Android studio camera parameters -

i made camera app need add area on surfaceview camera capture part of hole surfaceview, qr code surface view when have squar area put qr code in camera. here code

        private camerasource camerasource;         private surfaceview cameraview;         @override       protected void oncreate(bundle savedinstancestate) {       super.oncreate(savedinstancestate);        setcontentview(r.layout.activity_main);         cameraview = (surfaceview) findviewbyid(r.id.surface_view);        textblockcontent = (textview) findviewbyid(r.id.text_value);            camerasource = new camerasource.builder(getapplicationcontext(),                  textrecognizer)             .setfacing(camerasource.camera_facing_back)             .setrequestedpreviewsize(1280, 1024)             .setrequestedfps(2.0f)             .setautofocusenabled(true)             .build();        cameraview.getholder().addcallback(new surfaceholder.callback() {         @override         public void surfacecreated(surfaceholder holder) {             try {                 //noinspection missingpermission                 camerasource.start(cameraview.getholder());             } catch (ioexception ex) {                 ex.printstacktrace();             }         }          @override         public void surfacechanged(surfaceholder holder, int format, int          width, int height) {          }          @override         public void surfacedestroyed(surfaceholder holder) {             camerasource.stop();         }     });  }