应用程序在加载viewpager

时间：2018-04-20 11:11:02

标签： android android-fragments android-viewpager android-adapter

您好，我有动态表单在应用程序中显示。表单还包含我需要从Web服务获取每个页面的问题的部分（页面）。为此，我得到父活动上每个表单的节数。从活动我将一个表单的页面列表传递给viewPager适配器，然后我们通过重用相同的片段，根据来自Activity的列表动态创建页面数。我的应用程序在创建viewPager的最后一页时崩溃。

  

获取表单数据和每种形式的页面

 private void getFormsList()
{
    final ProgressDialog progressDialog = getProgressDialog(MainActivity.this);
    progressDialog.show();

    RestClient.getInstanceWithToken(MainActivity.this, "", "https://rj-corp-survey-app.herokuapp.com/").getForms().enqueue(new Callback<GetFormsListResponse>() {
        @Override
        public void onResponse(Call<GetFormsListResponse> call, Response<GetFormsListResponse> response) {
            GetFormsListResponse getFormsListResponse = response.body();

            if(getFormsListResponse != null && getFormsListResponse.equals("null") == false && getFormsListResponse.isSuccess() == true && getFormsListResponse.getCode() == 200)
            {
                formsArrayList = getFormsListResponse.getData().getForms();


                System.out.print("forms list>>>"+ formsArrayList);

                Toast.makeText(MainActivity.this, getFormsListResponse.getMessage(), Toast.LENGTH_SHORT).show();

                if(formsArrayList != null && formsArrayList.size()>0)
                {
                    for(int i=0; i<formsArrayList.size(); i++)
                    {
                        formCode = formsArrayList.get(i).getFormShortCode();

                        formCodeList.add(formCode);

                        sectionsArrayList = formsArrayList.get(i).getSections();


                        if(i==0)
                        {
                            distributorFormId = formsArrayList.get(i).get_id();

                            for(int j=0; j<formsArrayList.get(i).getSections().size(); j++)
                            {
                                String distributorForm = formsArrayList.get(i).getSections().get(j).getSectionShortCode();
                                DistributorSectionNames.add(distributorForm);
                                String sectionId = formsArrayList.get(i).getSections().get(j).get_id();
                                distributorSectionIdList.add(sectionId);
                            }
                        }
                        if(i==1)
                        {
                            outletFormId = formsArrayList.get(i).get_id();

                            for(int j=0; j<formsArrayList.get(i).getSections().size(); j++)
                            {
                                String outletForm = formsArrayList.get(i).getSections().get(j).getSectionShortCode();
                                OutletSectionNames.add(outletForm);
                                String sectionId = formsArrayList.get(i).getSections().get(j).get_id();
                                outletSectionIdList.add(sectionId);
                            }
                        }
                        if(i==2)
                        {
                            spokeFormId = formsArrayList.get(i).get_id();

                            for(int j=0; j<formsArrayList.get(i).getSections().size(); j++)
                            {
                                String spokeForm = formsArrayList.get(i).getSections().get(j).getSectionShortCode();
                                SpokeSectionNames.add(spokeForm);
                                String sectionId = formsArrayList.get(i).getSections().get(j).get_id();
                                spokeSectionIdList.add(sectionId);
                            }
                        }


                        if(sectionsArrayList != null && sectionsArrayList.size()>0)
                        {
                            for(int j=0; j<sectionsArrayList.size(); j++)
                            {
                                sectionCode = sectionsArrayList.get(j).getSectionShortCode();
                                sectionCodeList.add(sectionCode);
                            }
                        }
                    }
                }
                else
                {
                    Toast.makeText(MainActivity.this, "No Forms Present", Toast.LENGTH_SHORT).show();
                }

            }
            else if(getFormsListResponse != null && getFormsListResponse.equals("null") == false)
            {
                Toast.makeText(MainActivity.this, getFormsListResponse.getDescription(), Toast.LENGTH_SHORT).show();
            }
            else
            {
                Toast.makeText(MainActivity.this, "Invalid request", Toast.LENGTH_SHORT).show();
            }
            populateData(formCodeList,distributorFormId, distributorSectionIdList);
            progressDialog.dismiss();
        }

        @Override
        public void onFailure(Call<GetFormsListResponse> call, Throwable t) {
            Log.d("", "failure: " + t.getMessage());
            progressDialog.dismiss();
            Toast.makeText(MainActivity.this, t.getMessage() + "", Toast.LENGTH_SHORT).show();
        }
    });
}
  

将页面列表传递给适配器

private void populateData(ArrayList<String> formCodeList, String distributorFormId, ArrayList<String> distributorSectionIdList)
{
    ViewPager pager = findViewById(R.id.viewPager);
    pager.setAdapter(new FormAdapter(getSupportFragmentManager(), formCodeList, distributorFormId, distributorSectionIdList));
}
  

通过重用相同的片段

动态创建每个表单的页数 
public Fragment getItem(int position) {
        return FormFragment.newInstance(position + 1, getCount(), sections.get(position),distributorFormId, distributorSectionIdList.get(position) );
    }
  

newInsnce（）body 

public static FormFragment newInstance(int index, int total, String name, String distributorFormId, String distributorSectionId ) {
        FormFragment f = new FormFragment();
        Bundle args = new Bundle();
        args.putInt(KEY_INDEX, index);
        args.putInt(KEY_TOTAL, total);
        args.putString(KEY_NAME, name);
        args.putString(KEY_FORM_ID, distributorFormId);
        args.putString(KEY_SECTION_ID, distributorSectionId);
        f.setArguments(args);
        return f;
    }
  

错误日志

FATAL EXCEPTION: main
Process: com.ampersand.testdynamicforms, PID: 27738
   java.lang.NullPointerException
   at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6494)
   at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5680)
   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5563)
   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5559)
   at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2229)
   at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1556)
   at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1516)
   at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:608)
   at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693)
   at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3109)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
   at android.view.View.measure(View.java:16525)
   at android.widget.RelativeLayout.measureChild(RelativeLayout.java:689)
   at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:473)
   at android.view.View.measure(View.java:16525)
   at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1630)
   at android.view.View.measure(View.java:16525)
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
   at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
   at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2358)
   at android.view.View.measure(View.java:16525)
   at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1962)
   at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1159)
   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1341)
   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1046)
   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5660)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
   at android.view.Choreographer.doCallbacks(Choreographer.java:574)
   at android.view.Choreographer.doFrame(Choreographer.java:544)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
   at android.os.Handler.handleCallback(Handler.java:733)
   at android.os.Handler.dispatchMessage(Handler.java:9

0 个答案:

没有答案
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