(1)创建:onCreate->onStart->onResume;
(2)失去焦点:onPause->onStop:
(3)重新获得焦点:onRestart->onStart->onResume;
(4)退出:onPause->onStop->onDestory
(1)创建:onCreate->onStart->onResume;
(2)失去焦点:onPause->onStop:
(3)重新获得焦点:onRestart->onStart->onResume;
(4)退出:onPause->onStop->onDestory