Androidでの解析とリストビューでの結果の表示

Question

このjsonレスポンスを文字列に変換してリストビューにデータを表示する方法これは私のjsonデータです。私はリストビューでデータを表示しようとしていますが、動作していません。

{ 
    "courseDataSet": { 
     "totalCount": 2, 
     "limit": 10, 
     "offset": 0, 
     "rows": [ 
     {}, 
     { 
      "id": 4, 
      "company_id": 2, 
      "user_id": 5, 
      "jobType": "Requirement Form", 
      "jobTitle": "Senior Web Developer", 
      "skills": "core php, java,jQuery", 
      "industry": "Information Technologies", 
      "department": "IT Department", 
      "vacancy": 2, 
      "qualification": "Master", 
      "degreeTitle": "MCS", 
      "miniExperience": 1, 
      "jobCategory": "Part-Time", 
      "jobstatus": "Accepted", 
      "city": "Lahore", 
      "gender": "Female", 
      "salaryRange": "25,000-29,999", 
      "companyName": null, 
      "description": "employees required", 
      "posting_date": "2016-09-22", 
      "applied_date": "2016-10-22", 
      "companyLogo": null, 
      "remember_token": null, 
      "deleted_at": null, 
      "created_at": "2016-09-24 04:45:39", 
      "updated_at": "2016-10-01 08:00:54" 
     }] 
    } 
} 

マイアダプタクラス

package com.example.bc120402700.myapplication; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.List; 

/** 
* Created by bc120402700 on 9/27/2016. 
*/ 
public class ContactAdapter extends ArrayAdapter { 


    List list=new ArrayList(); 
    public ContactAdapter(Context context, int resource) { 
     super(context, resource); 
    } 



    public void add(Contacts object) { 
     super.add(object); 
     list.add(object); 
    } 

    @Override 
    public int getCount() { 
     return list.size(); 
    } 


    @Override 
    public Object getItem(int position) { 
     return list.get(position); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View row; 
     row=convertView; 
     ContactHolder contactHolder; 
     if (row==null){ 


      LayoutInflater layoutInflater= (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row=layoutInflater.inflate(R.layout.row_layout,parent,false); 
      contactHolder=new ContactHolder(); 
      contactHolder.tx_name= (TextView) row.findViewById(R.id.tx_name); 
      contactHolder.tx_email= (TextView) row.findViewById(R.id.tx_email); 
      contactHolder.tx_mobile= (TextView) row.findViewById(R.id.tx_mobile); 
      row.setTag(contactHolder); 
     } 

     else { 

      contactHolder=(ContactHolder)row.getTag(); 


     } 
     Contacts contacts= (Contacts) this.getItem(position); 
     contactHolder.tx_name.setText(contacts.getName()); 
     contactHolder.tx_email.setText(contacts.getEmail()); 
     contactHolder.tx_mobile.setText(contacts.getMobile()); 
     return row; 
    } 


    static class ContactHolder{ 


TextView tx_name,tx_email,tx_mobile; 


    } 
} 

私のモデルクラス

package com.example.bc120402700.myapplication; 

/** 
* Created by bc120402700 on 9/27/2016. 
*/ 
public class Contacts { 

    private String name,email,mobile; 


    public Contacts(String name,String email, String mobile){ 
     this.name=name; 
     this.email=email; 

     this.mobile=mobile; 



    } 
    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getMobile() { 
     return mobile; 
    } 

    public void setMobile(String mobile) { 
     this.mobile = mobile; 
    } 

    public String getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 
} 

MY主な活動。

package com.example.bc120402700.myapplication; 

import android.content.Intent; 
import android.os.AsyncTask; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 

public class MainActivity extends AppCompatActivity { 

    String json_string; 




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


public void getjson(View view){ 

new AdminAllocationTask().execute(); 
} 

    public void parsejson(View view) { 


     if (json_string == null) { 

      Toast.makeText(getApplicationContext(), "first get json data", Toast.LENGTH_LONG).show(); 

     } else { 
      Intent intent = new Intent(this, DisplayListView.class); 
      intent.putExtra("json_data", json_string); 
      startActivity(intent); 

     } 
    } 

    class AdminAllocationTask extends AsyncTask<Void, Void, String> { 
     String json_url; 

     @Override 
     protected void onPreExecute() { 
      json_url = "http://mantis.vu.edu.pk/GameClub/public/sendingRequestList"; 
     } 
     String JSON_STRING; 
     @Override 
     protected String doInBackground(Void... voids) { 

      try { 



       URL url = new URL(json_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
       InputStream inputStream = httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 
       StringBuilder stringBuilder = new StringBuilder(); 

       while ((JSON_STRING = bufferedReader.readLine()) != null) { 

        stringBuilder.append(JSON_STRING + "\n"); 

       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 
       return stringBuilder.toString().trim(); 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } 
      catch (IOException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     @Override 
     protected void onProgressUpdate(Void... values) { 
      super.onProgressUpdate(values); 
     } 

     @Override 
     protected void onPostExecute(String result) { 

      TextView textview = (TextView) findViewById(R.id.textview); 
      textview.setText(result); 
      json_string = result; 


     } 
    } 
} 

MY表示リスト動作。

package com.example.bc120402700.myapplication; 

import android.os.PersistableBundle; 
import android.os.health.SystemHealthManager; 
import android.provider.ContactsContract; 
import android.provider.Settings; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.ListView; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.List; 

public class DisplayListView extends AppCompatActivity { 
String json_string; 
    JSONObject jsonObject; 
    JSONArray jsonArray; 
    ListView listView; 

    ContactAdapter contactAdapter; 




    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_display_list_view); 
     listView= (ListView) findViewById(R.id.listView); 

     contactAdapter=new ContactAdapter(this,R.layout.activity_display_list_view); 
     listView.setAdapter(contactAdapter); 

     json_string=getIntent().getExtras().getString("json_data"); 
     System.out.print(json_string + "dskljfsldjflsd"); 

     try { 



//   jsonObject=new JSONObject(); 
      JSONObject jsonObject = new JSONObject(json_string); 
//   JSONArray query = jsonParse.getJSONArray("courses"); 

      jsonArray=jsonObject.getJSONArray("sendingReqDataSet"); 


      int count=0; 
      String name,email,moblile; 

      while (count<jsonArray.length()){ 
       JSONObject JO=jsonArray.getJSONObject(count); 
       name=JO.getString("request_to"); 
       email= JO.getString("request_by"); 
       moblile=JO.getString("product_name"); 
       Contacts contacts=new Contacts(name,email,moblile); 
       contactAdapter.add(contacts); 
       count++; 
      } 


     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 

    } 
} 

これは私のログ結果です。

W/System.err: org.json.JSONException: Value [[{"id":1,"userid":5,"jobid":null,"title":null,"description":"Viral Webbs is currently seeking a Senior PHP Developer to join our team.\r\n\r\nThe ideal candidate for the Senior PHP Developer role is a self-starter who relishes the chance to take ownership over assigned projects while working collaboratively in a team environment.\r\n\r\nThe Senior PHP Developer is dedicated to his craft, and who can hit the ground running.\r\n\r\nWe need you to write beautiful, fast PHP to a high standard, in a timely and scalable way that improves the code-base of our products in meaningful ways.\r\n\r\nYou will be a part of a creative team that is responsible for all aspects of the ongoing web development from the initial specification, through to developing, testing and launching.\r\n\r\nEssential Duty and responsibilities:\r\n\r\nIntegral member of a creative team in a dynamic, fast-paced environment;\r\nDesign and develop web based applications using PHP and other web technologies;\r\nResponsible for all aspects of ongoing web development from initial specification through development, testing and launching;\r\nDevelop and deploy new features to facilitate related procedures and tools if necessary;\r\nPassion for best design and coding practices and a desire to develop bold new ideas;\r\nIdentify and encourage areas for growth and improvement within the team\r\nBuild web applications that scale in face of ever increasing traffic;\r\nBuild applications that are extendable;\r\nCoordinate with management , and other members in planning and meeting all objectives and be responsible for estimations and tracking of development efforts;\r\nWorking with and re-platforming legacy applications;\r\nBuild ecommerce applications using Magento;\r\nStrong knowledge of Wordpress websites at customizing level.\r\nWordpress theme development or plugin development will be great plus.\r\nMust have knowledge of MVC and proven experience in CodeIgniter and Laravel.\r\nExpertise in UI\/UX will be a plus","status":null},{"id":4,"userid":5,"jobid":null,"title":null,"description":"employees required","status":null}],{"courseDataSet":{"totalCount":2,"limit":10,"offset":0,"rows":[{"id":1,"company_id":1,"user_id":5,"jobType":"Requirement Form","jobTitle":"php developer","skills":"Larvel,php","industry":"Information Technologies","department":"IT Department","vacancy":2,"qualification":"Bachelor","degreeTitle":"Bscs","miniExperience":2,"jobCategory":"Full-Time","jobstatus":"Accepted","city":"Lahore","gender":"Male","salaryRange":"25,000-29,999","companyName":null,"description":"Viral Webbs is currently seeking a Senior PHP Developer to join our team.\r\n\r\nThe ideal candidate for the Senior PHP Developer role is a self-starter who relishes the chance to take ownership over assigned projects while working collaboratively in a team environment.\r\n\r\nThe Senior PHP Developer is dedicated to his craft, and who can hit the ground running.\r\n\r\nWe need you to write beautiful, fast PHP to a high standard, in a timely and scalable way that improves the code-base of our products in meaningful ways.\r\n\r\nYou will be a part of a creative team that is responsible for all aspects of the ongoing web development from the initial specification, through to developing, testing and launching.\r\n\r\nEssential Duty and responsibilities:\r\n\r\nIntegral member of a creative team in a dynamic, fast-paced environment;\r\nDesign and develop web based applications using PHP and other web technologies;\r\nResponsible for all aspects of ongoing web development from initial specification through development, testing and launching;\r\nDevelop and deploy new features to facilitate related procedures and tools if necessary;\r\nPassion for best design and coding practices and a desire to develop bold new ideas;\r\nIdentify and encourage areas for growth and improvement within the team\r\nBuild web applications that scale in face of ever increasing traffic;\r\nBuild applications that are extendable;\r\nCoordinate wi 
W/System.err:  at org.json.JSON.typeMismatch(JSON.java:111) 
W/System.err:  at org.json.JSONObject.<init>(JSONObject.java:160) 
W/System.err:  at org.json.JSONObject.<init>(JSONObject.java:173) 
W/System.err:  at com.example.bc120402700.myapplication.DisplayListView.onCreate(DisplayListView.java:45) 
W/System.err:  at android.app.Activity.performCreate(Activity.java:6664) 
W/System.err:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
W/System.err:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) 
W/System.err:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
W/System.err:  at android.app.ActivityThread.-wrap12(ActivityThread.java) 
W/System.err:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:102) 
W/System.err:  at android.os.Looper.loop(Looper.java:154) 
W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6077) 
W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
I/Choreographer: Skipped 47 frames! The application may be doing too much work on its main thread. 

Answer 1

私はあなたの解決策を実行していますが、これは要件を満たすためのパターンです。

1.要件のモデルクラスを作成します。 2.サーバーからデータを取得し、データを解析します。 3.データをモデルクラスタイプのarraylistに渡します。 4. baseAdapterを使用して、このarraylistをlsitviewに設定します。

ここで、アクティビティクラスにジャンプし、モデルクラスタイプのarraylistを作成します。

ArrayList<ModelExample> al_modelExample=new ArrayList<>(); 

      //parse and get required data from server; 

        String name=jsonobj.optString("name"); 
        int age=jsonobj.getInt("age"); 
        al_modelExample.add(new ModelExample(name,int)); 

        //to get values from arraylist. 
        al_modelExample.get(index).getName(); 

あなたがBaseAdapterを使用せずに1行の文字列など、いくつかのデータを表示したいならば、ModelクラスのtoString（）メソッドをオーバーライドします。

EDIT

あなたは型の不一致エラーを取得しているとして。次のようにしてください。

// jarrayから値を取得するようになりました。

// doinBackground（）でresult.toString（）を返すことを忘れないでください。これはあなた

Answer 2

は、以下のようなJSONをパースするのに役立ちます

希望： -

JSONArray jsonarray = new JSONArray(json_string); 
    for (int i = 0; i < jsonarray.length(); i++) { 
     JSONObject jsonobject = jsonarray.getJSONObject(i); 
     JSONObject jo=jsonobject.getJSONObject("sendingReqDataSet"); 
     JsonArray contacts=jo.getJSONArray("contacts"); 
    for(int j=0;j<contacts.length();j++){ 
    JSONObject details = contacts.getJSONObject(j); 
    String email= details.getString("request_by"); 
     } 
    }