회원가입 액티비티 로그인 액티비티 로그인 결과 액티비티 3개로 나누어서 로그인 결과 액티비티에서 로그인 값을 확인하여 회원정보가 맞으면 다음 액티비티로 넘어가고 로그인 값이 존재하지 않는다면 버튼을 누를수 없게 만들고 있는대 로그인 결과는 맞게 출력이 되지만 버튼이 항상 눌립니다. 조언좀 부탁드립니다.

//회원가입 액티비티 
ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(RegisterActivity.this, "회원가입이 완료되었습니다.", Toast.LENGTH_SHORT).show();

                SharedPreferences preferences = getSharedPreferences("MYPREFS", Context.MODE_WORLD_READABLE);

                String newUser = user.getText().toString();
                String newPassword = pass.getText().toString();
                String newEmail = email.getText().toString();

                SharedPreferences.Editor editor = preferences.edit();
                editor.putString("newEmail", newEmail);
                editor.commit();
                editor.putString("newPassword", newPassword);
                editor.commit();
                editor.putString(newEmail + newPassword + "data", newUser + " 님 환영합니다" + "\n" + newEmail);
                editor.commit();

                Intent intent = new Intent(RegisterActivity.this, MainActivity.class);

                startActivity(intent);
            }
        });

//로그인 액티비티
login.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {
                String login_email = email.getText().toString();
                String password = pass.getText().toString();
                SharedPreferences preferences = getSharedPreferences("MYPREFS", MODE_PRIVATE);

                String userDetails = preferences.getString(login_email + password + "data", "존재하지 않는 회원입니다.");
                SharedPreferences.Editor editor = preferences.edit();
                editor.putString("display", userDetails);
                editor.commit();

                Intent displayScreen = new Intent(MainActivity.this, DisplayScreen.class);
                displayScreen.putExtra("elogin",login_email);
                displayScreen.putExtra("epass",password);
                startActivity(displayScreen);
            }
        });

//로그인결과액티비티
final Button ok = (Button) findViewById(R.id.button_ok);

        SharedPreferences preferences = getSharedPreferences("MYPREFS", Context.MODE_WORLD_READABLE);
        String id = preferences.getString("newEmail","");
        String ps = preferences.getString("newPassword","");
        String display = preferences.getString("display", "1");

        TextView displayInfo = (TextView) findViewById(R.id.textViewName);
        displayInfo.setText(display);

        if (display.equals("1")) {
            ok.setClickable(false);

        } else  {
            ok.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(DisplayScreen.this, AppActivity.class);
                    startActivity(intent);
                }
            });
        }