java - Remove a specific line from a .txt file -

i'm trying remove specific line .txt file, stored on android phone. how i'm trying it:

public void removelinefrom (string filepath, string linetoremove){     try {           file oldfile = new file(filepath);           file tempfile = new file(externalstoragepath + file.separator + "/android/data/com.whizzappseasyvoicenotepad/temp file.txt");            bufferedreader br = new bufferedreader(new filereader(filepath));           printwriter pw = new printwriter(new filewriter(tempfile));            string line = null;            //read original file , write new           //unless content matches data removed.           while ((line = br.readline()) != null) {              if (!line.equals(linetoremove)) {                pw.write(line);               pw.flush();             }           }           pw.close();           br.close();            //delete original file           oldfile.delete();            //rename new file filename original file had.           tempfile.renameto(recordedfiles);          }         catch (filenotfoundexception ex) {           ex.printstacktrace();         }         catch (ioexception ex) {           ex.printstacktrace();         } } 

everytime call method this:

removelinefrom(externalstoragepath + file.separator +      "/android/data/com.whizzappseasyvoicenotepad/recorded files.txt",      recordedfilesarray.get(todelete)); 

the app crashes. logcat error:

08-08 15:24:22.225: e/androidruntime(6146): java.lang.indexoutofboundsexception:      invalid index 1, size 1 

it says problem in line posted above (calling method). don't know why index invalid. todelete variable:

todelete = arg2; 

whole onitemlongclick if needs:

listview.setonitemlongclicklistener(new onitemlongclicklistener(){          @override         public boolean onitemlongclick(adapterview<?> arg0, view arg1,                 int arg2, long arg3) {             deletealert.settitle("warning");             deletealert.setmessage("are sure want delete this?");             todelete = arg2;             deletealert.setpositivebutton("yes", new dialoginterface.onclicklistener() {                  @override                 public void onclick(dialoginterface dialog, int which) {                     file directory = new file (externalstoragepath + file.separator + "android/data/com.whizzappseasyvoicenotepad/");                     file deletefile = new file (directory, recordedfilesarray.get(todelete) + ".mp3");                     deletefile.delete();                     log.i("tag", "deleting file: " + directory + recordedfilesarray.get(todelete) + ".mp3");                      listadapter.remove(listadapter.getitem(todelete));                     listadapter.notifydatasetchanged();                      removelinefrom(externalstoragepath + file.separator + "/android/data/com.whizzappseasyvoicenotepad/recorded files.txt", recordedfilesarray.get(todelete));                      toast toast = toast.maketext(getapplicationcontext(), "deleted", toast.length_short);                     toast.show();                      dialog.dismiss();                 }             });              deletealert.setnegativebutton("no", null);             deletealert.show();             return false;         }      }); 

the problem here:

listadapter.remove(listadapter.getitem(todelete)); listadapter.notifydatasetchanged();  removelinefrom(externalstoragepath + file.separator + "/android/data/com.whizzappseasyvoicenotepad/recorded files.txt", recordedfilesarray.get(todelete)); 

you removing arg2 array, before call method, that's why when call method, arg2 (todelete) doesn't exist anymore. make work, call method (removelinefrom) before removing item listadapter.