Android Custom Camera Zoom Not Working -

i have seen several other questions on subject none seem solve problem. have custom camera app working fine, zoom buttons. code using sdk min 8 target 14:

@override         public void surfacechanged(surfaceholder holder, int format, int width,                 int height) {             if (ispreviewing){                  camera.stoppreview();              }              camera.parameters p = camera.getparameters();             p.setpreviewsize(sizes.get(0).width, sizes.get(0).height);             p.setcoloreffect(effect);               zoomcontrols = (zoomcontrols) findviewbyid(r.id.zoomcontrols);              if (p.iszoomsupported()) {                 maxzoomlevel = p.getmaxzoom();                 toast.maketext(picturetaker.this, string.valueof(maxzoomlevel),toast.length_long).show();                 zoomcontrols.setiszoominenabled(true);                 zoomcontrols.setiszoomoutenabled(true);                  zoomcontrols.setonzoominclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel < maxzoomlevel) {                             currentzoomlevel++;                             camera.startsmoothzoom(currentzoomlevel);                             //toast.maketext(picturetaker.this, string.valueof(currentzoomlevel),toast.length_long).show();                         }                     }                 });                  zoomcontrols.setonzoomoutclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel > 0) {                             currentzoomlevel--;                             camera.startsmoothzoom(currentzoomlevel);                         }                     }                 });             } else {                 zoomcontrols.setvisibility(view.gone);             }              camera.setparameters(p);               try {                 camera.setpreviewdisplay(holder);              } // end try             catch (ioexception e) {                 log.v(tag, e.tostring());             } // end catch              camera.startpreview(); // begin preview             ispreviewing = true;         } 

the setcoloreffect coming options menu , works perfectly. know iszoomsupported , getmaxzoom working because toast displays "59" when code runs, zoom buttons nothing. zoomcontrol xml

<zoomcontrols  android:id="@+id/zoomcontrols"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignparentbottom="true"  android:layout_centerhorizontal="true"  android:layout_marginbottom="17dp"  android:baselinealigned="false"  android:gravity="center_horizontal"  android:orientation="horizontal" /> 

i have necessary permissions in manifest , no errors showing in logcat. not sure i'm doing wrong. added second toast report if currentzoomlevel being changed when button pressed , shows value getting incremented 1 each time. tried not using startsmoothzoom , setting zoom

p.setzoom(currentzoomlevel); or p.setzoomlevel(15);  

and neither 1 works either. phone, htc incredible have working zoom on native camera app. if comment out zoomcontrol parts of code, works fine , other features of custom camera work fine zoomcontrol code in there, doesn't zoom.

figured out , maybe can of other people have been having similar problems. smoothzoom. guess htc doesn't support this.

@override         public void surfacechanged(surfaceholder holder, int format, int width,                 int height) {             if (ispreviewing){                  camera.stoppreview();              }              p = camera.getparameters();             p.setpreviewsize(sizes.get(0).width, sizes.get(0).height);             p.setcoloreffect(effect);                 if (p.iszoomsupported() && p.issmoothzoomsupported()) {                 //most phones                 maxzoomlevel = p.getmaxzoom();                  zoomcontrols.setiszoominenabled(true);                 zoomcontrols.setiszoomoutenabled(true);                  zoomcontrols.setonzoominclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel < maxzoomlevel) {                             currentzoomlevel++;                             camera.startsmoothzoom(currentzoomlevel);                          }                     }                 });                  zoomcontrols.setonzoomoutclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel > 0) {                             currentzoomlevel--;                             camera.startsmoothzoom(currentzoomlevel);                         }                     }                 });             } else if (p.iszoomsupported() && !p.issmoothzoomsupported()){                 //stupid htc phones                 maxzoomlevel = p.getmaxzoom();                  zoomcontrols.setiszoominenabled(true);                 zoomcontrols.setiszoomoutenabled(true);                  zoomcontrols.setonzoominclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel < maxzoomlevel) {                             currentzoomlevel++;                             p.setzoom(currentzoomlevel);                             camera.setparameters(p);                          }                     }                 });                  zoomcontrols.setonzoomoutclicklistener(new onclicklistener() {                     public void onclick(view v) {                         if (currentzoomlevel > 0) {                             currentzoomlevel--;                             p.setzoom(currentzoomlevel);                             camera.setparameters(p);                         }                     }                 });             }else{                 //no zoom on phone                 zoomcontrols.setvisibility(view.gone);             }              camera.setparameters(p);               try {                 camera.setpreviewdisplay(holder);              } // end try             catch (ioexception e) {                 log.v(tag, e.tostring());             } // end catch              camera.startpreview(); // begin preview             ispreviewing = true;         } // end method surfacechanged 

this lets htc zoom in steps. key setting camera's parameters after each button click. set currentzoomlevel number want, based on maxzoomlevel, (my htc 59 droid 4 15), during clicks of zoomcontrols make device zoom in , out faster. might tidier way code this, should put checks in make sure maxzoomsize doesn't return null or something, it's working on multiple devices.