how to handle two databases resides in assets folder in android or android suppports db of FILE format

How do I handle two different databases in android which in assets folder?or does android works on database having FILE format?I tries this code but getting no Parent_Category is found? After using Assets class i didn't succeed so i place my initial codes snippets.

DatabaseHandler File

public class DatabaseHandler extends SQLiteOpenHelper {

    public static final String TAG = "DatabaseHandler";

    private SQLiteDatabase db;
    private Context activity;
    String mydate;
    SharedPreferences  sh_Pref;
    private String prefName = "MyPref";
    String iname="no";
     private String DB_PATH = "/data/data/com.pstalk" + "/databases/";
    private static String DB_NAME = "state.sqlite";

    public DatabaseHandler(Context context) throws IOException {
        super(context, DB_NAME, null, 1);
        this.activity = context;
        boolean dbexist = checkdatabase();
        if (dbexist) {
            Log.d("Trong", "Database exists");
            opendatabase();
        } else {
            System.out.println("Database doesn't exist");
            createdatabase();
        }
    }

    public DatabaseHandler(Activity mActivity, String idns)throws IOException  {
        // TODO Auto-generated constructor stub
        super(mActivity, DB_NAME, null, 1);
        this.iname = idns;
        boolean dbexist = checkdatabase();
        if (dbexist) {
            Log.d("Trong", "Database exists");
            opendatabase();
        } else {
            System.out.println("Database doesn't exist");
            createdatabase();
        }
    }

    public void createdatabase() throws IOException {
        boolean dbexist = checkdatabase();
        if (dbexist) {
            // System.out.println(" Database exists.");
        } else {
            this.getReadableDatabase();
            try {
                copydatabase(); 

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private boolean checkdatabase() {
        // SQLiteDatabase checkdb = null;
        boolean checkdb = false;
        try {
            String myPath = DB_PATH + DB_NAME;
            Log.d("Trong", "DB_PATH + DB_NAME " + DB_PATH + DB_NAME);
            File dbfile = new File(myPath);
            // checkdb =
            // SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE);
            checkdb = dbfile.exists();
        } catch (SQLiteException e) {
            Log.d("Trong", "Database doesn't exist");
        }
        return checkdb;
    }





    private void copydatabase() throws IOException {
        AssetManager am = activity.getAssets();
        OutputStream os = new FileOutputStream(DB_PATH + DB_NAME);
        byte[] b = new byte[1024];
        String[] files = am.list("");
        Arrays.sort(files);
        int r;
        InputStream is=null;
        for (int i = 1; i <= 2; i++) {
            if(i==1)
                 is = am.open("state.sqlite");
else
is=am.open("Category.sqlite");

            while ((r = is.read(b)) != -1) {
                os.write(b, 0, r);
            }
            Log.i("BABY_DATABASE_HELPER", "Copying the database (part " + i
                    + " of 9)");
            is.close();
        }
        os.close();
    }

    public void opendatabase() throws SQLException {
        // Open the database
        String mypath = DB_PATH + DB_NAME;
        db = SQLiteDatabase.openDatabase(mypath, null,
                SQLiteDatabase.OPEN_READWRITE);
    }

    public synchronized void close() {
        if (db != null) {
            db.close();
        }
        super.close();
    }

        public ArrayList<StateEntity> getAllState() {
            // TODO Auto-generated method stub
            ArrayList<StateEntity> flashcardentity = new ArrayList<StateEntity>();


            String selectQuery;


            selectQuery = "SELECT  *  FROM  "+"STATETB ";


            Cursor cursor = db.rawQuery(selectQuery, null);
            Log.d("cursorfav", "c"+cursor.getCount()+" "+selectQuery);
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {

                     Log.d("cursorfav", "cinside");
                     StateEntity fl = new StateEntity();
                    //itto.setId(cursor.getStringStateEntity0));
                       fl.setCid(cursor.getString(0));
                       fl.setSid(cursor.getString(1));
                       fl.setName(cursor.getString(2));



                    flashcardentity.add(fl);
                } while (cursor.moveToNext());
            }
            return flashcardentity; 
        }   
        public ArrayList<CityEntity> getCity(String STATEID) {
            // TODO Auto-generated method stub
            ArrayList<CityEntity> flashcardentity = new ArrayList<CityEntity>();
            String selectQuery;
            selectQuery = "SELECT  *  FROM  "+"CITYTB WHERE SID="+"'"+STATEID+"'";
            Cursor cursor = db.rawQuery(selectQuery, null);
            Log.d("cursorfav", "c"+cursor.getCount()+" "+selectQuery);
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                     Log.d("cursorfav", "cinside");
                     CityEntity fl = new CityEntity();
                       fl.setCity_id(cursor.getString(0));
                       fl.setName(cursor.getString(1));
                       fl.setSid(cursor.getString(2));
                    flashcardentity.add(fl);
                } while (cursor.moveToNext());
            }

            // return contact list
            return flashcardentity; 
        }
        public ArrayList<ProfessionEntity> getParentCategory(String User_typ){
            ArrayList<ProfessionEntity> flashcardentity = new ArrayList<ProfessionEntity>();
            String selectQuery;
            selectQuery="SELECT * FROM "+"Upload_category WHERE User_typ="+"'"+User_typ+"'";
            Cursor cursor=db.rawQuery(selectQuery, null);
            Log.d("cursorfav", "c"+cursor.getCount()+""+selectQuery);
            if(cursor.moveToFirst()){
                do{
                    Log.d("cursorfav", "cinside");
                    ProfessionEntity pe=new ProfessionEntity();
                    pe.setUser_typ(cursor.getString(0));
                    pe.setParent_key(cursor.getInt(1));
                    pe.setParent(cursor.getString(2));
                    flashcardentity.add(pe);
                }while(cursor.moveToNext());
            }
            return flashcardentity;
        }
        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub

        }   

        }