android - Cannot find the file -

i'm experiencing trouble open file. i've used absolute path know file still cant open file (file not found)

    public void readfromfile() throws filenotfoundexception  {        /** read contents of given file. */            string sourceid = new string();          string logicalid = new string();           file filedir = getfilesdir();          string s = new string();           s+=filedir.getabsolutepath()+"/nodes.txt";          scanner scanner = new scanner(new fileinputstream(s));            try           {              while (scanner.hasnextline())               {                   sourceid = scanner.nextline();                   logicalid = scanner.nextline();                   string ss = new string();                 ss+="    ----------------> "+sourceid+" "+logicalid+"   ";                  log.v(tag, ss);                 listanodesstart.add(new nodestostart(sourceid,logicalid));             }           }catch(exception ee){//log.v(tag, "could not read file");                error.settext("could not read file nodes.txt");          errorlog.settext("could not read file nodes.txt");}           finally{scanner.close(); }      } 

i guess problem device hasn't file, but, how can upload when app starts?

thanks in advance

as mentioned, have no file in device! work static files, insert them in assets folder , then:

assetmanager assetmanager = getassets(); string[] files = null; try {     files = assetmanager.list(""); } catch (ioexception e) {     log.d("tag", e.getmessage()); } for(string filename : files) {      if( filename.equals("nodes.txt") {         inputstream in = null;         try {             // work file             in = assetmanager.open(filename);             // ...         } catch(exception e) {             log.e("tag", e.getmessage());         }     } }