从此链接填充 JSON 到 android Listview

Posted 2023-04-13

技术标签:

【中文标题】从此链接填充 JSON 到 android Listview【英文标题】：Populating JSON from this link to android Listview 【发布时间】：2013-08-02 00:31:23 【问题描述】：

我正在尝试从 JSON::

显示列表视图中的元素

JsonURL-https://dl.dropboxusercontent.com/s/rhk01nqlyj5gixl/jsonparsing.txt?token_hash=AAHpfauVxJaC9Rkx_5abNtJnPFG04os7TZky1AhOuC5jEw

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_ >

    <ListView
        android:id="@+id/listViewID"
        android:layout_
        android:layout_ 
        android:layout_gravity="center">
    </ListView>

</LinearLayout>

JSONParser.java

package com.example.testjson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser 

    static InputStream is = null;
    static JSONArray jObj = null;
    static String json = "";

    // constructor
    public JSONParser() 

    

    public JSONArray getJSONFromUrl(String url) 

        // Making HTTP request
        try 
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();           

         catch (UnsupportedEncodingException e) 
            e.printStackTrace();
         catch (ClientProtocolException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
        

        try 
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) 
                sb.append(line + "\n");
            
            is.close();
            json = sb.toString();
         catch (Exception e) 
            Log.e("Buffer Error", "Error converting result " + e.toString());
        

        // try parse the string to a JSON object
        try 
            jObj = new JSONArray(json);
         catch (JSONException e) 
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        

        // return JSON String
        return jObj;

row.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativelay"
    android:layout_
    android:layout_
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tvname"
        android:layout_
        android:layout_
        android:layout_alignParentTop="true"
        android:layout_marginLeft="5dip"
        android:maxLines="1"
        android:text="Name"
        android:textColor="@android:color/black"
        android:textSize="14dp"
        android:textStyle="bold" >
    </TextView>

    <TextView
        android:id="@+id/tvcity"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tvname"
        android:layout_marginLeft="5dip"
        android:layout_marginTop="3dip"
        android:maxLines="1"
        android:text="City"
        android:textColor="@android:color/black"
        android:textSize="14dp" >
    </TextView>

    <TextView
        android:id="@+id/tvbdate"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tvcity"
        android:layout_marginLeft="5dip"
        android:layout_marginTop="3dip"
        android:maxLines="1"
        android:text="Birthdate"
        android:textColor="@android:color/black"
        android:textSize="14dp" >
    </TextView>

    <TextView
        android:id="@+id/tvgender"
        android:layout_
        android:layout_
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="15dip"
        android:maxLines="1"
        android:text="Gender"
        android:textColor="@android:color/black"
        android:textSize="14dp"
        android:textStyle="bold" >
    </TextView>

    <TextView
        android:id="@+id/tvage"
        android:layout_
        android:layout_
        android:layout_alignParentRight="true"
        android:layout_below="@+id/tvgender"
        android:layout_marginRight="15dip"
        android:layout_marginTop="3dip"
        android:maxLines="1"
        android:text="Age"
        android:textColor="@android:color/black"
        android:textSize="14dp" >
    </TextView>

</RelativeLayout>

MainActivity.java

package com.example.testjson;

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

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

import android.os.Bundle;
import android.app.Activity;
import android.text.StaticLayout;
import android.view.Menu;

public class MainActivity extends Activity 

    private static String url="https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1";

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

        //Create a JSON parser Instance ----- Used JSON parser from Android
        JSONParser jParser=new JSONParser();

        //Getting JSON string from URL ------ Used JSON Array from Android
        JSONArray json=jParser.getJSONFromUrl(url);

        try 
            for(int i=0;i<json.length();i++)
            
                JSONObject c=json.getJSONObject(i);// Used JSON Object from Android

                //Storing each Json in a string variable
                int AGE=c.getInt("age");
                String NAME=c.getString("name");
                String CITY=c.getString("city");
                String GENDER=c.getString("Gender");
                String BIRTHDATE=c.getString("birthdate");



            
         catch (JSONException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();

我正在尝试将数据从 JSON 填充到 listView，一些填写不明确MainActivity.java 该功能使用什么集合？任何想法，这看起来很简单，但对于像我这样的初学者来说努力学习

谢谢，

【问题讨论】：

好问题！ ....即使我正在寻找这样的东西......以及对问题的良好解释！......将等待答案！ 【参考方案1】：

继续上课：

public class MainActivity extends Activity 

    private static String url="https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1";

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

        //Create a JSON parser Instance ----- Used JSON parser from Android
        JSONParser jParser=new JSONParser();

        //Getting JSON string from URL ------ Used JSON Array from Android
        JSONArray json=jParser.getJSONFromUrl(url);

        List<WhateverObject> yourData = new ArrayList<WhateverObject>();

        try 
            for(int i=0;i<json.length();i++)
            
                JSONObject c=json.getJSONObject(i);// Used JSON Object from Android

                //Storing each Json in a string variable
                int AGE=c.getInt("age");
                String NAME=c.getString("name");
                String CITY=c.getString("city");
                String GENDER=c.getString("Gender");
                String BIRTHDATE=c.getString("birthdate");


                yourData.add(new WhateverObject(NAME, CITY, GENDER, BIRTHDATE));

            
         catch (JSONException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        

        ListView yourListView = (ListView) findViewById(R.id.itemListView);

        ListAdapter customAdapter = new ListAdapter(this, R.layout.itemlistrow, yourData);

        yourListView.setAdapter(customAdapter);

适配器：

public class ListAdapter extends ArrayAdapter<Item> 

    public ListAdapter(Context context, int textViewResourceId) 
        super(context, textViewResourceId);
        // TODO Auto-generated constructor stub
    

    private List<Item> items;

    public ListAdapter(Context context, int resource, List<Item> items) 

        super(context, resource, items);

        this.items = items;
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 

        View v = convertView;

        TextView tt = null;
        TextView tt1 = null;
        TextView tt2 = null;
        TextView tt3 = null;
        TextView tt4 = null;

        if (v == null) 

            LayoutInflater vi;
            vi = LayoutInflater.from(getContext());
            v = vi.inflate(R.layout.itemlistrow, null);

            tt = (TextView) v.findViewById(R.id.age);
            tt1 = (TextView) v.findViewById(R.id.name);
            tt2 = (TextView) v.findViewById(R.id.city);
            tt3 = (TextView) v.findViewById(R.id.gender);
            tt4 = (TextView) v.findViewById(R.id.birthdate);
        

        Item p = items.get(position);

        if (p != null) 

            if (tt != null) 
                tt.setText(""+p.getAge());
            
            if (tt1 != null) 

                tt1.setText(""+p.getName());
            
            if (tt2 != null) 

                tt2.setText(""+p.getCity());
            

            if (tt3 != null) 

                tt3.setText(""+p.getGender());
            

            if (tt4 != null) 

                tt4.setText(""+p.getBirthdate());
            
        



        return v;

对象持有数据：

public class WhateverObject
    private int age;
    private String name;
    private String city;
    private String gender;
    private String birthdate;        

    public WhateverObject(int age, String name, String city, String gender, String birthdate)
        this.age = age;
        this.name = name;
        this.city = city;
        this.gender = gender;
        this.birthdate = birthdate;
    

    public int getAge()
        return this.age;
    

    public String getName()
        return this.name;
    

    public String getCity()
        return this.city;
    

    public String getGender()
        return this.gender;
    

    public String getBirthdate()
        return this.birthdate;

列表视图项的xml（保存在itemlistrow名称下）：

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_ android:orientation="vertical"
             android:layout_>

    <TableRow android:layout_
              android:id="@+id/TableRow01"
              android:layout_>

        <TextView
                android:id="@+id/age"
                android:layout_
                android:layout_
                android:text="age" android:textStyle="bold"
                android:gravity="left"
                android:layout_weight="1"
                android:typeface="monospace"
                android:/>
    </TableRow>

    <TableRow android:layout_
              android:layout_>

        <TextView
                android:id="@+id/name"
                android:layout_
                android:layout_
                android:text="name"
                android:layout_weight="1"
                android:/>
    </TableRow>

    <TableRow android:layout_
              android:layout_>

        <TextView
                android:id="@+id/city"
                android:layout_
                android:layout_
                android:text="city"
                android:layout_weight="1"
                android:/>
    </TableRow>

    <TableRow android:layout_
              android:layout_>

        <TextView
                android:id="@+id/gender"
                android:layout_
                android:layout_
                android:text="city"
                android:layout_weight="1"
                android:/>
    </TableRow>

    <TableRow android:layout_
              android:layout_>

        <TextView
                android:id="@+id/birthdate"
                android:layout_
                android:layout_
                android:text="city"
                android:layout_weight="1"
                android:/>
    </TableRow>

</TableLayout>

重用来自https://***.com/a/8166802/1276374的元素

更简单的例子：

public class MainActivity extends Activity 

    private static String url="https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1";

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

        //Create a JSON parser Instance ----- Used JSON parser from Android
        JSONParser jParser=new JSONParser();

        //Getting JSON string from URL ------ Used JSON Array from Android
        JSONArray json=jParser.getJSONFromUrl(url);

        List<Map<String, String>> personList = new ArrayList<Map<String,String>>();

        try 
            for(int i=0;i<json.length();i++)
            
                JSONObject c=json.getJSONObject(i);// Used JSON Object from Android

                //Storing each Json in a string variable
                int AGE=c.getInt("age");
                String NAME=c.getString("name");
                String CITY=c.getString("city");
                String GENDER=c.getString("Gender");
                String BIRTHDATE=c.getString("birthdate");


                personList.add(createPerson(AGE, NAME, CITY, GENDER, BIRTHDATE));

            
         catch (JSONException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        

        ListView yourListView = (ListView) findViewById(R.id.itemListView);

        simpleAdpt = new SimpleAdapter(this, personList, android.R.layout.simple_list_item_1, new String[] "person", new int[] android.R.id.text1);

        yourListView.setAdapter(simpleAdpt);

    

    private HashMap<String, String> createPerson(int age, String name, String city, String gender, String birthdate) 
        HashMap<String, String> person = new HashMap<String, String>();
        person.put("person", name+" | "+age + " | "+city + " | "+gender + " | "+birthdate);
        return person;

感谢http://www.javacodegeeks.com/2013/06/android-listview-tutorial-and-basic-example.html

【讨论】：

Mocialov Boris .....我用你的第一个解决方案尝试了你的解决方案......我在我的 LogCat 中收到如下错误...... ......................... 08-01 14:38:15.625：E/Buffer 错误（710）：错误转换结果 java.lang .NullPointerException 08-01 14:38:15.634: E/JSON Parser(710): 解析数据时出错 org.json.JSONException: 在 08-01 14:38:15.644 的字符 0 处输入结束：D/AndroidRuntime(710) : 关闭 VM ......................还有一些错误！ @Sky 似乎是 JSON 解析器的一个例外 ListAdapter customAdapter = new ListAdapter(this, R.layout.itemlistrow, yourData); .....我解决了JSON解析器的异常但是............在这一行有问题......错误::constructor适配器未定义 @Sky 将我的回答 Item 中的一些内容更改为 WhateverObject，同样操作 @Sky 在ListAdapter 中将ArrayList 更改为List - 已编辑答案【参考方案2】：

创建一个类，比如 Student，以包含一条记录，从 JSON 创建一个 Student 数组，然后将其与 ArrayAdapter 一起使用来填充您的 ListView。

【讨论】：

【参考方案3】：

使用ArrayList会更适合你。见下面sn-p，

在顶部声明以下内容，

public static ArrayList<String> FriendName = new ArrayList<String>();

在获取Name之后，try 块中的以下内容

FriendName .add(Name);

您可以通过如下索引值轻松地从数组列表中获取值，

String data=FriendName.get(0);

【讨论】：

【参考方案4】：

为了简单起见，我会使用 GSON 库。在这种情况下，您将拥有以下内容：

一个用于数据映射的 POJO 学生类

public class Student
    private int id;
    private String name;
    private String city;
    private String  Gender;
    private int age;
    private String birthdate;

    //getters and setters

只需解析数据即可

Student[] students;
Type token = new TypeToken<Student[]>() .getType();
Gson gson = new Gson();   
students = gson.fromJson(jsonString, token);

从这里您只需将数据添加到适配器，就是这样。

【讨论】：

以上是关于从此链接填充 JSON 到 android Listview的主要内容，如果未能解决你的问题，请参考以下文章

无法将json数组填充到数组列表android开发

如何从没有数组名称的android中的json中获取数据？

Android：SearchBox -> 使用通过 HTTP/JSON 接收的数据动态填充提示列表

如何添加 JSON 框架

ListView的用法

jquery用ajax方式从后台获取json数据后如何将内容填充到下拉列表