Android เปลี่ยนหน้า Fragment ในหน้า Fragment เอง โดยกดปุ่ม

FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replacee(R.id.fragment_container, newFragment);

class YourActivity extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ....
    }
    ....
    public void replaceFragment() {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.fragment_container, newFragment);
        transaction.commit();
    }

...

}

public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_addactivity, container, false);

Button someButton = (Button) rootView.findViewById(R.id.someButtonId);
someButton.setOnClickListener(new OnClickListener() {
			
	@Override
	public void onClick(View view) {
		((YourActivity)getActivity()).replaceFragment();
	}
});

return rootView;
}