See the Activities document for information about saving and restoringstate.
关于保存和恢复状态的详细信息，请参阅activities文档。
2
Fragments: Various samples that demonstrate fragment layouts, back stack, restoringstate, and more.
Fragments：演示fragment布局，回退栈，状态存储等
3
These services are monitored during the manage phase for timely responsiveness for different service requests, detecting failures at service levels, and restoring the operational state of the system.