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App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
...> 手机操作系统 -> App（即使未打开）
关键特征：
1. 操作系统级别：由 Android/iOS 系统进程接收，不需要 App 运行
2. 持久连接：手机系统与推送服务器保持长连接（不是 App 自己的连接）
3. 省电：所有 App 共享同一条系统...
What are all the different ways to create an object in Java?
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edited Mar 18 '19 at 23:45
Hearen
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