从文件中读取inf时出错

Question

我尝试从文件中读取一些inf，所以我得到了readFromFile()，但是我的应用程序开始读取它时就会崩溃。这是readFromFile()：

private String readFromFile() {
    String ret = "";
    try {
        Log.w(TAG, "Start read");
        InputStream inputStream = openFileInput(filename);

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            int hnum = 1;
            while ( (receiveString = bufferedReader.readLine()) != null ) {
                Log.d(TAG, "hnum = " + hnum);
                stringBuilder.append(receiveString);
                if (hnum == 1) {num = Integer.valueOf(stringBuilder.toString());}
                if (hnum == 2) {sex = Integer.valueOf(stringBuilder.toString());}
                else { ret = stringBuilder.toString();}
                hnum = hnum + 1;
            }

            inputStream.close();
            ret = stringBuilder.toString();
            Log.i(TAG, "Ret = " + ret);
        }
    }
    catch (FileNotFoundException e) {
        Log.e(TAG, "File not found: " + e.toString());
        Toast.makeText(this, "Profile file not found", Toast.LENGTH_SHORT).show();
        num = 0;
        writeToFile(data);
    } catch (IOException e) {
        Log.e(TAG, "Can not read file: " + e.toString());
        Toast.makeText(this, "Can not read profile file", Toast.LENGTH_SHORT).show();
    }

    return ret;
}

和logcat：

W/Days﹕ Start read
D/Days﹕ hnum = 1

虚拟设备

App Days stopped

提前致谢， SergaRUS