java - why not display two picture in text? -


when type s in text1 corresponding picture appears in text2 when type g in text1 corresponding picture shown in text2, previous picture of s shown letter instead of picture. why that? why can't display 2 pictures? what's wrong?

public class mainactivity extends activity {        @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          final edittext te1 = (edittext)findviewbyid(r.id.t1);          final edittext te2 = (edittext)findviewbyid(r.id.t2);             final button v = (button)findviewbyid(r.id.b1);           v.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                       //imva.setimageresource(r.id.b1);                  te2.settext(" ");                  string t= te1.gettext().tostring();                  char [] aa = t.tostring().tochararray();                    (int = 0 ; < aa.length ; i++)                   {                       if (aa[i] == 's')                       {                      spannablestringbuilder builder = new spannablestringbuilder(te1.gettext());                       {                 imagespan imagespan = new imagespan(getbasecontext(),r.drawable.a1);                   int pos = builder.tostring().indexof("s");                 builder.replace(pos, pos + 1, "$");                  builder.setspan(imagespan, pos, pos + 1,spannable.span_exclusive_exclusive);               } while (builder.tostring().indexof("s") > -1);                     te2.settext(builder);                        }                       if (aa[i] == 'g')                     {                             spannablestringbuilder builder = new spannablestringbuilder(te1.gettext());                      {                     imagespan imagespan = new imagespan(getbasecontext(),r.drawable.a2);                       int pos = builder.tostring().indexof("g");                     builder.replace(pos, pos+ 1, "$");                  builder.setspan(imagespan, pos, pos + 1,spannable.span_exclusive_exclusive);               } while (builder.tostring().indexof("g") > -1);                 te2.settext(builder);                        }                     }


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