Develop Reference

Parsing JSON Android?

I am trying to create JSON parser using Android Java. I am new person for developing android JAVA. I need to parse Username and Password to get some actions, like login activity. below nested parameters I want to use and If url and validation success, I will get below mentioned response. Below mentioned urls to parse parameters.Please help me!
http://sample.com/login/username/ <username> /password <password>?
{
"response":{
"School":"SBOA",
"Name":"Anitha",
"Class":"Tenth",
},
"Result":"Good",
}
Below Code I am trying:
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
/**
*
* Login Activity Class
*
*/
public class LoginActivity extends Activity {
// Progress Dialog Object
ProgressDialog prgDialog;
// Error Msg TextView Object
TextView errorMsg;
// Email Edit View Object
EditText emailET;
// Passwprd Edit View Object
EditText pwdET;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
// Find Error Msg Text View control by ID
//errorMsg = (TextView)findViewById(R.id.login_error);
// Find Email Edit View control by ID
emailET = (EditText)findViewById(R.id.email);
// Find Password Edit View control by ID
pwdET = (EditText)findViewById(R.id.password);
// Instantiate Progress Dialog object
prgDialog = new ProgressDialog(this);
// Set Progress Dialog Text
prgDialog.setMessage("Please wait...");
// Set Cancelable as False
prgDialog.setCancelable(false);
}
/**
* Method gets triggered when Login button is clicked
*
* #param view
*/
public void loginUser(View view){
navigatetoHomeActivity();
// Get Email Edit View Value
String email = emailET.getText().toString();
// Get Password Edit View Value
String password = pwdET.getText().toString();
// Instantiate Http Request Param Object
RequestParams usernames = new RequestParams();
RequestParams passwords = new RequestParams();
// When Email Edit View and Password Edit View have values other than Null
if(Utility.isNotNull(email) && Utility.isNotNull(password)){
// When Email entered is Valid
if(Utility.validate(email)){
// Put Http parameter username with value of Email Edit View control
usernames.put("username", email);
// Put Http parameter password with value of Password Edit Value control
passwords.put("password", password);
// Invoke RESTful Web Service with Http parameters
invokeWS(usernames);
invokeWS(passwords);
}
// When Email is invalid
else{
Toast.makeText(getApplicationContext(), "Please enter valid email", Toast.LENGTH_LONG).show();
}
} else{
Toast.makeText(getApplicationContext(), "Please fill the form, don't leave any field blank", Toast.LENGTH_LONG).show();
}
}
/**
* Method that performs RESTful webservice invocations
*
* #param usernames
*/
public void invokeWS(final RequestParams usernames){
// Show Progress Dialog
prgDialog.show();
// Make RESTful webservice call using AsyncHttpClient object
AsyncHttpClient client = new AsyncHttpClient();
client.get("URL" ,params,new AsyncHttpResponseHandler() {
// When the response returned by REST has Http response code '200'
#Override
public void onSuccess(String response) {
// Hide Progress Dialog
prgDialog.hide();
try {
// JSON Object
JSONObject obj = new JSONObject(response);
// When the JSON response has status boolean value assigned with true
if(obj.getBoolean("response")){
Toast.makeText(getApplicationContext(), "You are successfully logged in!", Toast.LENGTH_LONG).show();
// Navigate to Home screen
navigatetoHomeActivity();
}
// Else display error message
else{
errorMsg.setText(obj.getString("error_msg"));
Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
// When the response returned by REST has Http response code other than '200'
#Override
public void onFailure(int statusCode, Throwable error,
String content) {
// Hide Progress Dialog
prgDialog.hide();
// When Http response code is '404'
if(statusCode == 404){
Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
}
// When Http response code is '500'
else if(statusCode == 500){
Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
}
// When Http response code other than 404, 500
else{
Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
}
}
});
}
/**
* Method which navigates from Login Activity to Home Activity
*/
public void navigatetoHomeActivity(){
Intent homeIntent = new Intent(getApplicationContext(),WatchListActivity.class);
homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(homeIntent);
}

use this code to get json from url.
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.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
//name value pairs for posting username and password
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username","john"));
params.add(new BasicNameValuePair("password","123"));
httpPost .setEntity(new UrlEncodedFormEntity(params));
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 JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
in your activity call this json parser with your url in an AsyncTask.
after getting json data learn some basics of json from w3schools
view complete code here

I suggest you to read Gson tutorial for making json strings and use Volley libary to make request and response.

Webpage login error-Android App

I'm new to Android and Java. I'm creating an app to login to my ISP. This is the page: http://reliancebroadband.co.in/reliance/login.do
Earlier, I was using a python script, which worked flawlessly. Its like this:
#!/usr/bin/env python
# encoding: utf-8
import urllib2, urllib, cookielib
username = 'my-username'
password = 'my-password'
jar = cookielib.FileCookieJar("cookies")
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(jar))
response = opener.open("http://reliancebroadband.co.in/reliance/startportal_isg.do")
login_data = urllib.urlencode({'userId' : username, 'password' : password, 'action' : 'doLoginSubmit'})
resp = opener.open('http://reliancebroadband.co.in/reliance/login.do', login_data)
And now i'm trying to create an android app(source: http://www.compiletimeerror.com/2013/01/login-application-for-android.html#.U7AFBPmSz9Y) (Tried contacting the developer there, but he's not responding.)
The app is compiling correctly, but while tring to login, its just returning the source code of the login page in the error dialogue, instead of logging in.
Here's the code:
MainActivity.java:
package com.app.reliancebblogin;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
#SuppressLint("NewApi")
public class MainActivity extends Activity
{
EditText un, pw;
TextView error;
Button ok;
private String resp;
private String errorMsg;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
un = (EditText) findViewById(R.id.et_un);
pw = (EditText) findViewById(R.id.et_pw);
ok = (Button) findViewById(R.id.btn_login);
error = (TextView) findViewById(R.id.tv_error);
ok.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
/** According with the new StrictGuard policy, running long tasks on the Main UI thread is not possible
So creating new thread to create and execute http operations */
new Thread(new Runnable()
{
#Override
public void run()
{
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("username",un.getText().toString()));
postParameters.add(new BasicNameValuePair("password",pw.getText().toString()));
String response = null;
try
{
response = SimpleHttpClient.executeHttpPost("http://reliancebroadband.co.in/reliance/login.do", postParameters);
String res = response.toString();
resp = res.replaceAll("\\s+", "");
}
catch (Exception e)
{
e.printStackTrace();
errorMsg = e.getMessage();
}
}
}).start();
try
{
/** wait a second to get response from server */
Thread.sleep(1000);
/** Inside the new thread we cannot update the main thread
So updating the main thread outside the new thread */
error.setText(resp);
if (null != errorMsg && !errorMsg.isEmpty())
{
error.setText(errorMsg);
}
}
catch (Exception e)
{
error.setText(e.getMessage());
}
}
});
}
}
SimpleHttpClient.java:
package com.app.reliancebblogin;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
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.conn.params.ConnManagerParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
public class SimpleHttpClient
{
/** The time it takes for our client to timeout */
public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds
/** Single instance of our HttpClient */
private static HttpClient mHttpClient;
/**
* Get our single instance of our HttpClient object.
*
* #return an HttpClient object with connection parameters set
*/
private static HttpClient getHttpClient()
{
if (mHttpClient == null)
{
mHttpClient = new DefaultHttpClient();
final HttpParams params = mHttpClient.getParams();
HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
}
return mHttpClient;
}
/**
* Performs an HTTP Post request to the specified url with the
* specified parameters.
*
* #param url The web address to post the request to
* #param postParameters The parameters to send via the request
* #return The result of the request
* #throws Exception
*/
public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception
{
BufferedReader in = null;
try
{
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
request.setEntity(formEntity);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null)
{
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
}
finally
{
if (in != null)
{
try
{
in.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP GET request to the specified url.
*
* #param url The web address to post the request to
* #return The result of the request
* #throws Exception
*/
public static String executeHttpGet(String url) throws Exception
{
BufferedReader in = null;
try
{
HttpClient client = getHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null)
{
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
}
finally
{
if (in != null)
{
try
{
in.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
}
}

the variable from php won't show up on android (using json)

I'm trying to make an android app using fuzzy (have yet to make the whole fuzzy calculation) so the calculations will be done in php. For starter I was just making a simple calculation in php first and trying to send to the android. but it doesn't show anything..there no error either.
Here's the simple example of my php code calc.php
<?php
$calcresult = 56 * 100 * 2051 / 49;
echo json_encode($calcresult);
?>
and this is my java code JSONActivity.class
package com.example.ta2;
import java.io.BufferedReader;
import java.io.InputStream;import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class AturanKonsumsi extends Activity {
private JSONObject jObject;
private String xResult ="";
private String url = "http://10.0.2.2/calc.php";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.daftarmakanan);
TextView txtResult = (TextView)findViewById(R.id.TextViewResult);
xResult = getRequest(url);
try {
parse(txtResult);
} catch (Exception e) {
e.printStackTrace();
}
}
private void parse(TextView txtResult) throws Exception {
jObject = new JSONObject(xResult);
JSONArray menuitemArray = jObject.getJSONArray("calcresult");
String sret="";
for (int i = 0; i < menuitemArray.length(); i++) {
System.out.println(menuitemArray.getJSONObject(i)
.getString("calcresult").toString());
sret +=menuitemArray.getJSONObject(i).getString(
"calcresult").toString()+"\n";
}
txtResult.setText(sret);
}
public String getRequest(String Url){
String sret="";
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(Url);
try{
HttpResponse response = client.execute(request);
sret =request(response);
}catch(Exception ex){
Toast.makeText(this,"Gagal "+sret, Toast.LENGTH_SHORT).show();
}
return sret;
}
public static String request(HttpResponse response){
String result = "";
try{
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null){
str.append(line + "\n");
}
in.close();
result = str.toString();
}catch(Exception ex){
result = "Error";
}
return result;
}
}
when I run the android app it doesn't show the value in $calcresult and there's no error either. thanks for your help

calcresult is not referenced by the json your php script is producing. Check the output. To make your java code work, you'll need to create the json like so:
<?php
$calcresult = 56 * 100 * 2051 / 49;
$json = array( 'calcresult' => array( $calcresult ) );
echo json_encode($json);
?>
Alternately, you can simplify your java.

Problems parsing JSON data

I have searched for solutions for a day and cannot find one that applies for my situation. I am sorry but I am new to JSON (self taught programmer) and I don't know what classes should I only post, so I will put in everything I have. I am getting the following error from LogCat:
Error parsing data org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONArray
Here is my class:
package com.example.mytravelbuddy;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.util.Log;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class Itinerary extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
//JSON Parser
JSONParser jParser = new JSONParser();
//URL To Get Products
public static String url = "URL REMOVED"; //Removed my url since i was hosting online
//JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_ITEMS = "items";
private static final String TAG_ID = "ID";
private static final String TAG_LOCATION = "Location";
private static final String TAG_DESCRIPTION = "Description";
private static final String TAG_LATITUDE = "Latitude";
private static final String TAG_LONGITUDE = "Longitude";
private static final String TAG_TIME = "Time";
//Array list
ArrayList<HashMap<String, String>> itemList;
//Items JSONArray
JSONArray items = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_point);
itemList = new ArrayList<HashMap<String, String>>();
new LoadAllItems().execute();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.starting_point, menu);
return true;
}
class LoadAllItems extends AsyncTask<String, String, String>{
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Itinerary.this);
pDialog.setMessage("Loading items. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected String doInBackground(String... arg0) {
//Building Params
List<NameValuePair> params = new ArrayList<NameValuePair>();
//Getting JSON String
JSONObject json = jParser.makeHttpRequest(url, "GET", params);
try{
//Getting array of items
Log.i("Error","ERROR 1"); //This error message is displayed
items = json.getJSONArray(TAG_ITEMS); //This is the line that is giving me a problem
Log.i("Error","ERROR 2"); //This error message is not displayed
//Looping through
for(int i = 0; i < items.length();i++){
JSONObject c = items.getJSONObject(i);
//Storing JSON item in variable
String location = c.getString(TAG_LOCATION);
String description = c.getString(TAG_DESCRIPTION);
String longitude = c.getString(TAG_LONGITUDE);
String latitude = c.getString(TAG_LATITUDE);
String time = c.getString(TAG_TIME);
//Creating HashMap
HashMap<String, String> map = new HashMap<String, String>();
//Put value in hashmap map
map.put(TAG_LOCATION, location);
map.put(TAG_DESCRIPTION, description);
map.put(TAG_LONGITUDE, longitude);
map.put(TAG_LATITUDE, latitude);
map.put(TAG_TIME, time);
itemList.add(map);
}
}catch(JSONException e){
e.printStackTrace();
}
return null;
}}
}
I found in which line I am getting the error by displaying error messages in LogCat.
Here is my PHP file that I am trying to get response from:
<?php
$user = "root";
$pass = "";
$database = "travel_buddy";
$server = "127.0.0.1";
mysql_connect($server, $user, $pass);
$db_found = mysql_select_db($database);
if($db_found){
echo"DB Found<br>";
}else{
echo"DB NOT Found<br>";
}
echo"Connection Established<br>";
get_details();
function get_details(){
$response = array();
$result = mysql_query("SELECT *FROM adventure");
if(mysql_num_rows($result)>0){
$response["items"] = array();
while($row = mysql_fetch_array($result)){
$info = array();
$product["ID"] = $row["ID"];
$product["Location"] = $row["Location"];
$product["Description"] = $row["Description"];
$product["Latitude"] = $row["Latitude"];
$product["Longitude"] = $row["Longitude"];
$product["Time"] = $row["Time"];
array_push($response["items"], $product);
}
$response["success"] = 1;
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "No Information Found";
echo json_encode($response);
}
}
?>
Here is my JSON Response:
{
"items": [
{
"ID": "1",
"Location": "TEST",
"Description": "TEST DESC",
"Latitude": "1",
"Longitude": "2",
"Time": "3:00"
},
{
"ID": "2",
"Location": "TEST2",
"Description": "TEST2 DESC",
"Latitude": "1",
"Longitude": "1",
"Time": "7:00"
},
{
"ID": "3",
"Location": "TEST3",
"Description": "TEST3 DESC",
"Latitude": "3",
"Longitude": "4",
"Time": "12:00"
}
],
"success": 1
}
Here is my JSON Parser Class:
package com.example.mytravelbuddy;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
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 JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
Any help would be really helpful, possible explaining why I have this error so I don't repeat it again.

The php page is echoing other strings instead of json(only).

I strongly recommend using Gson to parse your JSON response.
For the example above the class would look like this:
public class ItemList {
List<Item> items;
}
and Item would be:
public class Item {
private String ID;
private String Location;
private String Description;
private String Longitude;
private String Latitude;
private String Time;
}
Then, parsing becomes absolutely trivial. Put gson-2.2.4.jar in your libs folder, and then just do this:
Gson GSON = new Gson();
ItemList itemList = GSON.fromJson(json_string_here, ItemList.class);
That's it. You have a first class java object parsed from JSON. Easy and powerful.

This can cause problem
mysql_connect($server, $user, $pass);
$db_found = mysql_select_db($database);
if($db_found){
echo"DB Found<br>";
}else{
echo"DB NOT Found<br>";
}
echo"Connection Established<br>";
your service is echoing other things.
It should only be echo'ing the JSON.
Instead such information could be logged
mysql_connect($server, $user, $pass);
$db_found = mysql_select_db($database);
if($db_found){
error_log("DB Found<br>");
}else{
error_log("DB NOT Found<br>)";
}
error_log("Connection Established<br>");
Also the header is important to have:
header("Content-Type: application/json");
Place it at the top of your script.
EDIT:
I just tried your code, and I can parse the JSON without error.
Most likely your PHP server is sending XML for some reason. You need to check that script again.
It could even be error reporting messing your encoded json, Log any error but only echo the JSON .
Hope this helps.

send a variable from java client to php server via Json

I am a beginner in both Java and PHP
I am working on an app that has 2 part:
Android client(Java) both and PHP server.
I tried many of the available tutorials and read about mistakes users made but failed to succeed in any!
This is one of the tutorials I am using:
Java File
package org.postandget;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
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.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Main extends Activity {
TextView tv;
String text;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView)findViewById(R.id.textview);
text = "";
try {
postData();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void postData() throws JSONException{
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/ReceiveLocation.php");
JSONObject json = new JSONObject();
try {
// JSON data:
json.put("name", "Fahmi Rahman");
json.put("position", "sysdev");
JSONArray postjson=new JSONArray();
postjson.put(json);
// Post the data:
httppost.setHeader("json",json.toString());
httppost.getParams().setParameter("jsonpost",postjson);
// Execute HTTP Post Request
System.out.print(json);
HttpResponse response = httpclient.execute(httppost);
// for JSON:
if(response != null)
{
InputStream is = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
text = sb.toString();
}
tv.setText(text);
}catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
this is the php file
<?php
include('ConnectionFunctions.php');
Connection();
$json = $_POST['jsonpost'];
echo "JSON: \n";
echo "--------------\n";
var_dump($json);
echo "\n\n";
$data = json_decode($json);
echo "Array: \n";
echo "--------------\n";
var_dump($data);
echo "\n\n";
$name = $data->name;
$pos = $data->position;
echo "Result: \n";
echo "--------------\n";
echo "Name : ".$name."\n Position : ".$pos;
?>
this is the error that appears when i run the php
Notice: Undefined index: HTTP_JSON in C:\xampp\htdocs\ReceiveLocation.php on line 5
JSON: -------------- NULL Array: -------------- NULL
Notice: Trying to get property of non-object in C:\xampp\htdocs\ReceiveLocation.php on line 17
Notice: Trying to get property of non-object in C:\xampp\htdocs\ReceiveLocation.php on line 18
Result: -------------- Name : Position :

Access the JSON data using:
$json = $_POST['jsonpost'];

You were trying to access an invalid field in your php file, it should have been
$json = $_POST['jsonpost'];
OR
$json = $_REQUEST['jsonpost'];
Remember to also sterilize your data from bad input in your php file if you plan to do database work with the data. ALso maybe your localhost path should be changed from
HttpPost httppost = new HttpPost("http://127.0.0.1/ReceiveLocation.php");
TO
HttpPost httppost = new HttpPost("http://10.0.2.2/ReceiveLocation.php");
Hope i helped.

You have a Problem with your code, JSON Data is only added to the header and not to the POST Section of HTTP Request.
So when you output:
print_r(getallheaders());
$headers = getallheaders();
$json = json_decode($headers['json']);
print_r($json);
You should see your data. I right now have not a fix, but i am working on it.