如何將捆綁數據從一個片段獲取到另一個片段？

Question

我有兩個 fragment.addfragment 和控制片段。 從 addfragment 我使用帶有片段事務的包發送數據，然后在控制片段中，我想使用包獲取該數據，但我無法獲取數據。 所以請幫助我

這是我的帶有片段事務的 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();
    }
});

在控制片段中，我以這種方式獲取數據......但我無法獲取數據

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

您正在設置構造函數而不是對象。 使用下面的代碼

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 );

這是變化。

Answer 2

在oncreate中的oncreate視圖之前做取數據。在設置數據之前總是做空檢查錯誤。希望這對你有幫助

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

編輯：

正如阿姆里什·卡卡迪亞指出的那樣

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

這行代碼產生了一個問題， new ControlFragment() 創建了一個全新的片段實例，因此您在檢索時將 getArguments() 設為 null。

Answer 3

使用這條線

捆綁包 = getArguments();

在你膨脹你的 rootview 之前