在Android中將數據從一個片段傳遞到下一個片段

Question

在我的一個項目中，我正在使用2個片段。一個片段正在顯示項目列表，所以我想在第一個片段中選擇主題時，應該在另一個片段中更改詳細信息。我可以從一個片段傳遞數據到另一個視圖，但視圖不變。在哪種方法中，我應該實現第二個片段的視圖，以便可以相應地更改。 請給我很好的教程或示例。

在這里我必須開發一個android示例，我必須運行該應用程序，這意味着在第一個片段的水平listview上很好地顯示了類別名稱。我必須單擊任何類別意味着我該如何在第二個片段上傳遞類別名稱。請給我解決方案對於這個問題。

我用下面的代碼：

public class Home extends FragmentActivity{

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

第一個片段代碼：

public class MainActivity extends Fragment {
static final String URL = "http://dev2.mercuryminds.com/webservices/new_feed_articls.xml";

 static String KEY_CATEGORY = "Categories";

 static final String KEY_TITLE = "Category";
 LazyAdapter adapter;

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
     View view = inflater.inflate(R.layout.activity_main,
                container, false); 


    final ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
    XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML from URL
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_TITLE);


        // looping through all song nodes &lt;song&gt;
        for (int i = 0; i < nl.getLength(); i++) {
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>   ();
            Element e = (Element) nl.item(i);
            map.put( KEY_TITLE,((Element)nl.item(i)).getAttribute("name"));

           // map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
            songsList.add(map);
        }
        HorizontalListView list = (HorizontalListView) view.findViewById(R.id.listView1);
    adapter = new LazyAdapter(getActivity(), songsList);
      list.setAdapter(adapter);

       list.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            HashMap<String, String> map = songsList.get(position);
            Intent in = new Intent();
            in.setClass(getActivity(), SubCate.class);
           // in.putExtra(KEY_TITLE, map.get(KEY_TITLE));

                     startActivity(in); 
        }  

     });
        return view;
    }}

我如何在第二個活動中顯示類別名稱...請給我這些代碼...

編輯：

嗨，我在第一次活動中更改了代碼：

   HashMap<String, String> map = songsList.get(position);
            SubCate frag = (SubCate) getFragmentManager().findFragmentById(R.id.frag_2);
            if (frag != null && frag.isInLayout()) {
            frag.setText(getCapt(map));
            }
            }
            private String getCapt(HashMap<String, String> map) {
            if (map.containsValue("notchbolly")) {
            return "dadad";
            }
                return "veeman"; 

在下一個活動中：

public void setText(String item) {
 TextView view = (TextView) getView().findViewById(R.id.cate);
 view.setText(item);
  }

當直接在if（map.containsValue（“ notchbolly”））上提及名稱時，它的功能很好。但是我必須直接顯示名稱而不提及名稱。如果我必須單擊任何類別，則意味着該類別名稱顯示在下一個片段上。我能怎么做 ？？？？？

Answer 1

使用接口方法，我們可以在片段之間傳輸數據

在fragmentA中創建接口並將數據發送到此接口，並在fragmentB中實現此接口方法並獲取所需的數據

以下代碼對您有用

FragmentA中的代碼：

    public class FragmentA extends Fragment  {

    // interface method
    public    InterfaceDataCommunicatorBetweenfragmentAToFragmentB     iInterfaceDataCommunicatorBetweenfragmentAToFragmentB;

    // Data to send
    String mDataString;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        // use this line where u send data  
        iInterfaceDataCommunicatorBetweenfragmentAToFragmentB.upDatedData(mDataString);

        View view = inflater.inflate(R.layout.sent_box, container, false);


        return view ;
    }

    /**
         * Interface method to send data to fragmentB
         * 
         */
        public interface InterfaceDataCommunicatorBetweenfragmentAToFragmentB                                       {
            public void upDatedData(String data);

        }
    }

FragmentB中的代碼：

   class FragmentB extends Fragment implements InterfaceDataCommunicatorBetweenfragmentAToFragmentB {

    // interface method
    public InterfaceDataCommunicatorBetweenfragmentAToFragmentB iInterfaceDataCommunicatorBetweenfragmentAToFragmentB;

    // fragmentA data
    String mgetUpdatedData


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {


            View view = inflater.inflate(R.layout.get_box, container, false);


        return view ;
    }

   /**
     * Interface method coming from fragment a to fragmentB after  implement interface in fragmentB
     */
    public void upDatedData(String data) {
        this.mgetUpdatedData = data;
    }

    @Override
    public void onAttach(Activity activity) {
        // TODO Auto-generated method stub
        super.onAttach(activity);
        try {
            iInterfaceDataCommunicatorBetweenfragmentAToFragmentB = (InterfaceDataCommunicatorBetweenfragmentAToFragmentB ) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement interface");
        }

    }

Answer 2

您需要實現接口機制。

請參閱以下鏈接以獲取更多詳細信息。

http://developer.android.com/guide/components/fragments.html#CommunicatingWithActivity http://developer.android.com/training/basics/fragments/communicating.html