Life cycle interaction of multiple activity for Android notes

Single activity:

Invoke when application is open: OnCreate (), OnStart (), Onresume ();

Press the back key: OnPause (), OnStop (), ondestory ();

When interacting between multiple activity:

To jump to a second activity:

Firstactivity	Secondactivity
OnPause ()
	OnCreate ()
	OnStart ()
	Onresume ()
OnStop ()

Press the lock screen key

Secondactivity

OnPause ()

OnStop ()

Unlock

Secondactivity

Onrestart ()

OnStart ()

Onresume ()

Press the back key, or Secondactivity call finish ()

Firstactivity	Secondactivity
	OnPause ()
Onrestart ()
OnStart ()
Onresume ()
	OnStop ()
	Ondestory ()

Life Cycle Application Examples

Play Music in activity

OnCreate ():

1     PrivateMediaPlayer MediaPlayer;2 @Override3     protected voidonCreate (Bundle savedinstancestate) {4         Super. OnCreate (savedinstancestate);5 Setcontentview (r.layout.activity_main);6LOG.I ("Imformation", "Mainactivity oncreate!");7Mediaplayer=mediaplayer.create ( This, r.raw.quite);8 Mediaplayer.start ();9         Ten}

Music also needs to be paused while activity OnPause

At this point, you need a variable where the record is played: private int place;

OnPause:

1 @Override2     protected voidOnPause () {3     //TODO auto-generated Method Stub4     Super. OnPause ();5     if(Mediaplayer.isplaying ())6     {7 mediaplayer.pause ();8Place=mediaplayer.getcurrentposition ();9         Ten     } OneLOG.I ("Imformation", "Mainactivity onpause!"); A}

Similarly, when the activity is resume, the music will be played

Onresume:

1 @Override2     protected voidOnresume () {3     //TODO auto-generated Method Stub4     Super. Onresume ();5     if(place!=0)6     {7 Mediaplayer.seekto (place);8 Mediaplayer.start ();9     }TenLOG.I ("Imformation", "Mainactivity onresume!"); One}

The music player is destroyed when the activity is destroyed.

1 @Override2     protected voidOnDestroy () {3         //TODO auto-generated Method Stub4         Super. OnDestroy ();5             if(mediaplayer!=NULL){6 mediaplayer.release ();7Mediaplayer=NULL;8                  }9LOG.I ("Imformation", "Mainactivity ondestory!");Ten}

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Life cycle interaction of multiple activity for Android notes