explain the seekbar listener in android -

in below please explain parameters passed listeners.that in sbar1.setonseekbarchangelistener(new seekbar.onseekbarchangelistener()). thank you

package com.example.centum.seekbar;      import android.support.v7.app.appcompatactivity;     import android.os.bundle;     import android.widget.edittext;     import android.widget.seekbar;      public class mainactivity extends appcompatactivity {          edittext etext1;         seekbar sbar1;         @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_main);             etext1=(edittext)findviewbyid(r.id.et2);             sbar1=(seekbar)findviewbyid(r.id.sb2);             sbar1.setonseekbarchangelistener(new seekbar.onseekbarchangelistener() {                 @override                 public void onprogresschanged(seekbar seekbar, int i, boolean b) {                     etext1.settextsize(i*5);                 }                  @override                 public void onstarttrackingtouch(seekbar seekbar) {                  }                  @override                 public void onstoptrackingtouch(seekbar seekbar) {                  }             });         }     } 

the javadoc onseekbarchangelistener might understand

     /**      * notification progress level has changed. clients can use fromuser parameter      * distinguish user-initiated changes occurred programmatically.      *      * @param seekbar seekbar progress has changed      * @param progress current progress level. in range 0..max max      *        set {@link progressbar#setmax(int)}. (the default value max 100.)      * @param fromuser true if progress change initiated user.      */     void onprogresschanged(seekbar seekbar, int progress, boolean fromuser);      /**      * notification user has started touch gesture. clients may want use      * disable advancing seekbar.      * @param seekbar seekbar in touch gesture began      */     void onstarttrackingtouch(seekbar seekbar);      /**      * notification user has finished touch gesture. clients may want use      * re-enable advancing seekbar.      * @param seekbar seekbar in touch gesture began      */     void onstoptrackingtouch(seekbar seekbar);