Need help on JSON parsing

Need help on JSON parsing - android

I have my json file like this:
{
"shops": [
{
"id": "11",
"name": "Next",
"description": "Opened in 2005, offers a selection of clothes, shoes and accessories.",
"url": "/shop/550/127",
"categories": [
"4",
"33",
"34",
"16"
],
"bg_image": "/uploads/static/shop/460px/2012/12/5385-127-sale.jpg"
},
.....
I want to fetch this shops according to the categories using "categories". For example if the men's jeans clicked from the list, then all shops associated with that categories displayed as a list. And this JSON file stored in sdcard. Currently I am able to fetch all the shops if a list item clicked. But I couldn't filter according to the categories.
Jean.java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import org.json.JSONObject;
import com.kabelash.sg.util.ExternalStorage;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class Jeans extends Activity {
private final String JSON_file = "api_output_example.json";
File jsonFile;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.baby1_1);
/** Getting Cache Directory */
File cDir = ExternalStorage.getSDCacheDir( this, "json_files" );
/** Getting a reference to temporary file, if created earlier */
jsonFile = new File(cDir.getPath() + "/" + JSON_file) ;
String strLine="";
StringBuilder strJson = new StringBuilder();
/** Reading contents of the temporary file, if already exists */
try {
FileReader fReader = new FileReader(jsonFile);
BufferedReader bReader = new BufferedReader(fReader);
/** Reading the contents of the file , line by line */
while( (strLine=bReader.readLine()) != null ){
strJson.append(strLine);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
//System.out.println(strJson);
/** Start parsing JSON data */
new ListViewLoaderTask().execute(strJson.toString());
}
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
/** Doing the parsing of JSON data in a non-ui thread */
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
jObject = new JSONObject(strJson[0]);
CountryJSONParser countryJsonParser = new CountryJSONParser();
countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
CountryJSONParser countryJsonParser = new CountryJSONParser();
List<HashMap<String, String>> shops = null;
try{
/** Getting the parsed data as a List construct */
shops = countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
/** Keys used in Hashmap */
String[] from = { "shop","image","description"};
/** Ids of views in listview_layout */
int[] to = { R.id.tv_country,R.id.iv_flag,R.id.tv_country_details};
/** Instantiating an adapter to store each items
* R.layout.listview_layout defines the layout of each item
*/
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), shops, R.layout.lv_layout, from, to);
return adapter;
}
/** Invoked by the Android system on "doInBackground" is executed completely */
/** This will be executed in ui thread */
#Override
protected void onPostExecute(SimpleAdapter adapter) {
/** Getting a reference to listview of main.xml layout file */
ListView listView = ( ListView ) findViewById(R.id.lv_countries);
/** Setting the adapter containing the country list to listview */
listView.setAdapter(adapter);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
countryJSONParser.java
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class CountryJSONParser {
/** Receives a JSONObject and returns a list */
public List<HashMap<String,String>> parse(JSONObject jObject){
JSONArray jShops = null;
try {
/** Retrieves all the elements in the 'countries' array */
jShops = jObject.getJSONArray("shops");
} catch (JSONException e) {
e.printStackTrace();
}
/** Invoking getShops with the array of json object
* where each json object represent a country
*/
return getShops(jShops);
}
private List<HashMap<String, String>> getShops(JSONArray jShops){
int shopCount = jShops.length();
List<HashMap<String, String>> shopList = new ArrayList<HashMap<String,String>>();
HashMap<String, String> shop = null;
/** Taking each shop, parses and adds to list object */
for(int i=0; i<shopCount;i++){
try {
/** Call getShop with shop JSON object to parse the shop */
shop = getShop((JSONObject)jShops.get(i));
shopList.add(shop);
} catch (JSONException e) {
e.printStackTrace();
}
}
return shopList;
}
/** Parsing the shop JSON object */
private HashMap<String, String> getShop(JSONObject jShop){
HashMap<String, String> shop = new HashMap<String, String>();
String shopName = "";
String image="";
String description = "";
String categories = "";
//String capital = "";
try {
shopName = jShop.getString("name");
image = jShop.getString("bg_image_small");
description = jShop.getString("description");
categories = jShop.getString("categories");
String details = "Description : " + description;
//if (categories.equals("11")){
shop.put("shop", shopName);
shop.put("image", image);
shop.put("description", details);
shop.put("categories", categories);
//}
} catch (JSONException e) {
e.printStackTrace();
}
return shop;
}
}
The above given code work fine but I want to know how to filter it. and I want to display images on listview using "bg_image" link (the images are stored on sdcard). Can someone please edit this code according to my requirement? (Unfortunately I couldn't find anything useful on Google). Please help!
Edited: Now I tried to do something like this but couldn't get it right.
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ShopJSONParser {
public class Shop {
public String name;
public String category;
public String description;
public String image;
public ArrayList<String> category_list;
}
/** Receives a JSONObject and returns a list */
public List<HashMap<String,String>> parse(JSONObject jObject){
JSONArray jShops = null;
try {
// Retrieves all the elements in the 'shops' array
jShops = jObject.getJSONArray("shops");
} catch (JSONException e) {
e.printStackTrace();
}
// Invoking getShops with the array of json object
// where each json object represent a shop
return getShops(jShops);
}
ArrayList<Shop> shops_array = new ArrayList<Shop>();
private List<HashMap<String, String>> getShops(JSONArray jShops){
int shopCount = jShops.length();
List<HashMap<String, String>> shopList = new ArrayList<HashMap<String,String>>();
HashMap<String, String> shop = null;
/** Taking each shop, parses and adds to list object */
for (int i = 0; i < jShops.length(); i++) {
JSONObject Shop_json_obj = jShops.getJSONObject(i);
Shop shop1 = new Shop();
String name = Shop_json_obj.getString("name");
String description = Shop_json_obj.getString("description");
shop1.name = name;
shop1.description = description;
shop1.category_list = new ArrayList<String>();
JSONArray categories_json_array = null;
categories_json_array = shop1.getJSONArray("categories");
for (int j = 0; j < categories_json_array.length(); j++) {
String cat = categories_json_array.getString(j);
shop1.category_list.add(cat);
}
shops_array.add(shop1);
}
return shopList;
}
/** Parsing the shop JSON object */
private HashMap<String, String> getShop(JSONObject jShop){
HashMap<String, String> shop = new HashMap<String, String>();
String shopName = "";
String image="";
String description = "";
String categories = "";
try {
shopName = jShop.getString("name");
image = jShop.getString("bg_image_small");
description = jShop.getString("description");
categories = jShop.getJSONArray("categories").toString();
System.out.println(categories);
String details = "Description : " + description;
//if (categories.equals("13")){
shop.put("shop", shopName);
shop.put("image", image);
//shop.put("description", details);
//shop.put("categories", categories);
//}
} catch (JSONException e) {
e.printStackTrace();
}
return shop;
}
}
Further help required. Thanks.

Firstly, i think you are parsing it wrong. 'categories' is JsonArray while you are parsing it as a string. You should be doing it as an array. so, its basically an array inside an array. Once you are done with it, you could easily tag an individual item as the appropriate category based on the category value.
Edit:
A better way to do that would be to create a Shop object with desired attributes and then Populate a List of Shop objects in your JSON parsing function. e.g
public class Shop{
public String name;
public String description;
public String image;
public ArrayList<String> category_list;
public Shop(){
category_list = new ArrayList<String>();
}
}
and here is your modified CountryJSONParser :
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class CountryJSONParser {
/** Receives a JSONObject and returns a list */
public ArrayList<Shop> parse(JSONObject jObject){
JSONArray jShops = null;
try {
/** Retrieves all the elements in the 'countries' array */
jShops = jObject.getJSONArray("shops");
} catch (JSONException e) {
e.printStackTrace();
}
/** Invoking getShops with the array of json object
* where each json object represent a country
*/
return getShops(jShops);
}
private ArrayList<Shop> getShops(JSONArray jShops){
int shopCount = jShops.length();
ArrayList<Shop> shops_array = new ArrayList<Shop>();
Shop shop = new Shop();
/** Taking each shop, parses and adds to list object */
for(int i=0; i<shopCount;i++){
try {
/** Call getShop with shop JSON object to parse the shop */
shop = getShop((JSONObject)jShops.get(i));
//shopList.add(shop);
shops_array.add(shop);
} catch (JSONException e) {
e.printStackTrace();
}
}
return shops_array;
}
/** Parsing the shop JSON object */
private Shop getShop(JSONObject jShop){
Shop shop = new Shop();
try {
shop.name = jShop.getString("name");
shop.image = jShop.getString("bg_image_small");
String details = "Description : " + shop.description;
shop.description = details;
shop.category_list = new ArrayList<String>();
JSONArray categories_json_array = null;
categories_json_array = jShop.getJSONArray("categories");
for (int j = 0; j < categories_json_array.length(); j++) {
String cat = categories_json_array.getString(j);
shop.category_list.add(cat);
}
} catch (JSONException e) {
e.printStackTrace();
}
return shop;
}
}

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Google maps API auto complete is not working

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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android:versionCode="1"
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android:allowBackup="true"
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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package in.wptrafficanalyzer.locationplacesautocomplete;
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import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
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/** Receives a JSONObject and returns a list */
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JSONArray jPlaces = null;
try {
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} catch (JSONException e) {
e.printStackTrace();
}
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HashMap<String, String> place = null;
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private HashMap<String, String> getPlace(JSONObject jPlace){
HashMap<String, String> place = new HashMap<String, String>();
String id="";
String reference="";
String description="";
try {
description = jPlace.getString("description");
id = jPlace.getString("id");
reference = jPlace.getString("reference");
place.put("description", description);
place.put("_id",id);
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e.printStackTrace();
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.widget.AutoCompleteTextView;
import android.widget.SimpleAdapter;
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AutoCompleteTextView atvPlaces;
PlacesTask placesTask;
ParserTask parserTask;
#Override
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super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
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atvPlaces.setThreshold(1);
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#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
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placesTask.execute(s.toString());
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#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
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// TODO Auto-generated method stub
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});
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String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
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StringBuffer sb = new StringBuffer();
String line = "";
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#Override
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JSONObject jObject;
#Override
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List<HashMap<String, String>> places = null;
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
try{
jObject = new JSONObject(jsonData[0]);
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i have generated API key and inserted in mainactivity class, am new for android is there any other sources to learn about this?

How to check weather JsonArray value available or not in android from webservice and get its data?

I am working on learning JsonParsing. In that I have some category_list array. I parse data from that array and bind it to a listView in android. From that list I also again have to make an API call to that Web-service and check that sub-category are there or not ? If there is no sub category then it will be product list. i have tried as below but i have unable to parse from productList json
How to decide or give me any solution logic for it. My code is as below:
main.java
package com.epe.yehki.ui;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.epe.yehki.backend.ServiceHandler;
import com.epe.yehki.uc.Header;
import com.example.yehki.R;
import android.R.string;
import android.app.Activity;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class SubCategoryActivity extends ListActivity {
// SUB CATEGORIES...
private static final String TAG_CAT_LlIS = "categories_list";
private static final String TAG_CAT_ID = "category_id";
private static final String TAG_CAT_NAME = "category_name";
int flag;
public Header header;
public TextView title;
// PRODUCTS....
private static final String TAG_PRODUCT_ID = "product_id";
private static final String TAG_PRODUCT_LlST = "product_list";
private static final String TAG_PRODUCT_NAME = "product_name";
private static final String TAG_PRODUCT_IMG = "image";
private static final String TAG_PRODUCT_DESCRIPTION = "detail_description";
// contacts JSONArray
JSONArray subcategories = null;
JSONArray products = null;
public String catid;
public String id;
String name;
JSONObject jsonObj;
// Hashmap for ListView
ArrayList<HashMap<String, String>> subcategoryList;
ArrayList<HashMap<String, String>> productList;
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "http://yehki.epagestore.in/app_api/categories.php";
private static String mainurl = "http://yehki.epagestore.in/";
public String suburl = "";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub);
this.header = (Header) findViewById(R.id.headersubcat);
title = (TextView) findViewById(R.id.title);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
try {
catid = in.getStringExtra(TAG_CAT_ID);
name = in.getStringExtra(TAG_CAT_NAME);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("::::::::::::::MY CATEGORY ID::::::::::::::IN SUB "
+ catid);
subcategoryList = new ArrayList<HashMap<String, String>>();
suburl = "http://yehki.epagestore.in/app_api/categories.php?"
+ TAG_CAT_ID + "=" + catid;
System.out.println("::::::::::::::::MY SUBCATEGORY URL::::::::::::"
+ suburl);
title.setText(name);
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new GetSubCategories().execute();
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lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String catname = ((TextView) view.findViewById(R.id.name))
.getText().toString();
Intent in = new Intent(getApplicationContext(),
SubCategoryTwoActivity.class);
in.putExtra(TAG_CAT_NAME, catname);
in.putExtra(TAG_CAT_ID, catid);
startActivity(in);
}
});
}
private class GetSubCategories extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(SubCategoryActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
System.out.println(":::::::::::::::::::SUB URL:::::::::::::::::"
+ suburl);
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(suburl, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
if (jsonObj.has(TAG_CAT_LlIS)) {
subcategories = jsonObj.getJSONArray(TAG_CAT_LlIS);
if (subcategories != null
&& subcategories.length() != 0) {
// looping through All Contacts
flag = 0;
System.out
.println(":::::::::::FLAG IN SUB:::::::::::"
+ subcategories.length());
for (int i = 0; i < subcategories.length(); i++) {
JSONObject c = subcategories.getJSONObject(i);
id = c.getString(TAG_CAT_ID);
String name = c.getString(TAG_CAT_NAME);
// tmp hashmap for single category
HashMap<String, String> subcategory = new HashMap<String, String>();
// adding each child node to HashMap key =>
// value
subcategory.put(TAG_CAT_ID, id);
subcategory.put(TAG_CAT_NAME, name);
// adding contact to contact list
subcategoryList.add(subcategory);
}
}
} else {
flag = 1;
products = jsonObj.getJSONArray(TAG_PRODUCT_LlST);
System.out
.println("==========SIZE OF MY ARRAY PRODUCT LIST==================="
+ products.length());
System.out
.println(":::::::::::::::::::Product array:::::::::::::::"
+ products);
// looping through All Contacts
for (int i = 0; i < products.length(); i++) {
JSONObject p = products.getJSONObject(i);
String proId = p.getString(TAG_PRODUCT_ID);
String proName = p.getString(TAG_PRODUCT_NAME);
String productImg = p.getString(TAG_PRODUCT_IMG);
String productDesc = p
.getString(TAG_PRODUCT_DESCRIPTION);
System.out
.println("::::::::::::::::MY PRODUCT DETAILS::::::::::::::"
+ TAG_PRODUCT_ID
+ " PRODUCT NAME "
+ TAG_PRODUCT_NAME
+ " PRODUCT_DESCRIPTION "
+ TAG_PRODUCT_DESCRIPTION
+ " PRODUCT IMAGE "
+ TAG_PRODUCT_IMG);
HashMap<String, String> product = new HashMap<String, String>();
// adding each child node to HashMap key => value
// product.put(TAG_PRODUCT_ID, proId);
product.put(TAG_PRODUCT_NAME, proName);
product.put(TAG_PRODUCT_DESCRIPTION, productDesc);
/*
* product.put(TAG_PRODUCT_IMG, productImg);
*/
productList.add(product);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
*
* */
if (flag == 0) {
ListAdapter adapter = new SimpleAdapter(
SubCategoryActivity.this, subcategoryList,
R.layout.list_item, new String[] { TAG_CAT_NAME },
new int[] { R.id.name });
setListAdapter(adapter);
} else {
ListAdapter adapter = new SimpleAdapter(
SubCategoryActivity.this, subcategoryList,
R.layout.activity_single_produt, new String[] {
TAG_PRODUCT_NAME, TAG_PRODUCT_DESCRIPTION,
TAG_PRODUCT_IMG }, new int[] {
R.id.product_label, R.id.product_desc,
R.id.iv_product_img });
setListAdapter(adapter);
}
}
}
}

try this:
if(jsonObj.has("name_of_the_field")){
//yes
}
or
JSONArray mJSONArray = jsonObj.optJSONArray("name of array");
the method optJSONArray("nameofarray") will return a null JSONArray if it could not find the JSONArray with provided name.

hmm there is one method to check if the key exists or not in json.
like if you have json array and you want to check if there is subcategory than
call method on that array object.

The JSONObject has method to check if the key exists in the JSON or not.
Quoting from the docs.
public boolean has (String name)
//Returns true if this object has a mapping for name. The mapping may be NULL.
You can find the official doc here

onResume() method on list view activity

I am working trying to solve an issue on an activity, but I am not able to find the reason for the behaviour.
I have a list view activity (Activity A), if the app user taps on a list row, a second list view activity (Activity B) is shown and all expected list objects are on the list.
Then, if the user navigates from activity B back to activity A, and selects the same or another row, then activity B is shown again, but none object is shown on the list.
I was told by another SO user to include a onResume method. I have done it, but the issue is not solved.
Here you have the activity B code:
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class ofertas_list extends ListActivity {
private ProgressDialog pDialog;
// JSON node keys
private static final String TAG_NAME = "nombreCategoria";
private static final String TAG_ID = "idCategoria";
private static final String TAG_CATEGORIAS = "Categorias";
// URL to get contacts JSON
private static String url = "http://xxxxx/android_ofertaslist.php?id=";
// JSON Node names
private static final String TAG_NOMBREEMPRESA = "nombreEmpresa";
private static final String TAG_IDEMPRESA = "idEmpresa";
private static final String TAG_DESCRIPCIONEMPRESA = "descripcionEmpresa";
private static final String TAG_STRIMAGEN = "strImagen";
private static final String TAG_DIRECCIONEMPRESA = "direccionEmpresa";
private static final String TAG_TELEFONOEMPRESA = "telefonoEmpresa";
private static final String TAG_FACEBOOKEMPRESA = "facebookEmpresa";
private static final String TAG_EMAILEMPRESA = "emailEmpresa";
private static final String TAG_TEXTOOFERTA = "textoOferta";
private static final String TAG_HORARIOEMPRESA = "horarioEmpresa";
private static final String TAG_CATEGORIAEMPRESA = "categoriaEmpresa";
private static final String TAG_LATITUDEMPRESA = "latitudEmpresa";
private static final String TAG_LONGITUDEMPRESA = "longitudEmpresa";
private static final String TAG_VALORACIONEMPRESA = "valoracionEmpresa";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
#Override
public void onResume(){
super.onResume();
new GetContacts().execute();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_categorias);
// getting intent data
Intent in = getIntent();
// JSON node keys
// Get JSON values from previous intent
String name = in.getStringExtra(TAG_NAME);
String email = in.getStringExtra(TAG_ID);
// URL to get contacts JSON
this.url = url+email;
this.setTitle(name);
contactList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
//cambiar por los nuevos campos
String name = ((TextView) view.findViewById(R.id.name))
.getText().toString();
String cost = ((TextView) view.findViewById(R.id.email))
.getText().toString();
//Starting single contact activity
//cambiar por los nuevos campos
Intent in = new Intent(getApplicationContext(),
SingleContactActivity.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_ID, cost);
startActivity(in);
}
});
// Calling async task to get json
//new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(ofertas_list.this);
pDialog.setMessage("Cargando datos...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_CATEGORIAS);
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String nombreEmpresa = c.getString(TAG_NOMBREEMPRESA);
String descripcionEmpresa = c.getString(TAG_DESCRIPCIONEMPRESA);
String strImagen = c.getString(TAG_STRIMAGEN);
String direccionEmpresa = c.getString(TAG_DIRECCIONEMPRESA);
String telefonoEmpresa = c.getString(TAG_TELEFONOEMPRESA);
String facebookEmpresa = c.getString(TAG_FACEBOOKEMPRESA);
String emailEmpresa = c.getString(TAG_EMAILEMPRESA);
String textoOferta = c.getString(TAG_TEXTOOFERTA);
String horarioEmpresa = c.getString(TAG_HORARIOEMPRESA);
String categoriaEmpresa = c.getString(TAG_CATEGORIAEMPRESA);
String valoracionEmpresa = c.getString(TAG_VALORACIONEMPRESA);
String latitudEmpresa = c.getString(TAG_LATITUDEMPRESA);
String longitudEmpresa = c.getString(TAG_LONGITUDEMPRESA);
String idEmpresa = c.getString(TAG_IDEMPRESA);
// Phone node is JSON Object
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_IDEMPRESA, idEmpresa);
contact.put(TAG_NOMBREEMPRESA, nombreEmpresa);
contact.put(TAG_DESCRIPCIONEMPRESA,descripcionEmpresa);
contact.put(TAG_STRIMAGEN,strImagen);
contact.put(TAG_DIRECCIONEMPRESA,direccionEmpresa);
contact.put(TAG_TELEFONOEMPRESA,telefonoEmpresa);
contact.put(TAG_FACEBOOKEMPRESA,facebookEmpresa);
contact.put(TAG_EMAILEMPRESA,emailEmpresa);
contact.put(TAG_TEXTOOFERTA,textoOferta);
contact.put(TAG_HORARIOEMPRESA,horarioEmpresa);
contact.put(TAG_CATEGORIAEMPRESA,categoriaEmpresa);
contact.put(TAG_VALORACIONEMPRESA,valoracionEmpresa);
contact.put(TAG_LATITUDEMPRESA,latitudEmpresa);
contact.put(TAG_LONGITUDEMPRESA,longitudEmpresa);
// adding contact to contact list
contactList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
ofertas_list.this, contactList,
R.layout.list_item_ofertas, new String[] { TAG_NOMBREEMPRESA, TAG_DIRECCIONEMPRESA}, new int[] { R.id.name,
R.id.email });
setListAdapter(adapter);
}
}
}
I am trying to solve the issue for two days but still no success. Please you are kindly requested to give me an advice on how to solve the issue.
CODE FOR ACTIVITY A:
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class categorias_list extends ListActivity {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "http://XXXX/android_categoriaslist.php";
// JSON Node names
private static final String TAG_NAME = "nombreCategoria";
private static final String TAG_ID = "idCategoria";
private static final String TAG_CATEGORIAS = "Categorias";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_categorias);
contactList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name))
.getText().toString();
String cost = ((TextView) view.findViewById(R.id.email))
.getText().toString();
//Starting single contact activity
Intent in = new Intent(getApplicationContext(),
ofertas_list.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_ID, cost);
startActivity(in);
}
});
// Calling async task to get json
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(categorias_list.this);
pDialog.setMessage("Cargando datos...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_CATEGORIAS);
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
// Phone node is JSON Object
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_ID, id);
contact.put(TAG_NAME, name);
// adding contact to contact list
contactList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
categorias_list.this, contactList,
R.layout.list_item, new String[] { TAG_NAME, TAG_ID}, new int[] { R.id.name,
R.id.email });
setListAdapter(adapter);
}
}
}
CODE FOR SERVICE HANDLER:
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class ServiceHandler {
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
public ServiceHandler() {
}
/**
* Making service call
* #url - url to make request
* #method - http request method
* */
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
/**
* Making service call
* #url - url to make request
* #method - http request method
* #params - http request params
* */
public String makeServiceCall(String url, int method,
List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
response = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return response;
}
}

You have to need maintain arraylist globalaly use
Adapter.notifyDatasetChanged(); for updating the list:

List view can be updated by updating your array adapt
YourArrayAdapterName.notifyDataSetChanged;
Above code must be added in your Activities onResume Method, Which is your firt activity for the List
Example:
#Override
protected void onResume() {
super.onResume();
yourAdapterName.notifyDataSetChanged();
// do other stuffs here.
}

list view parsing data to another activity using intent

I have a listview now i need to pass the listview data to a another activity how do i do it ?
MainActivity
package learn2crack.listview;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import java.util.List;
import android.view.Menu;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import learn2crack.listview.library.JSONParser;
public class MainActivity extends Activity {
ListView list;
TextView ver;
TextView name;
TextView api;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
private static String url = "http://216.185.116.35/LOGISTIC/WebServices/json/getDeliveriItems_bak.ashx?id=485";
private static final String TAG_OS = "android";
private static final String TAG_VER = "BagNumber";
private static final String TAG_NAME = "COD";
private static final String TAG_API = "OrderNo";
JSONArray android = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
oslist = new ArrayList<HashMap<String, String>>();
Btngetdata = (Button)findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
ver = (TextView)findViewById(R.id.vers);
name = (TextView)findViewById(R.id.name);
api = (TextView)findViewById(R.id.api);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
android = json.getJSONArray(TAG_OS);
for(int i = 0; i < android.length(); i++){
JSONObject c = android.getJSONObject(i);
String ver = c.getString(TAG_VER);
String name = c.getString(TAG_NAME);
String api = c.getString(TAG_API);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_VER, ver);
map.put(TAG_NAME, name);
map.put(TAG_API, api);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
listAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,R.layout.list_v,new String[] { TAG_VER,TAG_NAME, TAG_API }, new int[] {
R.id.vers,R.id.name, R.id.api});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
JSONParser.java
package learn2crack.listview.library;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
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.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
try {
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);
}
is.close();
json = sb.toString();
json = "{ \"android\":"+json+"}";
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jObj;
}
}
I have found some explanation how to pass data but I am having problem at new AdapterView.OnItemClickListener()

The problem is
oslist.get(+position)
should be
oslist.get(position)
Also you have
private static final String TAG_NAME = "COD"; // key for name is COD
map.put(TAG_NAME, name);
then
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String name = oslist.get(position).get("COD");
Intent intent = new Intent(ActivityName.this, YOURACTIVITY.class);
intent.putExtra("key", name);
startActivity(intent);
}
});
Should move setAdapter coe out of for loop
Also change to
#Override
protected void onPostExecute(JSONObject json) {
super.onPostExecute(json);
pDialog.dismiss();
try {
android = json.getJSONArray(TAG_OS);
for(int i = 0; i < android.length(); i++){
JSONObject c = android.getJSONObject(i);
String ver = c.getString(TAG_VER);
String name = c.getString(TAG_NAME);
String api = c.getString(TAG_API);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_VER, ver);
map.put(TAG_NAME, name);
map.put(TAG_API, api);
oslist.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
list=(ListView)findViewById(R.id.list);
listAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,R.layout.list_v,new String[] { TAG_VER,TAG_NAME, TAG_API }, new int[] {
R.id.vers,R.id.name, R.id.api});
list.setAdapter(adapter)
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String name = oslist.get(position).get("COD");
String ver = oslist.get(position).get(TAG_VER);
String api = oslist.get(position).get(TAG_API);
Intent intent = new Intent(MainActivity.this, AnotherActivity.class);
intent.putExtra("key", name);
intent.putExtra("key1", ver);
intent.putExtra("key2", api);
startActivity(intent);
}
});
}
In Another Activtiy
String name =getIntent().getStringExtra("key");
String api =getIntent().getStringExtra("key1");
String ver =getIntent().getStringExtra("key"2);

You should create a custom adapter. Also create a DataModel which will hold all the 3 values (Version, Name and Api). Make it Serializable.
public class MyModel implements Serializable{
private static final long serialVersionUID = 1L;
String version, name, api;
public MyModel(String modelVer, String modelName, String modelApi){
version = modelVer;
name = modelName ;
api = modelApi;
}
//Add Getters and Setters
}
Instead of creating HashMap<String, String> map = new HashMap<String, String>(); Create
ArrayList<MyModel> modelList = new ArrayList<MyModel>();
then in OnItemClickListener()
//To send data
MyModel modelToPass = modelList.get(position);
intent.putExtra("MyObject", modelToPass);
//To get data
getIntent().getSerializableExtra("MyObject");

for example you can pass the position of item that is clicked by below code
public void onListItemClick(ListView parent, View v, int position,
long id){
Intent intent = new Intent(getApplicationContext(), YourActivity.class);
intent.putExtra("pos", position);
startActivity(intent);
}
in YourActivity oncreate() method
Intent current=getIntent();
int position=current.getExtras().getInt("pos");
for sending your data you can make class below
public class Information implements Serializable {
public String BagNumber;
public String COD;
public String OrderNo;
public String SubOrderNo;
......
......
}
and for send it
Information details = new Information ();
details.BagNumber = "";
details.COD = "12";
details.OrderNo = "ff";
....
....
Intent i = new Intent(getApplicationContext(), YourActivity.class);
i.putExtra("inf", details);
startActivity(i);
For receive it
Information model = (Information ) getIntent().getSerializableExtra("inf");

I am doing everything in background using doInBackground() where to use onPostExecute()

I am trying to show JSON data into Mapview, but always getting blank map.
I knew that to populate I need to use onPostExecute() in my activity but I am confuse where I need to put onPostExecute() method and what are the lines I need to place in that.
Please someone make these changes, below I have written my code, advance thanks to viewers and readers
JSON Data:-
{
"maps": [
{
"title": "Place One",
"latitude" : "46.483742",
"longitude" : "7.663157",
"country": "Switzerland"
},
{
"title" : "Place Two",
"latitude" : "59.25235",
"longitude" : "18.465536",
"country" : "Sweden"
},
{
"title" : "Place Three",
"latitude" : "56.404182",
"longitude" : "-3.818855",
"country" : "Scotland"
}
]
}
Activity Code:-
mapOverlays = mapView.getOverlays();
drawable = getResources().getDrawable(R.drawable.ic_launcher);
itemizedOverlay = new SimpleItemizedOverlay (drawable, mapView);
itemizedOverlay.setShowClose(false);
itemizedOverlay.setShowDisclosure(true);
itemizedOverlay.setSnapToCenter(false);
class DownloadWebPageTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
HttpClient client = new DefaultHttpClient();
// Perform a GET request for a JSON list
HttpUriRequest request = new HttpGet("https://dl.***.com/maps.json");
// Get the response that sends back
HttpResponse response = null;
try {
response = client.execute(request);
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Convert this response into a readable string
String jsonString = null;
try {
jsonString = StreamUtils.convertToString(response.
getEntity().getContent());
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Create a JSON object that we can use from the String
JSONObject json = null;
try {
json = new JSONObject(jsonString);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try{
JSONArray jsonArray = json.getJSONArray("maps");
Log.e("log_tag", "Opening JSON Array ");
for
(int i=0;i < jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String latitude = jsonObject.getString("latitude");
String longitude = jsonObject.getString("longitude");
String title = jsonObject.getString("title");
String country = jsonObject.getString("country");
double lat = Double.parseDouble(latitude);
double lng = Double.parseDouble(longitude);
Log.e("log_tag", "ADDING GEOPOINT"+title);
point = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
OverlayItem overlayItem = new OverlayItem(point, title,
country);
itemizedOverlay.addOverlay(overlayItem);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
itemizedOverlay.populateNow();
mapOverlays.add(itemizedOverlay);
if (savedInstanceState == null) {
MapController controller = mapView.getController();
controller.setCenter(point);
controller.setZoom(7);
} else {
// example restoring focused state of overlays
int focused;
focused = savedInstanceState.getInt("focused_1", -1);
if (focused >= 0) {
itemizedOverlay.setFocus
(itemizedOverlay.getItem(focused));
}
}
return jsonString; }
}
}

I understand your problem, the following code is how to get the json data and showing in a listview. It is helpful for you to show when you will write the PostExecute Method. you have to set the overlay items in PostExecute method.
package com.androidhive.jsonparsing;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
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.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "http://api.androidhive.info/contacts/";
// JSON Node names
private static final String TAG_CONTACTS = "contacts";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";
private static final String TAG_ADDRESS = "address";
private static final String TAG_GENDER = "gender";
private static final String TAG_PHONE = "phone";
private static final String TAG_PHONE_MOBILE = "mobile";
private static final String TAG_PHONE_HOME = "home";
private static final String TAG_PHONE_OFFICE = "office";
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// contacts JSONArray
JSONArray contacts = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new GetEventsTask().execute("");
}
protected class GetEventsTask extends
AsyncTask<String, Integer, ArrayList<HashMap<String, String>>> {
protected ArrayList<HashMap<String, String>> contactList;
private final ProgressDialog dialog = new ProgressDialog(
AndroidJSONParsingActivity.this);
//PreExecute Method
protected void onPreExecute() {
this.dialog.setMessage("Loading, Please Wait..");
this.dialog.setCancelable(false);
this.dialog.show();
}
//doInBackground Method
#Override
protected ArrayList<HashMap<String, String>> doInBackground(
String... params) {
contactList = new ArrayList<HashMap<String, String>>();
// 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();
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 (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
Log.i("json objects",""+json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
try {
// Getting Array of Contacts
contacts = jObj.getJSONArray(TAG_CONTACTS);
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String email = c.getString(TAG_EMAIL);
String address = c.getString(TAG_ADDRESS);
String gender = c.getString(TAG_GENDER);
// Phone number is agin JSON Object
JSONObject phone = c.getJSONObject(TAG_PHONE);
String mobile = phone.getString(TAG_PHONE_MOBILE);
String home = phone.getString(TAG_PHONE_HOME);
String office = phone.getString(TAG_PHONE_OFFICE);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_EMAIL, email);
map.put(TAG_PHONE_MOBILE, mobile);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return contactList;
}
//onPostExecute Method
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
// selecting single ListView item
ListView lv = getListView();
ListAdapter adapter = new SimpleAdapter(getApplicationContext(),
contactList, R.layout.list_item, new String[] { TAG_NAME,
TAG_EMAIL, TAG_PHONE_MOBILE }, new int[] {
R.id.name, R.id.email, R.id.mobile });
lv.setListAdapter(adapter);
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name))
.getText().toString();
String cost = ((TextView) view.findViewById(R.id.email))
.getText().toString();
String description = ((TextView) view
.findViewById(R.id.mobile)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
SingleMenuItemActivity.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_EMAIL, cost);
in.putExtra(TAG_PHONE_MOBILE, description);
startActivity(in);
}
});
//Dismiss the dialog
if (this.dialog.isShowing()) {
this.dialog.dismiss();
}
}
}
}

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The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Need help on JSON parsing - android

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