Question

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这里的情况是我有一个主要活动作为我的三个片段的调解者，并且在三个片段中有各自的回收者视图。

我的问题是我需要设置主要的三个frags的所有回收站视图的适配器，它不能由intent / bundle完成，因为它们全部同时运行而我似乎无法从主要活动中调用回收者对3个碎片的看法。

主要示例

public class classList_index extends AppCompatActivity {

private float c_qGrade;
private List<QuarterlyGrade_Config> TransGrade;
private List<tracksettingEquiv_Config> equiv;
private List<maxGrade_Config> maxgrade;
private List<batchList_config> studentList;

f_ww_Adapter wwAdapter;
f_pt_Adapter ptAdapter;
f_qe_Adapter qeAdapter;

FragmentPagerAdapter adapterViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_class_list_index);

    ViewPager vpPager = (ViewPager) findViewById(R.id.vpPager);
    adapterViewPager = new MyPagerAdapter(getSupportFragmentManager());
    vpPager.setAdapter(adapterViewPager);
    vpPager.setCurrentItem(0);

    populateList();
}

private void populateList()
{
    studentList = new ArrayList<>();


    final String loadURL = APP.DOMAIN+"/selectStudents.php";
    RequestQueue reqQueue = Volley.newRequestQueue(classList_index.this);

    StringRequest loadRequest = new StringRequest(Request.Method.POST, loadURL, new Response.Listener<String>() {
        @Override
        public void onResponse(String response){
            try
            {
                JSONObject CLASS_LIST_JSON = new JSONObject(response);
                JSONArray STUDENT_LIST_JARRAY = CLASS_LIST_JSON.getJSONArray("student_list");

                for(int students = 0; students < STUDENT_LIST_JARRAY.length(); students++)
                {
                    JSONObject p_JSONObject = STUDENT_LIST_JARRAY.getJSONObject(students);

                    final String p_studentID    = p_JSONObject.getString("USERID");
                    final String p_lastName  = p_JSONObject.getString("LASTNAME");
                    final String p_firstName  = p_JSONObject.getString("FIRSTNAME");
                    final String p_middleName  = p_JSONObject.getString("MIDDLENAME");
                    final String p_gender  = p_JSONObject.getString("GENDER");
                    final String p_ww1  = p_JSONObject.getString("WW1");
                    final String p_ww2  = p_JSONObject.getString("WW2");
                    final String p_ww3  = p_JSONObject.getString("WW3");
                    final String p_ww4  = p_JSONObject.getString("WW4");
                    final String p_ww5  = p_JSONObject.getString("WW5");
                    final String p_ww6  = p_JSONObject.getString("WW6");
                    final String p_ww7  = p_JSONObject.getString("WW7");
                    final String p_ww8  = p_JSONObject.getString("WW8");
                    final String p_ww9  = p_JSONObject.getString("WW9");
                    final String p_ww10  = p_JSONObject.getString("WW10");
                    final String p_pt1  = p_JSONObject.getString("PT1");
                    final String p_pt2  = p_JSONObject.getString("PT2");
                    final String p_pt3  = p_JSONObject.getString("PT3");
                    final String p_pt4  = p_JSONObject.getString("PT4");
                    final String p_pt5  = p_JSONObject.getString("PT5");
                    final String p_pt6  = p_JSONObject.getString("PT6");
                    final String p_pt7  = p_JSONObject.getString("PT7");
                    final String p_pt8  = p_JSONObject.getString("PT8");
                    final String p_pt9  = p_JSONObject.getString("PT9");
                    final String p_pt10  = p_JSONObject.getString("PT10");
                    final String p_qe  = p_JSONObject.getString("QE1");

                    batchList_config studentConfig = new batchList_config(p_studentID,p_firstName,p_lastName,p_middleName,p_gender,p_ww1,p_ww2,p_ww3,p_ww4,p_ww5,p_ww6,p_ww7,p_ww8,p_ww9,p_ww10,p_pt1,p_pt2,p_pt3,p_pt4,p_pt5,p_pt6,p_pt7,p_pt8,p_pt9,p_pt10,p_qe);
                    studentList.add(studentConfig);
                }
                wwAdapter = new f_ww_Adapter(classList_index.this, studentList);
                ptAdapter = new f_pt_Adapter(classList_index.this, studentList);
                qeAdapter = new f_qe_Adapter(classList_index.this, studentList);


                //where the adapter of recycler views should all be set 
            }
            catch (JSONException e) {
                volleyErrorClass.catchInvalidResponse(e.toString(), classList_index.this);
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            volleyErrorClass.catchError(error, classList_index.this);
            error.printStackTrace();
        }
    });

    reqQueue.add(loadRequest);

}

public static class MyPagerAdapter extends FragmentPagerAdapter
{
    private static int NUM_ITEMS = 3;

    public MyPagerAdapter(FragmentManager fragmentManager) {
        super(fragmentManager);
    }

    // Returns total number of pages
    @Override
    public int getCount() {
        return NUM_ITEMS;
    }

    // Returns the fragment to display for that page
    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0: 
                return f_wworks.newInstance();
            case 1:
                return f_ptasks.newInstance();
            case 2:
                return f_qexams.newInstance();
            default:
                return null;
        }
    }

    // Returns the page title for the top indicator
    @Override
    public CharSequence getPageTitle(int position) {
        switch (position)
        {
            case 0:
                return "Written\nWorks";
            case 1:
                return "Performance\nTasks";
            case 2:
                return "Quarterly\nAssessment";
            default:
                return null;
        }
    }

}

片段示例

public class f_wworks extends Fragment {

private static RecyclerView rv_ww;

private OnFragmentInteractionListener mListener;

public f_wworks() {
}

public static f_wworks newInstance() {
    f_wworks fragment = new f_wworks();

    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

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

    rv_ww = (RecyclerView) holder.findViewById(R.id.rv_wworks);
    rv_ww.setLayoutManager(new LinearLayoutManager(getActivity()));
    rv_ww.setHasFixedSize(true);



    return holder;
}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
    if (mListener != null) {
        mListener.onFragmentInteraction(uri);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    if (context instanceof OnFragmentInteractionListener) {
        mListener = (OnFragmentInteractionListener) context;
    //} else {
      //  throw new RuntimeException(context.toString()
        //        + " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(Uri uri);
}

Answer 1

您可以使用#=> permissions.rb module Permissions ... def self.method #=> method name instead of the method #=> code staff here end or def method #=> method name instead of the method #=> code staff here end ... end中的fragment实例并使用它来调用Main中的公共方法，如

主要

Fragment

现在你的片段

<强> f_wworks

//declare globally f_wworks fw; f_ptasks fp; f_qexams fq; @Override public Fragment getItem(int position) { switch (position) { case 0: fw = f_wworks.newInstance(); return fw; case 1: fp = f_ptasks.newInstance(); return fp; case 2: fq = f_qexams.newInstance(); return fq; default: return null; } } private void populateList() { //Once you created adapter fw.setDataToAdapter(wwAdapter); //do this to other fragments }

将适配器从主活动设置为其片段

1 个答案: