basics of android activity life cycle functions -

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i testing out code shows state activity in 

public class activity101activity extends activity {     string tag  =  "lifecycle";     /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         // setcontentview(r.layout.main);         setcontentview(r.layout.activity_activity101);         log.d(tag , "in oncreate() event");     }     public void onstart()     {         super.onstart();         log.d(tag , "in onstart() event");     }      public void onrestart()     {          super.onrestart();         log.d(tag , "in onrestart() event");     }      public void onresume()     {          super.onresume();         log.d(tag , "in onresume() event");     }      public void onpause()     {          super.onpause();         log.d(tag , "in onpause() event");     }      public void onstop()     {          super.onstop();         log.d(tag , "in onstop() event" );     }      public void ondestroy()     {          super.ondestroy();         log.d(tag , "in ondestroy() event");     } }

so see ondestroy() called when press button while activity on screen, , never called otherwise. should running in ground if press home button while activity running. however, if go settings -> apps -> running can't see on list. mean running in background or not?

again, again, code shows onpause() followed onstop() , onstart() followed onresume(). why defined different functions in android environment , not combined?

once activity goes in backstack, in suspended mode. dont see in running app list. once relaunch such suspended application, comes foreground backstack , starts run. kept in backstack preserve state , resume place got stopped before going in background.

to understand why, onstart needed before onresume follow link below. clear doubts clearly:

difference between onstart() , onresume()


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