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error parsing data from mysql database

I am developing an android application. I'm trying to get data from a mysql database and I keep getting this error. Can't seem to figure out what is wrong. Here is my code and my logs.
Log:
02-02 17:00:40.289 89-89/system_process W/InputManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy#41993f60
02-02 17:00:48.338 1039-1056/com.example.busscheduledatarecorder E/My Error: Error D
02-02 17:00:48.461 1039-1056/com.example.busscheduledatarecorder E/My Error: Error D
02-02 17:01:05.339 1039-1056/com.example.busscheduledatarecorder E/response string: [ 02-02 17:01:05.762 1039:0x420 E/JSON Parser ]
Error parsing data org.json.JSONException: End of input at character 1 of
02-02 17:01:06.228 1039-1039/com.example.busscheduledatarecorder D/AndroidRuntime: Shutting down VM
02-02 17:01:06.265 1039-1039/com.example.busscheduledatarecorder W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-02 17:01:06.398 1039-1039/com.example.busscheduledatarecorder E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.busscheduledatarecorder.MainActivity$Load_Routes.onPostExecute(MainActivity.java:407)
at com.example.busscheduledatarecorder.MainActivity$Load_Routes.onPostExecute(MainActivity.java:375)
at android.os.AsyncTask.finish(AsyncTask.java:602)
at android.os.AsyncTask.access$600(AsyncTask.java:156)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
02-02 17:01:06.534 89-473/system_process W/ActivityManager: Force finishing activity com.example.busscheduledatarecorder/.MainActivity
PHP code:
<?php
$response = array();
$response["success"] = 0;
$response["message"] = "No routes found";
// include db connect class
include('db.php');
// connecting to db
$db = new DB_CONNECT();
// get all routes from route table
$result = mysql_query("SELECT * FROM route");
// check for empty result
if ($result && mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["routes"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$route = array();
$route["busRouteId"] = $row["busRouteId"];
$route["routeName"] = $row["routeName"];
// push single product into final response array
array_push($response["routes"], $route);
}
// success
$response["success"] = 1;
}
// Echo JSON anyway!
echo json_encode($response);
die();
?>
Java Code:
public class JSONParser {
String result = null;
DBHelper db;
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public JSONParser() {}
public JSONObject 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();
Log.e("My Error", "Error A " + e.toString());
} catch (ClientProtocolException e) {
e.printStackTrace();
Log.e("My Error", "Error B " + e.toString());
} catch (IOException e) {
e.printStackTrace();
Log.e("My Error", "Error C " + e.toString());
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "ISO-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
Log.e("My Error", "Error D ");
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
Log.e("My Error", "Error D ");
}
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 {
Log.e("response string",json);
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}}
MainActivity:
public class MainActivity extends Activity {
DBHelper db;
int routeloadsuccess;
JSONArray jArray = null
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinroute= (Spinner)findViewById(R.id.spinnerroute);
pb = (ProgressBar) findViewById(R.id.progressBar);
pb.setVisibility(View.INVISIBLE);
db = new DBHelper(this);
}
public void shout(String voice)
{Toast.makeText(this, voice,Toast.LENGTH_LONG).show();}
public void insertNewRoutes(int id, String routename){
//check if route exists
boolean exists = db.checkRouteforId(id), result = false;
if(exists)
{
result = db.updateRoute(id, routename);
}
else{ result = db.insertRoute(id, routename);}
if(result){routeloadsuccess = 1;}
}
private class Load_Routes extends AsyncTask<String, String, JSONObject>{
InputStream is;
String url;
private static final String TAG_ROUTE = "bus_route";
public Load_Routes()
{
is = null;
url = "http://busscheduledata.com/RouteMobile.php";
}
#Override
protected JSONObject doInBackground(String... arg0) {
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
shout("Loading Routes...");
pb.setVisibility(View.VISIBLE);
}
#Override
protected void onPostExecute(JSONObject json) {
// TODO Auto-generated method stub
pb.setVisibility(View.INVISIBLE);
try {
// Getting JSON Array
int success = json.getInt("success");
if (success == 1) {
JSONArray JAStuff = json.getJSONArray("response");
/** CHECK THE NUMBER OF RECORDS **/
int intStuff = JAStuff.length();
if (intStuff != 0) {
for (int i = 0; i < JAStuff.length(); i++) {
JSONObject JOStuff = JAStuff.getJSONObject(i);
Log.e("ALL THE STUFF", JOStuff.toString());
// Storing JSON item in a Variable
int routeid = JOStuff.getInt("busRouteId");
String routename = JOStuff.getString("routeName");
//Set JSON Data in spinner
insertNewRoutes(routeid,routename );
}
}
}
} catch (JSONException e) {
e.printStackTrace();
shout("Loading failed");
}
}
}//end of loading route thingy
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
populateMenu(menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
applyMenuChoice(item);
return(applyMenuChoice(item) ||super.onOptionsItemSelected(item));
}
private void populateMenu(Menu menu) {
menu.add(0, SIXTEEN_ID, 0, "Get Routes");
}
private boolean applyMenuChoice(MenuItem item) {
Intent intent;
switch (item.getItemId())
{
case SIXTEEN_ID:
db.deleteAllRoutes();
Load_Routes lr = new Load_Routes();
lr.execute();
if(routeloadsuccess == 1){
shout("Loading Complete");
intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);}
return(true);
//break;
}
return true ;
}
}

Log.e("response string",json);
This line is printing: E/response string: n
Your response is "n" which is String. In the next line you are converting it into a JsonObject which will definitely throw the exception.
jObj = new JSONObject(json);
Change the response from server from String to Json

NullPointerException error in android with json

I know there are many great explanations in StackOverFlow regarding this error. But I have spent countless hours trying to solve this error in my code but I couldn't. I am new to android programming. Hopefully you guys can help.
I am trying to store data in MySQL using PHP in this android app.
Here is my MainActivity
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
private EditText userName, userContact, userAddress, userRequest;
private Spinner userStore;
private Button mRegister;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script
//localhost :
//testing on your device
//put your local ip instead, on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL = "http://xxx.xxx.x.x:1234/webservice/register.php";
//testing on Emulator:
private static final String LOGIN_URL = "http://10.0.2.2/callarocket/register.php";
//testing from a real server:
//private static final String LOGIN_URL = "http://www.yourdomain.com/webservice/register.php";
//ids
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner dropdown = (Spinner)findViewById(R.id.StoreSpinner);
String[] items = new String[]{"NZ Mamak", "Indo Shop", "NZ Supermarket"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, items);
dropdown.setAdapter(adapter);
userName = (EditText)findViewById(R.id.EditName);
userContact = (EditText)findViewById(R.id.EditContact);
userAddress = (EditText)findViewById(R.id.EditAddress);
userStore = (Spinner)findViewById(R.id.StoreSpinner);
userRequest = (EditText)findViewById(R.id.EditRequest);
mRegister = (Button)findViewById(R.id.SubmitButton);
mRegister.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
new CreateUser().execute();
}
class CreateUser extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Creating Request...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String username = userName.getText().toString();
String usercontact = userContact.getText().toString();
String useraddress = userAddress.getText().toString();
String userstore = userStore.getSelectedItem().toString();
String userrequest = userRequest.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("userName", username));
params.add(new BasicNameValuePair("userContact", usercontact));
params.add(new BasicNameValuePair("userAddress", useraddress));
params.add(new BasicNameValuePair("userStore", userstore));
params.add(new BasicNameValuePair("userRequest", userrequest));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// full json response
Log.d("Login attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("User Created!", json.toString());
finish();
return json.getString(TAG_MESSAGE);
}else{
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(MainActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
Here is my JSONParser.java
public class JSONParser {
static InputStream is = null ;
static JSONObject jObj = null ;
static String json = " " ;
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(final String url) {
// Making HTTP request
try {
// Construct the client and the HTTP request.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
// Execute the POST request and store the response locally.
HttpResponse httpResponse = httpClient.execute(httpPost);
// Extract data from the response.
HttpEntity httpEntity = httpResponse.getEntity();
// Open an inputStream with the data content.
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
// Create a BufferedReader to parse through the inputStream.
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
// Declare a string builder to help with the parsing.
StringBuilder sb = new StringBuilder();
// Declare a string to store the JSON object data in string form.
String line = null;
// Build the string until null.
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
// Close the input stream.
is.close();
// Convert the string builder data to an actual string.
json = sb.toString();
//Log.i("DATA","json data is :: "+json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// Try to parse the string to a JSON object
try {
jObj = new JSONObject(json);
//jarr = new JSONArray(json);
//jObj = jarr.getJSONObject(0);
//JSONParser parser = new JSONParser();
//Object obj = parser.parse(json);
//JSONObject jsonObj = (JSONObject) obj;
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// Return the JSON Object.
return jObj;
}
// 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;
}
}
The full logcat
02-25 14:13:43.070 2708-2725/com.example.user.callarocket D/request!﹕ starting
02-25 14:13:43.132 2708-2723/com.example.user.callarocket W/EGL_emulation﹕ eglSurfaceAttrib not implemented
02-25 14:13:43.132 2708-2723/com.example.user.callarocket W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa6c46c20, error=EGL_SUCCESS
02-25 14:13:43.318 2708-2725/com.example.user.callarocket E/JSON Parser﹕ Error parsing data org.json.JSONException: Value Posted of type java.lang.String cannot be converted to JSONObject
02-25 14:13:43.318 2708-2725/com.example.user.callarocket E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
Process: com.example.user.callarocket, PID: 2708
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.toString()' on a null object reference
at com.example.user.callarocket.MainActivity$CreateUser.doInBackground(MainActivity.java:129)
at com.example.user.callarocket.MainActivity$CreateUser.doInBackground(MainActivity.java:86)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
02-25 14:13:45.643 2708-2708/com.example.user.callarocket E/WindowManager﹕ android.view.WindowLeaked: Activity com.example.user.callarocket.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{279ba229 V.E..... R......D 0,0-1026,348} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:363)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:261)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:298)
at com.example.user.callarocket.MainActivity$CreateUser.onPreExecute(MainActivity.java:100)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.example.user.callarocket.MainActivity.onClick(MainActivity.java:82)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

application crashes when i want to registering (java)

I need help in my application. In that application I want to do login and registration but whenever I press the login and register buttons, it crash the whole application. I'm using xampp as server.
RegisterActivity.java
protected EditText mUsername;
protected EditText mUserEmail;
protected EditText mUserPassword;
protected Button mRegisterButton;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script
//localhost :
//testing on your device
//put your local ip instead, on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL = "http://xxx.xxx.x.x:1234/webservice/register.php";
//testing on Emulator:
private static final String LOGIN_URL = "http://127.0.0.1/webservice/register.php";
//testing from a real server:
//private static final String LOGIN_URL = "http://www.yourdomain.com/webservice/register.php";
//ids
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
//initialize
mUsername = (EditText)findViewById(R.id.usernameRegisterEditText);
mUserEmail = (EditText)findViewById(R.id.emailRegisterEditText);
mUserPassword = (EditText)findViewById(R.id.passwordRegisterEditText);
mRegisterButton = (Button)findViewById(R.id.registerButton);
//listen to register button click
mRegisterButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
new CreateUser().execute();
}
class CreateUser extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
//boolean failure = false;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(RegisterActivity.this);
pDialog.setMessage("Creating User...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String username = mUsername.getText().toString();
String email = mUserEmail.getText().toString();
String password = mUserPassword.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// full json response
Log.d("Login attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("User Created!", json.toString());
finish();
return json.getString(TAG_MESSAGE);
}else{
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(RegisterActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
JSONParser
------------
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(final String url) {
// Making HTTP request
try {
// Construct the client and the HTTP request.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
// Execute the POST request and store the response locally.
HttpResponse httpResponse = httpClient.execute(httpPost);
// Extract data from the response.
HttpEntity httpEntity = httpResponse.getEntity();
// Open an inputStream with the data content.
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
// Create a BufferedReader to parse through the inputStream.
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
// Declare a string builder to help with the parsing.
StringBuilder sb = new StringBuilder();
// Declare a string to store the JSON object data in string form.
String line = null;
// Build the string until null.
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
// Close the input stream.
is.close();
// Convert the string builder data to an actual string.
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// Try to 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 the JSON Object.
return jObj;
}
// 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;
}
}
AndroidManifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="sergio.applicationone"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".LoginActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".HomepageActivity"
android:label="HomepageActivity" >
</activity>
<activity
android:name=".RegisterActivity"
android:label="RegisterActivity" >
</activity>
</application>
</manifest>
------logcat
12-30 13:33:34.341 6574-6574/sergio.applicationone E/﹕ Device driver API match
Device driver API version: 23
User space API version: 23
12-30 13:33:34.341 6574-6574/sergio.applicationone E/﹕ mali: REVISION=Linux-r3p2-01rel3 BUILD_DATE=Fri Mar 21 13:52:50 KST 2014
12-30 13:34:35.676 6574-6804/sergio.applicationone E/Buffer Error﹕ Error converting result java.lang.NullPointerException: lock == null
12-30 13:34:40.731 6574-6804/sergio.applicationone E/JSON Parser﹕ Error parsing data org.json.JSONException: End of input at character 0 of
12-30 13:34:56.866 6574-6574/sergio.applicationone I/Choreographer﹕ Skipped 1267 frames! The application may be doing too much work on its main thread.
12-30 13:35:24.221 6574-6804/sergio.applicationone W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0x41de5c08)
12-30 13:35:24.361 6574-6574/sergio.applicationone I/Choreographer﹕ Skipped 1593 frames! The application may be doing too much work on its main thread.
12-30 13:35:24.451 6574-6804/sergio.applicationone E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: sergio.applicationone, PID: 6574
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException
at sergio.applicationone.RegisterActivity$CreateUser.doInBackground(RegisterActivity.java:118)
at sergio.applicationone.RegisterActivity$CreateUser.doInBackground(RegisterActivity.java:77)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
12-30 13:35:25.971 6574-6574/sergio.applicationone E/WindowManager﹕ android.view.WindowLeaked: Activity sergio.applicationone.RegisterActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{425e22d8 V.E..... R......D 0,0-639,128} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:468)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:289)
at sergio.applicationone.RegisterActivity$CreateUser.onPreExecute(RegisterActivity.java:91)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at sergio.applicationone.RegisterActivity.onClick(RegisterActivity.java:73)
at android.view.View.performClick(View.java:4640)
at android.view.View$PerformClick.run(View.java:19425)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

put all this code outside doinbackground
String username = mUsername.getText().toString();
String email = mUserEmail.getText().toString();
String password = mUserPassword.getText().toString();

How to parse JSON from url with paremeters

This is my AsyncTask:
public class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog = new ProgressDialog(GetData.this);
protected void onPreExecute() {
dialog.setMessage("Searching Database");
dialog.show();
}
protected Boolean doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
// get JSON data from URL
JSONArray json = jParser.getJSONFromUrl(url);
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String Listing_ID = c.getString(lblListing_ID);
String Event_ID = c.getString(lblEvent_ID);
String Venue_ID = c.getString(lblVenue_ID);
String Start_Date = c.getString(lblStart_Date);
String End_Date = c.getString(lblEnd_Date);
String Frequency = c.getString(lblFrequency);
HashMap<String, String> map = new HashMap<String, String>();
// Add child node to HashMap key & value
map.put(lblListing_ID, Listing_ID);
map.put(lblEvent_ID, Event_ID);
map.put(lblVenue_ID, Venue_ID);
map.put(lblStart_Date, Start_Date);
map.put(lblEnd_Date, End_Date);
map.put(lblFrequency, Frequency);
jsonlist.add(map);
}
catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
ListAdapter adapter = new SimpleAdapter(GetData.this, jsonlist,
R.layout.list_item, new String[] { lblListing_ID , lblEvent_ID,
lblVenue_ID, lblStart_Date, lblEnd_Date, lblFrequency }, new int[] {
R.id.Listing_ID, R.id.Event_ID, R.id.Venue_ID,
R.id.Start_Date, R.id.End_Date, R.id.Frequency });
setListAdapter(adapter);
// select single ListView item
lv = getListView();
}
}
And here is my JSONParser class:
public class JSONParser {
static InputStream iStream = null;
static JSONArray jarray = null;
static String json = "";
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Parse String to JSON object
try {
JSONObject object = new JSONObject( builder.toString());
jarray = object.getJSONArray("listings");
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON Object
return jarray;
}
}
When the url is standard like:
http://192.168.1.74/android_connect/get_venues.php
It works fine. However if i add parameters like:
http://192.168.1.74/android_connect/get_venues.php?Venue_Name=Venue Name
It gives the error saying activity has leaked window. Here is the logcat:
23915-23915/com.familiestvw.whatson E/WindowManager﹕ Activity com.familiestvw.whatson.GetData has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42f9a980 V.E..... R......D 0,0-1026,288} that was originally added here
android.view.WindowLeaked: Activity com.familiestvw.whatson.GetData has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42f9a980 V.E..... R......D 0,0-1026,288} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:450)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:258)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:73)
at android.app.Dialog.show(Dialog.java:287)
at com.familiestvw.whatson.GetData$ProgressTask.onPreExecute(GetData.java:84)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at com.familiestvw.whatson.GetData.onCreate(GetData.java:77)
at android.app.Activity.performCreate(Activity.java:5372)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.access$700(ActivityThread.java:159)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
at dalvik.system.NativeStart.main(Native Method)
Any ideas on what the problem is and how to fix it would be greatly appreciated.

Probably the error exists in the AsyncTask, which causes the Activity to shutdown, then when you try to open a dialog, the exception occurs. I suggest that check the earlier log, also try to print what you get from the URL.

Android error converting result java.lang.nullpointerexception

I am trying to create a simple login and registration activity in Android.
I am getting the errors
Error converting result java.lang.nullpointerexception,error parsing
data org.json.JSONException.
Below is my code :
JSONPARSER
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 method
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;
}
}
USERFUNCTIONS:
public class UserFunctions {
private JSONParser jsonParser;
// Testing in localhost using wamp or xampp
// use http://10.0.2.2/ to connect to your localhost ie http://localhost/
private static String loginURL = "http://49.249.85.221/android_api/";
private static String registerURL = "http://49.249.85.221/android_api/";
private static String login_tag = "login";
private static String register_tag = "register";
// constructor
public UserFunctions(){
jsonParser = new JSONParser();
}
/**
* function make Login Request
* #param email
* #param password
* */
public JSONObject loginUser(String email, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
String method=new String();
JSONObject json = jsonParser.makeHttpRequest(loginURL,method, params);
// return json
// Log.e("JSON", json.toString());
return json;
}
/**
* function make Login Request
* #param name
* #param email
* #param password
* */
public JSONObject registerUser(String name, String email, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
String method=new String();
// getting JSON Object
JSONObject json = jsonParser.makeHttpRequest(registerURL,method, params);
// return json
return json;
}
/**
* Function get Login status
* */
public boolean isUserLoggedIn(Context context){
DatabaseHandler db = new DatabaseHandler(context);
int count = db.getRowCount();
if(count > 0){
// user logged in
return true;
}
return false;
}
/**
* Function to logout user
* Reset Database
* */
public boolean logoutUser(Context context){
DatabaseHandler db = new DatabaseHandler(context);
db.resetTables();
return true;
}
}
REGISTERACTIVITY:
public class RegisterActivity extends Activity {
Button btnRegister;
Button btnLinkToLogin;
EditText inputFullName;
EditText inputEmail;
EditText inputPassword;
TextView registerErrorMsg;
// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private class MyAsyncTask extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... params) {
UserFunctions userFunction = new UserFunctions();
if (params.length != 3)
return null;
JSONObject json = userFunction.registerUser(params[0], params[1], params[2]);
return json;
}
protected void onPostExecute(JSONObject json) {
// check for login response
try {
if (json != null && json.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
// user successfully registred
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
UserFunctions userFunction = new UserFunctions();
userFunction.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
// Launch Dashboard Screen
Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Registration Screen
finish();
}else{
// Error in registration
registerErrorMsg.setText("Error occured in registration");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
// Importing all assets like buttons, text fields
inputFullName = (EditText) findViewById(R.id.registerName);
inputEmail = (EditText) findViewById(R.id.registerEmail);
inputPassword = (EditText) findViewById(R.id.registerPassword);
btnRegister = (Button) findViewById(R.id.btnRegister);
btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);
registerErrorMsg = (TextView) findViewById(R.id.register_error);
// Register Button Click event
btnRegister.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String name = inputFullName.getText().toString();
String email = inputEmail.getText().toString();
String password = inputPassword.getText().toString();
new MyAsyncTask().execute(name, email, password);
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.registerUser(name, email, password);
// check for login response
try {
if (json.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
// user successfully registred
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
// Launch Dashboard Screen
Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Registration Screen
finish();
}else{
// Error in registration
registerErrorMsg.setText("Error occured in registration");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
// Link to Login Screen
btnLinkToLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(i);
// Close Registration View
finish();
}
});
}
}
When I ran debugger it pointed to the line if (json.getString(KEY_SUCCESS) != null)
in RegisterActivity. I am clueless as to where I might be wrong. Please guide me on this.
LOGCAT:
10-28 22:40:27.422: D/dalvikvm(373): GC_EXTERNAL_ALLOC freed 78K, 52% free 2599K/5379K, external 897K/1038K, paused 190ms
10-28 22:40:32.000: W/KeyCharacterMap(373): No keyboard for id 0
10-28 22:40:32.000: W/KeyCharacterMap(373): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
10-28 22:40:45.879: E/Buffer Error(373): Error converting result java.lang.NullPointerException
10-28 22:40:45.899: E/Buffer Error(373): Error converting result java.lang.NullPointerException
10-28 22:40:45.983: E/JSON Parser(373): Error parsing data org.json.JSONException: End of input at character 0 of
10-28 22:40:45.989: D/AndroidRuntime(373): Shutting down VM
10-28 22:40:45.989: W/dalvikvm(373): threadid=1: thread exiting with uncaught exception (group=0x40015560)
10-28 22:40:46.049: E/AndroidRuntime(373): FATAL EXCEPTION: main
10-28 22:40:46.049: E/AndroidRuntime(373): java.lang.NullPointerException
10-28 22:40:46.049: E/AndroidRuntime(373): at com.example.androidhive.RegisterActivity$1.onClick (RegisterActivity.java:112)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.view.View.performClick(View.java:2485)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.view.View$PerformClick.run(View.java:9080)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.os.Handler.handleCallback(Handler.java:587)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.os.Handler.dispatchMessage(Handler.java:92)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.os.Looper.loop(Looper.java:123)
10-28 22:40:46.049: E/AndroidRuntime(373): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-28 22:40:46.049: E/AndroidRuntime(373): at java.lang.reflect.Method.invokeNative(Native Method)
10-28 22:40:46.049: E/AndroidRuntime(373): at java.lang.reflect.Method.invoke(Method.java:507)
10-28 22:40:46.049: E/AndroidRuntime(373): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:839)
10-28 22:40:46.049: E/AndroidRuntime(373): at c om.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-28 22:40:46.049: E/AndroidRuntime(373): at dalvik.system.NativeStart.main(Native Method)
10-28 22:40:46.309: E/JSON Parser(373): Error parsing data org.json.JSONException: End of input at character 0 of
10-28 22:40:50.289: I/Process(373): Sending signal. PID: 373 SIG: 9
The main issue is resolved after implementing the solution suggested by Martin.
I am facing some other errors now. LOGCAT is attached below.
10-28 23:17:19.183: D/dalvikvm(449): GC_EXTERNAL_ALLOC freed 78K, 52% free 2599K/5379K, external 897K/1038K, paused 232ms
10-28 23:17:23.259: W/KeyCharacterMap(449): No keyboard for id 0
10-28 23:17:23.269: W/KeyCharacterMap(449): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
10-28 23:17:46.379: E/Buffer Error(449): Error converting result java.lang.NullPointerException
10-28 23:17:46.389: E/Buffer Error(449): Error converting result java.lang.NullPointerException
10-28 23:17:46.389: E/JSON Parser(449): Error parsing data org.json.JSONException: End of input at character 0 of
10-28 23:17:46.409: E/JSON Parser(449): Error parsing data org.json.JSONException: End of input at character 0 of

That might be because the key not even exist, do this before calling json.getString("key"); method:
JSONObject json = yourJSON;
if(json != null && !json.isNull(KEY_SUCCESS)){
//Wahetever you need
String value = json.getString(KEY_SUCCESS);
if(value != null && value.length > 0){
//You will fall here only if there's a value...
}
}
Notice that you first need to make sure that the key actually exist, otherway it could throw a JSONException...
Hope this helps...
Regards!