java - Implementing a Gallery with pinch zoom -

i have gallery of images , i'm trying enable pinch zoom on it. separately, work fine. problem is, can't life of me bind 2 of them together! tried bind imagezoomview in imageadapter, no avail. should try doing when user clicks image? have other ideas? code in imageadapter.class returns gallery elements:

    public view getview(int position, view convertview, viewgroup parent) {      imageview = new imageview(mcontext);     bitmap bitmap = bitmapfactory.decoderesource(mcontext.getresources(),mimageids[position]);     i.setlayoutparams(new gallery.layoutparams(300, 450));     i.setscaletype(imageview.scaletype.fit_xy);     i.setbackgroundresource(mgalleryitembackground);     i.setimagebitmap(bitmap);     return i; } 

and how handle in mainactivity.class:

    public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.gallery);          gallery g = (gallery) findviewbyid(r.id.gallery);         g.setadapter(new imageadapter(this));          log.i("blah","e ok");          g.setonitemclicklistener(new onitemclicklistener() {             public void onitemclick(adapterview<?> parent, view v, int position, long id) {     //            mbitmap = imageadapter.mimageids[position];     //               mzoomview = (imagezoomview)findviewbyid(r.id.zoomview);  //               mzoomview.setzoomstate(mzoomcontrol.getzoomstate());  //               mzoomview.setimage(mbitmap);    //               toast.maketext(mainactivity.this, "" + position, toast.length_short).show();             }         }); 

as can see, tried something, app crashes. :( here appreciated.

you should create imagezoomview in getview method, assuming imagezoomview widget of own subclassing imageview widget.