android Activity LifeCycle

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本文详细记录了Android应用中Activity在不同场景下的生命周期变化，包括应用启动、横竖屏切换、来电中断及被其他应用遮挡等情况，对于理解Activity状态转换及其回调方法提供了直观的示例。

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android横竖屏切换时候的Activity LifeCycle

程序启动

01-23 18:33:47.711: I/MainActivity(11233): ------------> onCreate()
01-23 18:33:47.711: I/MainActivity(11233): ------------> onStart()
01-23 18:33:47.711: I/MainActivity(11233): ------------> onResume()
切换后

01-23 18:33:54.221: I/MainActivity(11233): ------------> onPause()
01-23 18:33:54.221: I/MainActivity(11233): ------------> onStop()
01-23 18:33:54.221: I/MainActivity(11233): ------------> onDestroy()

01-23 18:33:54.321: I/MainActivity(11233): ------------> onCreate()
01-23 18:33:54.321: I/MainActivity(11233): ------------> onStart()
01-23 18:33:54.321: I/MainActivity(11233): ------------> onResume()

android横竖屏切换时候的Activity LifeCycle

程序启动

02-27 14:32:54.551: I/MainActivity(10367): ------------> onCreate()
02-27 14:32:54.551: I/MainActivity(10367): ------------> onStart()
02-27 14:32:54.551: I/MainActivity(10367): ------------> onResume()

来电话的时候

02-27 14:33:11.461: I/MainActivity(10367): ------------> onPause()
02-27 14:33:11.861: I/MainActivity(10367): ------------> onStop()
02-27 14:33:14.031: I/MainActivity(10483): ------------> onCreate()
02-27 14:33:14.031: I/MainActivity(10483): ------------> onStart()
02-27 14:33:14.041: I/MainActivity(10483): ------------> onResume()

被其他程序遮挡的时候

情况①

02-27 14:44:05.971: I/MainActivity(10763): ------------> onPause()
02-27 14:44:06.511: I/MainActivity(10763): ------------> onStop()
02-27 14:44:09.591: I/MainActivity(10763): ------------> onStart()
02-27 14:44:09.591: I/MainActivity(10763): ------------> onResume()

情况②
02-27 14:46:24.831: I/MainActivity(10763): ------------> onPause()
02-27 14:46:27.351: I/MainActivity(10763): ------------> onStop()
02-27 14:47:04.721: I/MainActivity(11134): ------------> onCreate()
02-27 14:47:04.721: I/MainActivity(11134): ------------> onStart()
02-27 14:47:04.721: I/MainActivity(11134): ------------> onResume()

被遮挡出现了两种情况，一种是没有执行create()，另一种是执行了create()。估计执行create的这种情况是因为前端的这个程序对内存消耗较大，other application need memory Process is killed因此系统将前面的程序destroy了。

Figure 1 illustrates these loops and the paths an activity might take between states. The rectangles represent the callback methods you can implement to perform operations when the activity transitions between states.