Android -Activity知识梳理

Android 系统架构

1 liunx内核层

2 libraries（库） 运行时

3 Framwork

4 Application

Android APP组件架构

1 Activity

2 BroadcastReciever

3 ContentProvider

4 Service

Android 状态

• Running
• Paused
• Stopped
• Killed

Android 正常生命周期

1.onCreate()
2.onRestart()
3.onStart()
4.onResume()
5.onPause()
6.onStop()
7.onDestroy()

Android 异常生命周期

1.onSaveInstanceState(Bundle outState)
2.onRestoreInstanceState(Bundle saveInstanceState)

Android 启动/销毁

onCreate()
onStart()
onResume()
启动完成
onPause()
onStop()
onDestory()
销毁结束

Android 暂停/恢复

onPause() 释放系统资源
onResume() 重新初始化onPause()中释放的资源

Android 停止/恢复

onStop()
onRestart()
onStart()
onResume()