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public class Fragment1 extends Fragment {

    Button bt_1;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment1, container, false);

        bt_1 = (Button) v.findViewById(R.id.bt_1);

        bt_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment fragment = new Fragment2();
                if (fragment != null) {
                    FragmentManager fragmentManager = getFragmentManager();
                    fragmentManager.beginTransaction()
                            .replace(R.id.frame_container, fragment).commit();

                }
            }
        });

        return v;
    }