static int getUserId(int uid) { 53 return UserHandle.getUserHandleForUid(uid).getIdentifier(); 54 } 55 56 /** 57 * Get the UID from the give user ID and app ID 58 * 59 * @param userId the user ID 60 * @param appId the app ID 61 * @return the UID 62 */ getUid(@serIdInt int userId, int appId)63 public static int getUid(@UserIdInt int userId, int appId) { 64 return UserHandle.of(userId).getUid(appId); 65 } 66 } 67