242 |
243 | **可以看出，这次改动 Google 是希望提高用户对前台服务的控制性**。在旧版本的前台服务并没有直接的停止按钮，只有一些些友好的应用会在前台服务通知中使用可操作性的关闭按钮。
244 |
245 | 相关资料：[前台服务 (FGS) 任务管理器](https://developer.android.google.cn/about/versions/13/changes/fgs-manager)
246 |
247 | ### 6.2 JobScheduler 预提取作业优化
248 |
249 | JobScheduler 预提取作业是 Android 9 引入的机制，通过调用 [JobInfo.Builder.setPrefetch(true)](https://developer.android.google.cn/reference/android/app/job/JobInfo.Builder#setPrefetch(boolean)) 能够将该作业标记为 “预提取” 作业，理想情况下，开发者的预期是该作业应该在应用下一次启动前一点运行，以提升用户体验。
250 |
251 | 在旧版本中，系统只会在有充足的过剩资源时，才会允许预提取作业运行。从 Android 13 开始，系统会更智能地基于机器学习预测应用下次启动的时间，并根据该估算值执行预提取作业。此外，预提取任务也不再允许设置最后执行期限 [setOverrideDeadline(long)](https://developer.android.google.cn/reference/android/app/job/JobInfo.Builder#setOverrideDeadline(long))。
252 |
253 | ### 6.3 省电措施改进
254 |
255 | Android 13 系统引入了一些新的电池省电措施，以便为系统提供更多方法来管理电池续航时间。
256 |
257 | - **更新了应用进入 “受限” 待机分区的规则：** App Standby Buckets 应用待机分区是 Android 9 引入的电池管理功能，“受限” 待机分区是 Android 12 新增的待机分区，主要面向消耗大量系统资源的应用（目前有 “活跃、工作集、常用、极少使用、受限、从未使用” 等待机分区）；
258 | - **更新了 “受限” 后台电池电量的新限制：** 后台电量限制是 Android 9 引入的电池管理功能，能够让用户调整应用处于后台运行时可以执行的工作量（目前有 “无限制、优化（默认）、受限” 等选项）；
259 | - **新增一个电量提醒系统通知：** Android 13 引入了一个新的系统通知，当应用在 24 小时内消耗了大量电池电量时会显示；
260 | - **新增一个前台服务提醒系统通知：** Android 13 引入了一个新的系统通知，当应用的某项前台服务在 24 小时内至少运行了 20 小时时会显示；
261 |
262 | 相关资料：[电池资源利用率](https://developer.android.google.cn/about/versions/13/changes/battery#system-notification-long-running-fgs)
263 |
264 | **以下变更相对冷门，实用价值较低，本文暂且按住不表：**
265 |
266 | 新功能 - 用户体验 - 快捷磁贴放置 API
267 |
268 | 新功能 - 用户体验 - 多语言用户 - 文本转换 API & Unicode 库更新
269 |
270 | 新功能 - 用户体验 - 更快断字 & 彩色矢量字体 & 蓝牙 LE 音频 & MIDI 2.0
271 |
272 | 新功能 - 隐私安全 - APK 签名 v3.1
273 |
274 | 新功能 - 图形 - 可编程的着色器
275 |
276 | 新功能 - 核心功能 - OpenJDK 11 更新
277 |
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