کپی نشدن دیتابیس از پوشه assets

سلام خدمت دوستان

من با استفاده از روس sqliteopenhelper با دیتابیس کار میکنم ومشکلی نداره

ولی وقتی دیتابیسی رو از پوشه assets کپی میکنم دیتابیس من جدولی که داشته رو دیگه نداره واطلاعاتی نیست که بخواد بخونه

این هم کدهام ممنون میشم راهنمایی کنید

کدها:

public class ChatDatabase extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "chat_db";
    public static final int VERSION = 1;
    public static final String TABLE_NAME = "tbl_chat_list";
    public static final String DATABASE_PATH="data/data/testdatabase.clicksite.org.testdatabase/database/";
    public static final String COL_ID = "id";
    public static final String COL_USERNAME = "username";
    public static final String QUERY = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" +
            COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COL_USERNAME + " TEXT);";

    SQLiteDatabase database;

    Context context;

    public ChatDatabase(Context context) {
        super(context, DATABASE_NAME, null, VERSION);
        this.context = context;
    }

   /* @Override
    public void onCreate(SQLiteDatabase db) {
        try {
            db.execSQL(QUERY);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }*/

    @Override
    public void onCreate(SQLiteDatabase db) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }

    public void addChat(String username) {
        ContentValues cv = new ContentValues();
        cv.put(COL_USERNAME, username);
        SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
        long result = sqLiteDatabase.insert(TABLE_NAME, null, cv);
        if (result > 0) {
            Toast.makeText(G.context, "id is:" + result, Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(G.context, "faild", Toast.LENGTH_SHORT).show();
        }
    }

    public String openDatabase() {
        String path = context.getDatabasePath(DATABASE_NAME).getPath();
            return path;
    }

    public Cursor getAllRecords() {
        String query = "SELECT * FROM " + TABLE_NAME;
        SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
        return sqLiteDatabase.rawQuery(query, null);
    }

}

public class MainActivity extends AppCompatActivity {

    ArrayList<String> arrayList;
    TextView txtShow;
    ChatDatabase chatDatabase;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        arrayList=new ArrayList<>();

        txtShow = (TextView) findViewById(R.id.txtShow);
        chatDatabase = new ChatDatabase(G.context);
        File file=getApplicationContext().getDatabasePath(chatDatabase.DATABASE_NAME);
        if(!file.exists()){

            chatDatabase.getReadableDatabase();
            if(copyDatabase(this)){
                Toast.makeText(G.context,"succed",Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(G.context,"no",Toast.LENGTH_SHORT).show();
            }
        }

        String path = chatDatabase.openDatabase();
        //txtShow.setText(path);
        Cursor cursor = chatDatabase.getAllRecords();
        for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
            final int id = cursor.getInt(0);
            final String username = cursor.getString(1);
           // txtShow.setText(username);

            arrayList.add(username);

        }

        for(int i=0;i<arrayList.size();i++){
            txtShow.setText(arrayList.get(i));
        }

    }

    public boolean copyDatabase(Context context){
        try {
            InputStream inputStream=context.getAssets().open(chatDatabase.DATABASE_NAME);
            String outFileName=chatDatabase.DATABASE_PATH+chatDatabase.DATABASE_NAME;
            OutputStream outputStream=new FileOutputStream(outFileName);
            byte[] buffer=new byte[1024];
            int length=0;
            while((length=inputStream.read(buffer))>0){
                outputStream.write(buffer,0,length);
            }
            outputStream.flush();
            outputStream.close();

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



}