fragment 跳转到另一个fragment中

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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;    }}

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