باز نشدن DB

سلام . دیتابیس من باز نمی شه. باید چیکار کنم؟؟؟

 

public class database extends SQLiteOpenHelper {

    //path for saving DB
    public final String   path = "data/data/mohammadi.as/databases/";
    public final String   Name = "database";
    public SQLiteDatabase mydb;
    private final Context mycontext;


    public database(Context context) {
        super(context, "database", null, 1);
        mycontext = context;
    }


    @Override
    public void onCreate(SQLiteDatabase arg0) {

    }


    @Override
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {

    }


    public void useable() {
        boolean checkdb = checkdb();
        if (checkdb) {
            Log.i("log", "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<" + checkdb);

        } else {
            this.getReadableDatabase();
            try {
                copydatabase();
            }
            catch (IOException e) {

            }
        }
    }


    public void open() {
        mydb = SQLiteDatabase.openDatabase(path + Name, null, SQLiteDatabase.OPEN_READONLY);
    }


    @Override
    public void close() {
        mydb.close();
    }


    public boolean checkdb() {
        SQLiteDatabase db = null;
        try {
            db = SQLiteDatabase.openDatabase(path + Name, null, SQLiteDatabase.OPEN_READONLY);
            Log.i("log", "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<1" + db);
        }
        catch (SQLException e) {

        }
        Log.i("log", "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<ddd" + db);
        return db != null ? true : false;
    }


    public void copydatabase() throws IOException {

        OutputStream myOutput = new FileOutputStream(path + Name);
        byte[] buffer = new byte[1024];
        int lenght;
        InputStream myInput = mycontext.getAssets().open(Name);
        while ((lenght = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, lenght);
        }
        myInput.close();
        myOutput.flush();
        myOutput.close();

    }


    public String Display(int row, String table) {
        Log.i("Log", ">>>>>>>>>>>>>>>>>>>>..." + table);
        Cursor cursor = mydb.rawQuery("SELECT * FROM " + table, null);
        cursor.moveToPosition(row);
        String s = cursor.getString(4);
        return s;
    }


    public String namayesh(int row, int field, String table) {

        Cursor curser = mydb.rawQuery("SELECT * FROM " + table, null);
        curser.moveToPosition(row);
        String str = curser.getString(field);

        return str;
    }


    public Integer counting_field(String table, String feild) {
        Cursor curser = mydb.rawQuery("SELECT * FROM " + table + " group by " + feild, null);
        int i = curser.getCount();
        return i;
    }


    public Integer story_counter(String table, String seasone) {

        Cursor curser = mydb.rawQuery("SELECT * FROM contents", null);
        int i = curser.getCount();
        return i;

    }
}