現有兩個Activity: Activity1,Activity2
先啟動Activity1運行順序為： Activity1 onCreate -> Activity1 onStart -> Activity1 onResume
用Intent從Activity1跳到Activity2運行順序 ：
Activity1 onPause -> Activity2 onCreate -> Activity2 onStart -> Activity2 onResume ->Activity1 onStop -> Activity1 onDestroy
退出應用程序： Activity2 onResume ->Activity2 onStop -> Activity2 onDestroy