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Filling JSON at this link on android Listview

I am trying to display items in a list from JSON ::

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_width="fill_parent" android:layout_height="fill_parent" > <ListView android:id="@+id/listViewID" android:layout_width="fill_parent" android:layout_height="fill_parent" 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_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tvname" android:layout_width="wrap_content" android:layout_height="wrap_content" 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_width="wrap_content" android:layout_height="wrap_content" 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_width="wrap_content" android:layout_height="wrap_content" 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_width="wrap_content" android:layout_height="wrap_content" 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_width="wrap_content" android:layout_height="wrap_content" 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(); } } }
  • I am trying to populate data from JSON to listView, some ambiguity when populating MainActivity.java
  • which collection to use for this function?
  • Any ideas. It looks simple, but for a novice like me, giving it a lot of struggle to find out.

Thanks,

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4 answers

Continuing my class:

 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); } }

adater:

 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; } }

data storage object:

 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; } }

xml for list item (save under itemlistrow name):

 <TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:orientation="vertical" android:layout_width="fill_parent"> <TableRow android:layout_width="fill_parent" android:id="@+id/TableRow01" android:layout_height="wrap_content"> <TextView android:id="@+id/age" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="age" android:textStyle="bold" android:gravity="left" android:layout_weight="1" android:typeface="monospace" android:height="40sp"/> </TableRow> <TableRow android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:id="@+id/name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="name" android:layout_weight="1" android:height="20sp"/> </TableRow> <TableRow android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:id="@+id/city" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="city" android:layout_weight="1" android:height="20sp"/> </TableRow> <TableRow android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:id="@+id/gender" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="city" android:layout_weight="1" android:height="20sp"/> </TableRow> <TableRow android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:id="@+id/birthdate" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="city" android:layout_weight="1" android:height="20sp"/> </TableRow> </TableLayout>

Repeated items from fooobar.com/questions/34982 / ...

Example:

 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; } }

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

+5
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Create a class, say Student, to hold a record, create an array of Student from JSON, and then use this with an ArrayAdapter to populate the ListView.

+1
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Using ArrayList would be better for you. See the following snippet,

Announce the following from above,

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

And after inside the try block after fetching Name

 FriendName .add(Name);

And you can easily get values ​​from arraylist through the index value, e.g.

 String data=FriendName.get(0);
+1
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I would use the GSON library for its simplicity. In this case, you will have the following:

POJO student class for data mapping

 public class Student private int id; private String name; private String city; private String Gender; private int age; private String birthdate; //getters and setters }

To analyze the data just do

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

And from here you just add data to the adapter and what it is.

+1
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Source: https://habr.com/ru/post/950797/

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