fragment 跳转到另一个fragment中

要实现一个从Afragment中跳转到Bfragment中的例子

MainActivity.java

public class MainActivity extends AppCompatActivity {
    BlankFragment2 blankFragment2;
@Override
    protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show();
    }

private void show() {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        BlankFragment rightFragment = new BlankFragment();
        transaction.add(R.id.fragmentlayout, rightFragment);
        transaction.commit();
    }
}

BlankFragment.java文件

public class BlankFragment extends Fragment {
public BlankFragment() {
    }
@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_blank, container, false);
        Button btu = (Button) v.findViewById(R.id.colick);
        btu.setOnClickListener(new View.OnClickListener() {
@Override
            public void onClick(View v) {
                MainActivity activity= (MainActivity) getActivity();
                FragmentManager fm = activity.getFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                activity.blankFragment2 = new BlankFragment2();
                ft.replace(R.id.fragmentlayout, activity.blankFragment2);
                ft.commit();
            }
        });
return v;
    }
}