程式執行：onCreate()->onStart()->onResume()

按home鍵：onPause()->onSaveInstanceState()->onStop()

 然後點程式圖示進入觸發：onRestart()->onStrart()->onResume()

按返回鍵：onPause()->onStop()->onDestroy()

 然後點程式圖示進入觸發：onCreate()->onStart()->onResume()

啟動第二個Activity:onPause()->second onCreate()->second onStart()->second onResume()

->onSaveInstanceState()->onStop()(其中second 指的是第二個Activity的生命週期)

然後點返回鍵回到第一個Activity:second onPause()->onRestart()->onStrart()->onResume()

->second onStop()->second onDestroy()

橫豎屏切換：

1）當清單檔案androidManifest.xml不新增Android：configchanges時 或者 新增android:configChanges="orientation" 或者 新增android:configChanges="orientation|keyboardHidden"時，橫屏切換成豎屏、豎屏切換成橫屏都是觸發一次：

 onPasue()->onSaveInstanceState()->onStop()->onDestroy()->onCreate()->onStrart()->onRestoreInstanceState()->OnResume()

       2)當清單檔案androidManifest.xml新增android:configChanges="orientation|screenSize"時

橫屏切換成豎屏、豎屏切換成橫屏都是觸發一次：onConfigurationChanged