Button = buttonX;

        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.fourthactivity);

            buttonX = (Button)findViewById(R.id.button1);

            buttonX.setOnClickListener(
                    new View.OnClickListener()
                    {
                        public void onClick(View view)
                        {
                            EditText text = (EditText)findViewById(R.id.editText1);
                            String user = text.getText().toString();
                            EditText text = (EditText)findViewById(R.id.editText2);
                            String pass = text.getText().toString();

                            if(){
                                TextView successTextview = (TextView)findViewById(R.id.textView1);
                                successTextview.setText("Success!");
                            }
                            else{
                                TextView errorTextview = (TextView)findViewById(R.id.textView1);
                                errorTextview.setText("Error!");
                            }
                        }
                    }
            );
        }

    }

}