java - MediaPlayer plays double sounds on change orientation -


i have big problem app. problem when orientation changes landscape , change portrait music twice tracks plays @ same time. when start app on portrait have no problem it. 

package com.phone.sensor;  import android.app.activity; import android.hardware.sensor; import android.hardware.sensorevent; import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.media.mediaplayer; import android.os.bundle; import android.view.menu; import android.widget.textview;  public class sensoractivity extends activity implements sensoreventlistener{     public boolean musstatus = false;     public boolean musdeclare = true;     public mediaplayer mp = null;      sensor accelerometer;     sensormanager sm;     textview acceleration;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         if(savedinstancestate == null){             if(mp != null){                 mp.stop();                 mp.reset();                 mp = null;             }         } else {             if(mp != null){                 mp.stop();                 mp.reset();                 mp = null;             }         }         setcontentview(r.layout.activity_main);         sm=(sensormanager) getsystemservice(sensor_service);         accelerometer=sm.getdefaultsensor(sensor.type_accelerometer);         sm.registerlistener(this, accelerometer, sensormanager.sensor_delay_normal);          acceleration=(textview)findviewbyid(r.id.acceleration);     }       @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }       @override     public void onaccuracychanged(sensor sensor, int accuracy) {         // todo auto-generated method stub      }      @override     public void onsaveinstancestate (bundle outstate)     {         super.onsaveinstancestate(outstate);         outstate.putboolean("musstatus", musstatus);         outstate.putboolean("musdeclare", musdeclare);     }      public object onretaincustomnonconfigurationinstance() {         return this.mp;     }      @override     public void onsensorchanged(sensorevent event) {         // todo auto-generated method stub         acceleration.settext("x: "+event.values[0]+                 "\ny: "+event.values[1]+                 "\nz: "+event.values[2]);          float x = event.values[0];         float y = event.values[1];         float z = event.values[2];          if(y > 8.9) {                if(musdeclare == true)             {                 mp = mediaplayer.create(this, r.raw.alexander);                 musdeclare = false;             }              if(musstatus == false)             {                 mp.start();                 musstatus = true;             }         }          if(y < 5)         {             if(musstatus == true)             {                 mp.stop();                 mp.reset();                 mp = null;                 musstatus = false;                 musdeclare = true;             }         }     } }

try putting block of code in onpause method of class

      if(mp != null && mp.isplaying()){             mp.stop();             mp.reset();             mp = null;         }     }

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