使用PHP對片段Volley上的RecyclerView解析錯誤檢索的JsonArrayRequest

Question

我正在練習在Fragments上實現recyclerView （我第一次），我想從服務器（phpMyAdmin）檢索這些數據。 我對php和mysql有一點了解。 我想要的只是以一種非常簡單的方式獲取我的數據，並在cardView - recyclerView顯示我的數據。 當我查看我的Java代碼時，現在看來（已得到糾正）。

在調試應用程序時，我發現它不會轉到我的onResponse而是轉到ErrorResponse 。 我如何解析這個權利？

這是我的片段： OrganizationAboutFragment .java

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

    recyclerView = (RecyclerView) inflater.inflate(
            R.layout.recycler_view, container, false);

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
    linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(linearLayoutManager);
    recyclerView.setHasFixedSize(true);

    orgListAdapter = new OrgListAdapter(organizationDataList);
    recyclerView.setAdapter(orgListAdapter);
    //GET DATA REQUEST
    parseJSONData();

    return recyclerView;
}

public void parseJSONData(){
    RequestQueue requestQueue = Volley.newRequestQueue(getContext());
    JsonArrayRequest jsonArray = new JsonArrayRequest(ServerScripts.PHP_SCRIPT_PATH + ServerScripts.PHP_GET_FEEDS, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            if (response.length() > 0){
                try {
                    organizationDataList.clear();
                    for (int i = 0; i < response.length(); i++ ){
                        JSONObject jsonObject = response.getJSONObject(i);
                        OrganizationData organizationData = new OrganizationData();

                        //SQL TABLE NAME
                        if (!jsonObject.isNull("orgName")){
                            organizationData.orgName = jsonObject.getString("orgName");
                        }

                        if (!jsonObject.isNull("orgDesc")){
                            organizationData.orgDesc = jsonObject.getString("orgDesc");
                        }

                        if (!jsonObject.isNull("orgCategory")){
                            organizationData.orgCategory = jsonObject.getString("orgCategory");
                        }

                        if (!jsonObject.isNull("orgCurrentMembers")){
                            organizationData.orgCurrentMembers = jsonObject.getInt("orgCurrentMembers");
                        }

                        if (!jsonObject.isNull("orgMaxMembers")){
                            organizationData.orgMaxMembers = jsonObject.getInt("orgMaxMembers");
                        }

                        if (!jsonObject.isNull("orgType")){
                            organizationData.orgType = jsonObject.getString("orgType");
                        }
                        //ADD
                        organizationDataList.add(organizationData);
                    }
                        //NOTIFY
                        orgListAdapter.notifyDataSetChanged();

                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }

    });
    requestQueue.add(jsonArray);

我的適配器： OrgListAdapter.java

public class OrgListAdapter extends RecyclerView.Adapter<OrgListAdapter.OrgViewHolder>{

private List<OrganizationData> mOrganizationData;

public OrgListAdapter(List<OrganizationData> mOrganizationData){
    this.mOrganizationData = mOrganizationData;
}

@Override
public OrgViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_cardview_flat_organizations,parent,false);
    OrgViewHolder myOrgViewHolder = new OrgViewHolder(view);

    return myOrgViewHolder;
}

@Override
public void onBindViewHolder(OrgViewHolder holder, int position) {
    //ORG MODELS PASS TO CARD VIEW - HOLDER
    holder.appCompatTextViewName.setText(mOrganizationData.get(position).getOrgName());
    holder.appCompatTextViewCategory.setText(mOrganizationData.get(position).getOrgCategory());
    holder.appCompatTextViewDesc.setText(mOrganizationData.get(position).getOrgDesc());
    holder.appCompatTextViewJoinMembers.setText(mOrganizationData.get(position).getOrgCurrentMembers());
    holder.appCompatTextViewMaxMembers.setText(mOrganizationData.get(position).getOrgMaxMembers());

}

@Override
public int getItemCount() {
    if (mOrganizationData != null){
        return mOrganizationData.size();
    }
    return 0;
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}


public static class OrgViewHolder extends RecyclerView.ViewHolder{

    CardView cardViewOrg;
    AppCompatTextView appCompatTextViewName;
    AppCompatTextView appCompatTextViewDesc;
    AppCompatTextView appCompatTextViewJoinMembers;
    AppCompatTextView appCompatTextViewMaxMembers;
    AppCompatTextView appCompatTextViewCategory;


    AppCompatImageView appCompatImageViewOrgType;
    String getDataStoredUniqueId = "";

    //Buttons
    AppCompatButton appCompatButtonJoin;
    AppCompatButton appCompatButtonFollow;
    AppCompatButton appCompatButtonReadMore;

    public OrgViewHolder(View getView){
        super(getView);

        cardViewOrg = (CardView) getView.findViewById(R.id.card_view_org);
        appCompatTextViewName = (AppCompatTextView) getView.findViewById(R.id.textViewOrgName);
        appCompatTextViewCategory = (AppCompatTextView) getView.findViewById(R.id.textViewCategory);
        appCompatTextViewDesc = (AppCompatTextView) getView.findViewById(R.id.textViewOrgShortDesc);
        appCompatTextViewJoinMembers = (AppCompatTextView) getView.findViewById(R.id.currentMembers);
        appCompatTextViewMaxMembers = (AppCompatTextView) getView.findViewById(R.id.maxMembers);
        appCompatImageViewOrgType = (AppCompatImageView) getView.findViewById(R.id.orgTypeIndicator);

        //Buttons
        appCompatButtonJoin = (AppCompatButton) getView.findViewById(R.id.imageButtonJoined);
        appCompatButtonFollow = (AppCompatButton) getView.findViewById(R.id.imageButtonFollow);
        appCompatButtonReadMore = (AppCompatButton) getView.findViewById(R.id.buttonMoreOrg);

    }

}

我的php代碼： orgList.php

<?php

//if($_SERVER['REQUEST_METHOD'] == ''){


     require('dbConnect.php');

     $SQLi_ORG_FEEDS = "SELECT organizationName,organizationDescription,organizationCategory,
                        organizationCurrentMembers,organizationMaxMembersNo,organizationType FROM org_information";

     $query = mysqli_query($dbConnect,$SQLi_ORG_FEEDS) or die("Error".mysqli_error($dbConnect));

     $checkRow = mysqli_num_rows($query);

     $response = array();

     if($checkRow > 0){
         while ($getRecord = mysqli_fetch_array($query)) {
            $response["organizationName"] = $getRecord;
            $response["organizationType"] = $getRecord;
            $response["organizationDescription"] = $getRecord;  
            $response["organizationCategory"] = $getRecord;
            $response["organizationCurrentMembers"] = $getRecord;
            $response["organizationMaxMembersNo"] = $getRecord;                
         }

         echo json_encode($response);
     }

//} 

Answer 1

在parseJSONData的onResponse中，創建一個新的OrganizationData對象並正確地進行解析，但是您絕不會將此對象添加到任何列表中。

您缺少organizationDataList.add(organizationData); 在您的for循環中。

另一個提示是要么在此之后立即調用notifyItemInserted ，要么在循環之后移動notifyDataSetChanged ：）

Answer 2

只需在您的for循環中添加此行

organizationDataList.add（organizationData）;

orgListAdapter.notifyDataSetChanged（）; //循環后

Answer 3

嘗試使用改造。 它比截擊更快，並且您無需解析JSON（標准JSON響應）。 改造僅接受標准JSON格式。 您必須傳遞Main MODEL類來存儲數據。 這是很棒的教程。 您將不必解析JSON。 只需使用並從response.body.yourPOJO（）;中獲取數據；

如果有幫助，請嘗試此操作。

http://www.androidwarriors.com/2015/12/retrofit-20-android-example-web.html