near "@gmail" Syntax error

i am creating login activity with Boolean function but get error while match email address with email address in database but give error

this is my dbHandler class method

 public Boolean loginCheck(String email,String password)
{
    Boolean flag=false;
    String selectQuery = "SELECT  * FROM " + TABLE_NAME + " WHERE email=" + email +" AND pass="+password;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);
    // Move to first row
    cursor.moveToFirst();
    if(cursor.getCount() == 1){
      flag=true;
    }
    else
    {
      flag=false;
    }

    return flag;
}

this is java file code

login.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String emailValue=edtEmail.getText().toString();//this is EditText
            String passValue=edtPass.getText().toString();

            if(db.loginCheck(emailValue, passValue))
            {
                Intent in = new Intent(getApplicationContext(), Home.class);
                startActivity(in);
                Toast.makeText(getApplicationContext(), "Login Successful", 2000).show();
            }
            else
            {
                Toast.makeText(getApplicationContext(), "Username and Password not match", 5000).show();
            }
        }
    });

get error

 01-23 04:58:30.519: E/AndroidRuntime(2422):                                                     android.database.sqlite.SQLiteException: near "@gmail": syntax error (code  1): , while compiling: SELECT  * FROM login WHERE email=stackoverflow@gmail.com AND pass=stackoverflow
 01-23 04:58:30.519: E/AndroidRuntime(2422):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
  01-23 04:58:30.519: E/AndroidRuntime(2422):   at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)

please provide Solution of it