input - Android: Read String from file -

i having trouble reading string ".txt" file on external storage. method created not working program , need it

private string readfromfile() {  string ret = "";  try {  final file configdir = new file(environment.getexternalstoragedirectory(), "config");      configdir.mkdir();      inputstream inputstream = openfileinput(new file(configdir, "url.txt"));      if ( inputstream != null ) {         inputstreamreader inputstreamreader = new inputstreamreader(inputstream);         bufferedreader bufferedreader = new bufferedreader(inputstreamreader);         string receivestring = "";         stringbuilder stringbuilder = new stringbuilder();          while ( (receivestring = bufferedreader.readline()) != null ) {             stringbuilder.append(receivestring);         }          inputstream.close();         ret = stringbuilder.tostring();     } } catch (filenotfoundexception e) {     log.e("login activity", "file not found: " + e.tostring()); } catch (ioexception e) {     log.e("login activity", "can not read file: " + e.tostring()); }  return ret; } 

i not know how solve , method work program. great if of me.

use filereader instead of inputstreamreader , correct configdir creation below...

try {      final file configdir = new file(environment.getexternalstoragedirectory() + "/config");      configdir.mkdir();      file file = new file(configdir, "url.txt");      if ( inputstream != null ) {          bufferedreader bufferedreader = new bufferedreader(new filereader(file));         string receivestring = "";         stringbuilder stringbuilder = new stringbuilder();          while ( (receivestring = bufferedreader.readline()) != null ) {             stringbuilder.append(receivestring);         }          inputstream.close();         ret = stringbuilder.tostring();     } } catch (filenotfoundexception e) {     log.e("login activity", "file not found: " + e.tostring()); } catch (ioexception e) {     log.e("login activity", "can not read file: " + e.tostring()); }