启动程序时:onCreate-->onStart-->onResume
Back键,结束程序:onSaveInstanceState-->onPause-->onStop-->onDestroy
当前Activity进入下一个Activity:onSaveInstanceState-->onPause-->onStop,程序没有销毁
Home键:onSaveInstanceState-->onPause-->onStop,程序没有销毁
再次启动:onRestart-->onStart-->onResume
当前Activity锁屏:onSaveInstanceState-->onPause,程序没有销毁