Android 動作 事件呼叫

1. MainActivity進入別的Activity
or Home button
 or multi-app(square) button

onPause
onStop

2.由別的Activity回去MainActivity
  or Home button 離開後再回去
or multi-app button 離開後再回去

onResume

3.MainActivity按back button
onPause
onStop
onDestroy
onBackPressed

4.曾經開啟過App,離開後,再重新進入MainActivity
onResume
shouldDisplayHomeUp
onCreate