浅析 Android 开发文档的 SexualActivityRecord 类

刚刚网上冲浪看到 reddit 热门被吓一跳，还以为 Android 搞了个大新闻，瞬间标题都想好了：谷歌 Android 系统逆天操作——监控“为爱鼓掌”频率。

https://www.reddit.com/r/programming/comments/16iy537/android_has_a_separate_class_and_documentation_to/

再看一眼，原来是说 Android 开发文档提供了用于记录性生活频率的 "SexualActivityRecord" 类。

https://developer.android.com/reference/androidx/health/connect/client/records/SexualActivityRecord

那就看看谷歌工程师如何编写这个类。

可以看到这个类总共有 3 个常量，代表了 Sex 是否采取保护措施：

• 1：已做安全保护
• 0：未知
• 2：无安全保护

公有方法主要有 getProtectionUsed()、getTime()、getZoneOffset()。

前面两个都能理解，获取保护措施情况和发生时间，但最后的 ZoneOffset 是啥意思？麻烦大佬们解答一下。

众所周知，Kotlin 早已成为 Android 官方支持的开发语言，所以这个类的代码也是 Kotlin 写的，总共不到 100 行：

SexualActivityRecord.kt

 /* * Copyright (C) 2022 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package androidx.health.connect.client.records import androidx.annotation.IntDef import androidx.annotation.RestrictTo import androidx.health.connect.client.records.metadata.Metadata import java.time.Instant import java.time.ZoneOffset /** * Captures an occurrence of sexual activity. Each record is a single occurrence. ProtectionUsed * field is optional. */ public class SexualActivityRecord( override val time: Instant, override val zoneOffset: ZoneOffset?, /** * Whether protection was used during sexual activity. Optional field, null if unknown. Allowed * values: [Protection]. * * @see Protection */ @property:Protections public val protectionUsed: Int = PROTECTION_USED_UNKNOWN, override val metadata: Metadata = Metadata.EMPTY, ) : InstantaneousRecord { override fun equals(other: Any?): Boolean { if (this === other) return true if (other !is SexualActivityRecord) return false if (protectionUsed != other.protectionUsed) return false if (time != other.time) return false if (zoneOffset != other.zoneOffset) return false if (metadata != other.metadata) return false return true } override fun hashCode(): Int { var result = protectionUsed result = 31 * result + time.hashCode() result = 31 * result + (zoneOffset?.hashCode() ?: 0) result = 31 * result + metadata.hashCode() return result } companion object { const val PROTECTION_USED_UNKNOWN = 0 const val PROTECTION_USED_PROTECTED = 1 const val PROTECTION_USED_UNPROTECTED = 2 /** Internal mappings useful for interoperability between integers and strings. */ @RestrictTo(RestrictTo.Scope.LIBRARY) @JvmField val PROTECTION_USED_STRING_TO_INT_MAP: Map<String, Int> = mapOf( Protection.PROTECTED to PROTECTION_USED_PROTECTED, Protection.UNPROTECTED to PROTECTION_USED_UNPROTECTED, ) @RestrictTo(RestrictTo.Scope.LIBRARY) @JvmField val PROTECTION_USED_INT_TO_STRING_MAP = PROTECTION_USED_STRING_TO_INT_MAP.reverse() } /** Whether protection was used during sexual activity. */ internal object Protection { const val PROTECTED = "protected" const val UNPROTECTED = "unprotected" } /** * Whether protection was used during sexual activity. */ @Retention(AnnotationRetention.SOURCE) @IntDef( value = [ PROTECTION_USED_PROTECTED, PROTECTION_USED_UNPROTECTED, ] ) @RestrictTo(RestrictTo.Scope.LIBRARY) annotation class Protections }

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好了，本次分享到此为止，欢迎大家各抒己见。如果让你来负责写这个类，会怎么实现？