Question

我需要迭代数组并将每个数组项从activity传递给fragment;但是我的代码我只从最后一项传递给活动片段。

我希望你能帮助我！

我告诉你我的代码！

活动：

try {
                    JSONObject contacts = new JSONObject(jsonStr);
                    JSONArray jsonArray = contacts.getJSONArray("pdfs");
                    // looping through All Contacts
                    for (int i = 0; i < jsonArray.length(); i++) {
                        JSONObject c = jsonArray.getJSONObject(i);

                       // title_array.add(c.getString("title").toString());
                        url_pdf=c.getString("url_pdf");



                        SixFragment fragment =  new SixFragment();
                        fragment.setName(url_pdf);

                       /* Bundle bundle = new Bundle();
                        bundle.putString("user", url_pdf);
                        SixFragment fragmentt = new SixFragment();
                        fragmentt.setArguments(bundle);
                        getSupportFragmentManager()
                                .beginTransaction()
                                .replace(R.id.ah, fragmentt)
                                .commit();
*/

                    }

                    System.out.println("PDFSSSSSSS"+url_pdf);

                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG).show();
                        }
                    });

                }

FRAGMENT：

public class SixFragment  extends android.support.v4.app.Fragment {
String url_pdf="";
    SimpleAdapter adapter;
    ListView list;
    ArrayList<HashMap<String, String>> pdfList;
    HashMap<String, String> pdf;
    String data="";
    String arg="";
    static String azzzz="";
    public SixFragment() {
        // Required empty public constructor
    }
    public void setName(String string){
        azzzz = string;
    }

    @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_six, container, false);


        /*Bundle bundle=getArguments();

        String pala=bundle.getString("user");*/

        pdfList = new ArrayList<>();

        HashMap<String, String> pdf = new HashMap<>();

        // adding each child node to HashMap key => value
        pdf.put("id", azzzz);


        // adding contact to contact list
        pdfList.add(pdf);

        for (int i = 0; i < pdfList.size(); i++) {
            System.out.println("CONTAT:"+pdfList.size());
        }
        list = (ListView) view.findViewById(R.id.listView);

        ListAdapter adapter = new SimpleAdapter(
                getContext(), pdfList,
                R.layout.list_item, new String[]{"id"}, new int[]{R.id.name});



        list.setAdapter(adapter);

        return view;

    }

SIX_FRAGMENT.XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container_frame_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="info.androidhive.materialtabs.fragments.SixFragment">



    <fragment
        android:id="@+id/ah"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"/>

    <ListView
        android:layout_width="match_parent"
        android:id="@+id/listView"
        android:layout_height="wrap_content"/>


</RelativeLayout>

Answer 1

您正在设置url_pdf反复分段，但url_pdf始终只保留1个值。您应该创建一个Array或JsonObject并将其作为Extra。传递。

活性;

try {
                JSONObject contacts = new JSONObject(jsonStr);
                JSONArray jsonArray = contacts.getJSONArray("pdfs");

                Bundle bundle = new Bundle();
                bundle.putString("user", list);
                SixFragment fragmentt = new SixFragment();
                fragmentt.setArguments(bundle);
                getSupportFragmentManager()
                            .beginTransaction()
                            .replace(R.id.ah, fragmentt)
                            .commit();


            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Json parsing error: " + e.getMessage(),
                                Toast.LENGTH_LONG).show();
                    }
                });

            }

片段：

public class SixFragment  extends android.support.v4.app.Fragment {
    ArrayList<String> list;

    ...
    public SixFragment getInstance(JSONArray json) {
        Bunble b = new Bundle();
        b.putExtra("JSON",json);
        SixFragment f = new SixFragment();
        f.setArguments(b);
        return f;
    }


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        savedInstance = savedInstanceState != null;
        super.onCreate(savedInstanceState);
        JSONArray jsonArray = getArguments.get("JSON");
        // looping through All Contacts
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject c = jsonArray.getJSONObject(i);
            list.add(c.getString("url_pdf"));
            System.out.println("PDFSSSSSSS"+url_pdf);
        }
}

Answer 2

注意：您可以使用Gson而不是手动解析JSON。

在活动中

try {
    // Instantiate a new ArrayList to store the urls
    ArrayList<String> urls = new ArrayList<>();

    JSONObject contacts = new JSONObject(jsonStr);
    JSONArray jsonArray = contacts.getJSONArray("pdfs");
    // looping through All Contacts
    for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject c = jsonArray.getJSONObject(i);
        String url_pdf = c.getString("url_pdf");

        // add the url to the array of 'url_pdf'
        urls.add(url_pdf);

        // Display each url retrieved (not necessary)
        System.out.println("PDFSSSSSSS" + url_pdf);
    }

    SixFragment fragment = SixFragment.newInstance(urls);
    getSupportFragmentManager().beginTransaction()
            // Replace the current Fragment. Use the Fragment class name as tag (can
            // be useful to find the fragment later)
            .replace(R.id.ah, fragment, fragment.getClass().getSimpleName())
            .commit();

} catch (final JSONException e) {
    Log.e(TAG, "Json parsing error: " + e.getMessage());
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(getApplicationContext(),
                    "Json parsing error: " + e.getMessage(),
                    Toast.LENGTH_LONG).show();
        }
    });
}

在SixFragment中

private static final String ARGS_URLS = "bundle_urls";
private ArrayList<String> mUrls;
private ArrayAdapter<String> mAdapter;

public SixFragment() {
    // Required empty public constructor
}

/**
 * @param urls ArrayList of url_pdf
 * @return A new instance of the {@link SixFragment}
 */
public static SixFragment newInstance(ArrayList<String> urls) {

    Bundle args = new Bundle();
    // put the array into the fragment arguments bundle
    args.putStringArrayList(ARGS_URLS, urls);

    SixFragment fragment = new SixFragment();
    fragment.setArguments(args);

    return fragment;
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Retrieve data from the Fragment's arguments
    mUrls = getArguments().getStringArrayList(ARGS_URLS);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_six, container, false);
    ListView listView = (ListView) view.findViewById(R.id.listView);

    // Use an ArrayAdapter instead of the SimpleAdapter as it automatically manage a List
    mAdapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, mUrls);
    listView.setAdapter(mAdapter);

    return view;
}

将数据从活动传递到片段的问题

2 个答案: