通过回调，Fragment向Activity传递信息

来源：互联网发布：傻瓜p图软件编辑：程序博客网时间：2024/04/26 00:53

可以定义一个接口，然后在Acitivity中实现该接口，在Fragement中通过回调，将信息发送至Acitivity中

MainActivity.java:

interface CallBack {    public void call(Bundle arg);    }public class MainActivity extends Activity implements CallBack{      Button sendButton;    String  name=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ChooseFragment chooseFragment=new ChooseFragment();        FragmentTransaction transaction=getFragmentManager().beginTransaction();        transaction.replace(R.id.main, chooseFragment);          }    @Override    public void call(Bundle arg) {        String s=arg.getString("name");        Toast.makeText(this,s,Toast.LENGTH_SHORT).show();        name=s;    }}

ChooseFragment.java

public class ChooseFragment extends Fragment {    CallBack callBack=null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        View view= inflater.inflate(R.layout.fragment_choose, container, false);        Bundle bundle=new Bundle();        bundle.putString("name","hello");        callBack.call(bundle);        return view;    }    @Override    public void onAttach(Activity activity){        super.onAttach(activity);        callBack=(MainActivity)activity;    }}

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