login.java

  public void loginMethod(String name, String password){
        if (isEmpty(name)) {
            editName.setError("Username is empty");
            return;
        }
      
        if (isEmpty(password)) {
            editPasword.setError("Password is empty");
            return;
        }
      
        if(!name.equals(username)) {
            editName.setError("Username is incorrect");
            return;
        }

        if(!password.equals(userpassword)) {
            editPasword.setError("Password is incorrect");
            return;
        }

        Intent intent=new Intent(MainActivity.this,Main2Activity.class);
        startActivity(intent);
    }