how to use internal Storage in DatabaseHelper?

I want to use internal storage (opennFileOutput) in database helper. This is my code:

public class DBDAO {
    protected SQLiteDatabase database;
    private DatabaseHelper dbHelper;
    private Context mContext;

    public DBDAO(Context context) {
        this.mContext = context;
        dbHelper = new DatabaseHelper(mContext);
    }
    public void WriteFile(String writeString) {
        // add-write text into file
        try {
            FileOutputStream fileout = openFileOutput("language.txt", MODE_PRIVATE);
            OutputStreamWriter outputWriter = new OutputStreamWriter(fileout);
            outputWriter.write(writeString);
            outputWriter.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
// Read text from file
    public String ReadFile() {
        // reading text from file
        String s = "";
        try {
            FileInputStream fileIn = openFileInput("language.txt");
            InputStreamReader InputRead = new InputStreamReader(fileIn);
            char[] inputBuffer = new char[100];
            int charRead;
            while ((charRead = InputRead.read(inputBuffer)) > 0) {
                // char to string conversion
                String readstring = String
                        .copyValueOf(inputBuffer, 0, charRead);
                s += readstring;
            }
            InputRead.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return s;
    }
}

But, error in: OpenFileOutput : MODE_PRIVATE cannot be resolved to a variable

and: The method openFileInput(String) is undefined for the type DBDAO

So somebody can show me how to solve it?

Thanks so much and sorry because my english.