android - ToggleButton makes mediaplayer play twice at once -

i have mediaplayer plays music in activity below. thing is, music transfers other activities , thats fine. when start music, go activity , come activity below, togglebutton has changed on off. therefore, if click on togglebutton, music starts again though music still playing music playing twice @ once! how make togglebutton know music playing when come activity, togglebutton "on" beginning? it's "off" default.

public class spelaactivity extends activity {  @override protected void oncreate (bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_spela);      final mediaplayer mediaplayer = mediaplayer.create(getbasecontext(), r.raw.ljudfil);      togglebutton musikknapp = (togglebutton) findviewbyid(r.id.togglemusik);     musikknapp.setoncheckedchangelistener (new compoundbutton.oncheckedchangelistener() {     public void oncheckedchanged(compoundbutton buttonview,             boolean ischecked) {         if (ischecked) {             mediaplayer.start();         } else {             mediaplayer.pause();         }     } });     mediaplayer.setoncompletionlistener(new oncompletionlistener() {         @override         public void oncompletion(mediaplayer mediaplayer) {             mediaplayer.release();         }     });  } } 

you need save togglebutton state. try code:

public class mainactivity extends activity {      private togglebutton togglebutton;     private static bundle bundle = new bundle();     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         togglebutton = (togglebutton)findviewbyid(r.id.togglebutton1);     }        @override     public void onpause() {         super.onpause();         bundle.putboolean("togglebuttonstate", togglebutton.ischecked());     }      @override     public void onresume() {         super.onresume();         togglebutton.setchecked(bundle.getboolean("togglebuttonstate",false));     }