Activitiy生命周期

 onCreate()  -->  onStart()-->    onResume()    onRestart()      
                                                             |
 onDestroy()    <--- onStop()  <---onPause()
 

 

 

禁用横竖屏切换的生命周期   

  android:screenOrientation="portrait"

android:configChanges="keyboardHidden|orientation"