How to check file internal storage android?

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Mobile

Android

I have a file : language.txt use internal storage. I want to read file to a string and check this string to choose database.

This is my code:

public class DBDAO {
	protected SQLiteDatabase database;
	private DatabaseHelper dbHelper;
	private DataBaseHelper_FR dbHelper_FR;
	private Context mContext;
public DBDAO(Context context) {
        this.mContext = context;
        dbHelper = new DatabaseHelper(mContext);
        open();
    }

public void open() throws SQLException {

		if(fileExists(mContext, "language.txt"))
		{
			lang = main.ReadFile();
		}
		else
		{
			main.WriteFile("English");
			lang = "English";
		}
		if (lang == "English") {
			if (dbHelper == null)
				dbHelper = new DatabaseHelper(mContext);
			database = dbHelper.getWritableDatabase();
		}

		else if (lang == "France") {
			if (dbHelper_FR == null)
				dbHelper_FR = new DataBaseHelper_FR(mContext);
			database = dbHelper_FR.getWritableDatabase();
		}
	}
	public boolean fileExists(Context context, String filename) {
		File file = context.getFileStreamPath(filename);
		if (file == null || !file.exists()) {
			return false;
		}
		return true;
	}
	
	// write text to file
		public void WriteFile(String writeString) {
			// add-write text into file
			try {
				FileOutputStream fileout = mContext.openFileOutput("language.txt", mContext.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 = mContext.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;
		}
}

Where is my faults?
Thank so much.