如何将此json响应转换为字符串以在列表视图中显示数据。这是我的json数据。我正在尝试在列表视图中显示数据，但它不起作用。请指导我。
{
"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"
}]
}
}
我的适配器类
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;
}
}
我的模特课
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;
}
}
我的主要活动。
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;
}
}
}
我的显示列表活动。
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();
}
}
}
这是我的日志结果。
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.
答案 0 :(得分：0)
我正在做你的解决方案，但这是一种达到你要求的模式。
1.创建您的要求的模型类。 2.从服务器获取数据并解析数据。 3.将数据传递给模型类的arraylist。 4.使用baseAdapter将此arraylist设置为lsitview。
public class ModelExample{
String name;
int age;
ModelExample(String name,int age)
{
this.name=name;
this.age=age;
}
//here click alt+ins ,you will find a getter and setter. select all
// and click enter to get getter and setter methods.
}
现在转到Activity类并创建模型类类型的arraylist。
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();
如果要在不使用BaseAdapter的情况下在一行中将某些数据显示为String，则覆盖Model类中的toString（）方法。
修改
因为您遇到类型不匹配错误。做到以下几点。
output =
new getURLData()
.execute().get();
JsonArray jarray=new JsonArray(output);
//现在从jarray中获取值。
//不要忘记在doinBackground（）中返回result.toString（）。
希望这有助于你
答案 1 :(得分：0)
解析json如下： -
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");
}
}