خواندن فایل متن/حل شد

برای نوشتن متن فارسی میتونی از کد های زیر استفاده کنی

StringBuilder result = new StringBuilder();
                BufferedReader bfrr = null;
                try {
                    FileInputStream in = openFileInput("sm");///sm نام فایل متنیه
                    bfrr = new BufferedReader(new InputStreamReader(in, "UTF-8"));
                    String line;

                    while ((line = bfrr.readLine()) != null)
                    {
                        //  Long.parseLong();

                        result.append(line + "\r\n");
                    }

                    txtr.setText(result.toString()); /// واسه نمایش دادن متن

                }
                catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } finally
                {
                    try {
                        bfrr.close();
                    }
                    catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

برای خواندن از فایل هم تقریبا مثل نوشتنه

   BufferedWriter bfrw = null;
                try {
                    FileOutputStream out = openFileOutput("sm", Context.MODE_PRIVATE);//نام فایلی که در کد های قبل ایجاد کردیم
                    bfrw = new BufferedWriter(new OutputStreamWriter(out, "UTF-8"));
                    bfrw.write(edt.getText().toString());///edt نام edittext برای دریافت متن
                }
                catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } finally
                {
                    try {
                        bfrw.close();
                    }
                    catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }