Zoom Control in Camera is not working in Android -

i working on custom camera using surface view in application, recording video screen capture.

i looking implement zoom control in camera code not getting success.

getting log while zooming:

e/adreno200-es20(12756): <qgl2drvapi_glbuffersubdata:709>: gl_invalid_operation 

i using below code:

/** * setzoomcontrol * @param params */

public void setzoomcontrol(camera.parameters params) {     paramtrs = params;     zoomcontrols zoomcontrols = (zoomcontrols) findviewbyid(r.id.zoomcontrols);      if (params.iszoomsupported()) {         final int maxzoomlevel = paramtrs.getmaxzoom();         log.i("max zoom ", "is " + maxzoomlevel);          zoomcontrols.setiszoominenabled(true);         zoomcontrols.setiszoomoutenabled(true);          zoomcontrols.setonzoominclicklistener(new onclicklistener() {             public void onclick(view v) {                 int currentzoomlevel = 0;                 if (currentzoomlevel < maxzoomlevel) {                     currentzoomlevel++;                     camera.startsmoothzoom(currentzoomlevel);                 }             }         });          zoomcontrols.setonzoomoutclicklistener(new onclicklistener() {             public void onclick(view v) {                 int currentzoomlevel = 0;                 if (currentzoomlevel > 0) {                     currentzoomlevel--;                     camera.startsmoothzoom(currentzoomlevel);                 }             }         });     } else         zoomcontrols.setvisibility(view.gone); } 

please suggest me whats happening in code.

you can use code

if (params.iszoomsupported()) {         final int maxzoomlevel = params.getmaxzoom();         log.i("max zoom ", "is " + maxzoomlevel);         zoomcontrols.setiszoominenabled(true);         zoomcontrols.setiszoomoutenabled(true);          zoomcontrols.setonzoominclicklistener(new onclicklistener(){             public void onclick(view v){                 if(currentzoomlevel < maxzoomlevel){                     currentzoomlevel++;                     //mcamera.startsmoothzoom(currentzoomlevel);                     params.setzoom(currentzoomlevel);                     mcamera.setparameters(params);                 }             }         });          zoomcontrols.setonzoomoutclicklistener(new onclicklistener(){             public void onclick(view v){                 if(currentzoomlevel > 0){                     currentzoomlevel--;                     params.setzoom(currentzoomlevel);                     mcamera.setparameters(params);                 }             }         });         }     else         zoomcontrols.setvisibility(view.gone);