Question

我有两个片段.addfragment和控制片段。从addfragment我使用带有片段事务的bundle发送数据，然后在控制片段中，我想使用bundle获取数据，但我无法获取数据。所以请帮助我

这是我的片段事务的addfragment -

     relaylist.setAdapter(adapter);
relaylist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {


        HashMap<String, String> o = (HashMap<String, String>) relaylist.getItemAtPosition(position);



        Log.e("ip: ", "> " +  o.get("ip"));
        Log.e("port: ", "> " +  o.get("port"));
        Log.e("uname: ", "> " +  o.get("uname"));
        Log.e("password: ", "> " +  o.get("password"));


        ControlFragment fragment = new ControlFragment();
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        Bundle bundle = new Bundle();
        bundle.putString("ip", o.get("ip"));
        bundle.putString("port", o.get("port"));
        bundle.putString("uname", o.get("uname"));
        bundle.putString("password", o.get("password"));
        Log.e("ip: ", "> " +  o.get("ip"));
        Log.e("port: ", "> " +  o.get("port"));
        Log.e("uname: ", "> " +  o.get("uname"));
        Log.e("password: ", "> " +  o.get("password"));
        fragment.setArguments(bundle);
        transaction.replace(R.id.mainFrame, new ControlFragment() );

        transaction.commit();
    }
});

并且在控件片段中，我以这种方式获取数据......但我无法获取数据

public class ControlFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView= inflater.inflate(R.layout.fragment_control, container, false);
        Bundle bundle = getArguments();

             String ip=bundle.getString("ip");
            Stirng port = bundle.getString("port");
            Stirng uname = bundle.getString("uname");
            Stirng password = bundle.getString("password");

Answer 1

您正在设置构造函数而不是对象。使用以下代码

ControlFragment fragment = new ControlFragment();
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        Bundle bundle = new Bundle();
        bundle.putString("ip", o.get("ip"));
        bundle.putString("port", o.get("port"));
        bundle.putString("uname", o.get("uname"));
        bundle.putString("password", o.get("password"));
        Log.e("ip: ", "> " +  o.get("ip"));
        Log.e("port: ", "> " +  o.get("port"));
        Log.e("uname: ", "> " +  o.get("uname"));
        Log.e("password: ", "> " +  o.get("password"));
        fragment.setArguments(bundle);
        transaction.replace(R.id.mainFrame, fragment  );

transaction.replace（R.id.mainFrame，fragment）;

这是改变。

Answer 2

使用此行

Bundle bundle = getArguments（）;

在你的根视图出现之前

Answer 3

在oncreate中创建oncreate视图之前获取数据。在设置data之前总是做一个空检查错误。希望这可以帮助你

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Bundle bundle = getArguments();
    if (bundle != null) {
        String ip=bundle.getString("ip");
        Stirng port = bundle.getString("port");
        Stirng uname = bundle.getString("uname");
        Stirng password = bundle.getString("password");
    }
}

修改：

Amrish Kakadiya指出

transaction.replace（R.id.mainFrame，new ControlFragment（））;

这行代码正在创建问题，新的ControlFragment（）创建了一个全新的片段实例，因此您在检索时将getArguments（）视为null。

如何从一个片段到另一个片段获取捆绑数据？

3 个答案: