Two different layouts are not working on single activity

i have two xml layouts with one activity i used setContentView() for calling them but when i call the second view it called but not working. here is the code: when i click the fok button the the second layout shows but the buttons on it are not working. please help

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.activity_reset_pas);
    setContentView(R.layout.forpasrest);

    fok.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                fok.setBackgroundColor(Color.rgb(220, 215, 255));
                setContentView(R.layout.activity_reset_pas);

                flag=false;
            }

    });

    fback.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                fback.setBackgroundColor(Color.rgb(220, 215, 255));

                Intent intent = new Intent(ResetPasActivity.this,SignInActivity.class);
                startActivity(intent);
                finish();

            }
    });

    if(flag==false){

        ok.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                    Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();

            }
        });

        back.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                back.setBackgroundColor(Color.rgb(220, 215, 255));
                Intent intent = new Intent(ResetPasActivity.this,SignInActivity.class);
                startActivity(intent);
                finish();
            }
        });
    }
}