Error on Call on state 4 Xamarin.android MediaPlayer -

i try play music stream url, have code

class audioimplementation : isound { private mediaplayer mediaplayer;  public audioimplementation() { }  public context applicationcontext { get; private set; }  public void initializer() {     mediaplayer = new mediaplayer();     mediaplayer.setaudiostreamtype(stream.music);      }  public void play(string aux) {     if (mediaplayer == null)     {         initializer();     }     try     {         mediaplayer.setdatasource(aux);         mediaplayer.prepare();         mediaplayer.start();     }     catch (exception ex)     {         //unable start playback log error         console.writeline("unable start playback: " + ex);     }   } } 

but getting error start called in state 4, mplayer error. can please me or point me in right direction?

you set ionpreparedlistener mediaplayer, start() method called after mediaplayer prepared. code :

 mediaplayer.setdatasource(aux);  mediaplayer.prepare();  mediaplayer.setonpreparedlistener(new mylistener(this));   class mylistener : java.lang.object, mediaplayer.ionpreparedlistener  {      private audioimplementation audioimplementation;       public mylistener(audioimplementation audioimplementation)      {          this.audioimplementation = audioimplementation;      }       public void onprepared(mediaplayer mp)      {          audioimplementation.mediaplayer.start();      }  }