How to create a Photo Gallery on Android? -

i want create photo gallery on android. i'm using gallery , baseadapter create scrollable gallery. want add action when image of gallery shown (each image's width same screen width), need index in image array. question how index of image shows on screen?

i want index of image shows on screen, not on click event. i've tried current image position in getview(), result strange:

i scroll image02 position=2 (should 1). when scroll back, image02's position=0 (should 1).

public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);                 gallery g = (gallery) this.findviewbyid(r.id.gallery);           g.setadapter(new imageadapter(this)); }  public class imageadapter extends baseadapter {        private context mcontext;       private integer[] mimageids = {               //each image's size 320x60             r.drawable.btm01,               r.drawable.btm02,               r.drawable.btm03     };       public imageadapter(context c){           this.mcontext = c;       }     @override     public int getcount() {         // todo auto-generated method stub         return mimageids.length;     }     @override     public object getitem(int position) {         // todo auto-generated method stub         return null;     }     @override     public long getitemid(int position) {         // todo auto-generated method stub         return 0;     }     @override     public view getview(int position, view convertview, viewgroup parent) {         // todo auto-generated method stub         imageview imageview = new imageview(mcontext);           imageview.setimageresource(mimageids[position]);           imageview.setlayoutparams(new gallery.layoutparams(320,60));             return imageview;       } 

check this example.

// reference gallery view gallery g = (gallery) this.findviewbyid(r.id.gallery);   // set adapter our custom adapter (below) g.setadapter(new imageadapter(this));  // set item click listener, , toast clicked position g.setonitemclicklistener(new onitemclicklistener() {   public void onitemclick(adapterview parent, view v, int position, long id) {     toast.maketext(gallery1.this, "" + position, toast.length_short).show();   } });