android - CWAC CAMERA-switching Front-Back camera not working -

i have integrated [cwac-camera][1].i trying switch between , front camera clicking on button using below code not working.i can see default camera.where going wrong?

     private boolean isbackcam=true;      f = new camerafragment();         builder=new simplecamerahost.builder(new democamerahost(getapplicationcontext())); f.sethost(builder.usefullbleedpreview(true).build());          handleswitchcamera=(imagebutton)findviewbyid(r.id.handleswitchcamera);           handleswitchcamera.setonclicklistener(new view.onclicklistener()                 {                     @override                     public void onclick(view view)                  {                       if(isbackcam)                          {                             isbackcam=false;                             builder.usefrontfacingcamera(true);                         }                         else                         {                             isbackcam=true;                             builder.usefrontfacingcamera(false);                         }                     }                 }); 

updated according commonsware answer-

 f = new camerafragment();         getfragmentmanager().begintransaction()                 .add(r.id.preview_view, f, tag_camera_fragment)                 .commit();         f2 = new camerafragment();      builder=new simplecamerahost.builder(new democamerahost(getapplicationcontext()));         builder2=new simplecamerahost.builder(new democamerahost(getapplicationcontext()));         builder.usefrontfacingcamera(false);         builder2.usefrontfacingcamera(true);         f.sethost(builder.usefullbleedpreview(true).build());         f2.sethost(builder2.usefullbleedpreview(true).build()); handleswitchcamera.setonclicklistener(new view.onclicklistener()     {         @override         public void onclick(view view) {             if(isbackcam) {                 log.e("bhuvnesh","backcam");                 isbackcam=false;                   getfragmentmanager().begintransaction()                         .replace(r.id.preview_view, f2, tag_camera_fragment)                         .commit();             }             else             {                 log.e("bhuvnesh","frontcam");                 isbackcam=true;                   getfragmentmanager().begintransaction()                         .replace(r.id.preview_view, f, tag_camera_fragment)                         .commit();             }         }     });   [1]: https://github.com/commonsguy/cwac-camera 

you need call sethost() after configuring builder. cannot change builder later on , expect change.

note sethost() designed called once per fragment. if want switch between cameras, need switch fragments (one per camera), demo app does.