android - Java StringWriter StringBuilder exception at toString -

ok.. totally weird. i'm trying make http request in android. works , can 'build' string using stringwriter code throws exception @ writer.tostring(). makes no difference if use stringbuilder or stringwriter.

try {     httpresponse response = httpclient.execute(httppost);     inputstream = response.getentity().getcontent();     stringbuilder writer = new stringbuilder();     //stringwriter writer = new stringwriter();     int ch;     while(( ch = is.read()) != -1) {          writer.append((char)ch);     }     string thestring = writer.tostring();     return thestring; }  catch (exception e) {     return e.getmessage(); } 

any ideas?

the problem http thread attempting update ui thread httpresponse in textview or other such ui element calledfromwrongthreadexception being raised.

using handler or other such mechanism redirect ui thread ui update solve problem.