四大组件是：activity、service、content provider、broadcast receiver
四大组件、五大存储、六大布局：
https://blog.csdn.net/shenggaofei/article/details/52450668
https://www.cnblogs.com/tsingke/p/9007563.html
Activity
生命周期：https://blog.csdn.net/javazejian/article/details/51932554
Activity启动模式和任务栈：https://blog.csdn.net/javazejian/article/details/52071885
Service
https://blog.csdn.net/guolin_blog/article/details/11952435
https://blog.csdn.net/javazejian/article/details/52709857
Content provider
https://blog.csdn.net/carson_ho/article/details/76101093
Broadcast receiver
https://blog.csdn.net/carson_ho/article/details/52973504
https://www.jianshu.com/p/f348f6d7fe59
布局
https://blog.csdn.net/carson_ho/article/details/51719519
https://blog.csdn.net/halaoda/article/details/78504485?utm_source=blogxgwz2
存储
SharedPreferences：
https://www.jianshu.com/p/59b266c644f3
https://juejin.im/post/5adc444df265da0b886d00bc
https://www.jianshu.com/p/d2a12f531d97
文件存储：
https://juejin.im/post/5a615c796fb9a01caf377b20
https://blog.csdn.net/u010937230/article/details/73303034
SQLite数据库：
https://www.cnblogs.com/foxy/p/7725010.html
https://blog.csdn.net/column/details/android-database-pro.html
内容提供器（Content provider）：
网络存储方式：
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