title: Error parsing data org.json.JSONException: End of input at character 0 of - Android
body: <p>I'm developing a test Android application that must display some data from a mysql db.
  Here my logs:</p>
  
  <pre><code>05-22 17:10:56.865: E/JSON Parser(31648): Error parsing data org.json.JSONException: End of input at character 0 of 
  05-22 17:10:56.865: W/dalvikvm(31648): threadid=11: thread exiting with uncaught exception (group=0x418e3da0)
  05-22 17:10:56.875: E/AndroidRuntime(31648): FATAL EXCEPTION: AsyncTask #1
  05-22 17:10:56.875: E/AndroidRuntime(31648): Process: com.example.androidhive, PID: 31648
  05-22 17:10:56.875: E/AndroidRuntime(31648): java.lang.RuntimeException: An error occured while executing doInBackground()
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at android.os.AsyncTask$3.done(AsyncTask.java:300)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.lang.Thread.run(Thread.java:841)
  05-22 17:10:56.875: E/AndroidRuntime(31648): Caused by: java.lang.NullPointerException
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:130)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  05-22 17:10:56.875: E/AndroidRuntime(31648):    ... 3 more
  05-22 17:10:57.436: D/AbsListView(31648): onDetachedFromWindow
  05-22 17:10:57.436: D/AbsListView(31648): unregisterIRListener() is called 
  05-22 17:10:57.446: E/WindowManager(31648): android.view.WindowLeaked: Activity com.example.androidhive.AllProductsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42c02238 V.E..... R.....ID 0,0-914,346} that was originally added here
  05-22 17:10:57.446: E/WindowManager(31648):     at android.view.ViewRootImpl.&lt;init&gt;(ViewRootImpl.java:456)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.Dialog.show(Dialog.java:288)
  05-22 17:10:57.446: E/WindowManager(31648):     at com.example.androidhive.AllProductsActivity$LoadAllProducts.onPreExecute(AllProductsActivity.java:117)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.os.AsyncTask.execute(AsyncTask.java:535)
  05-22 17:10:57.446: E/WindowManager(31648):     at com.example.androidhive.AllProductsActivity.onCreate(AllProductsActivity.java:57)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.Activity.performCreate(Activity.java:5426)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.ActivityThread.access$900(ActivityThread.java:161)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.os.Handler.dispatchMessage(Handler.java:102)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.os.Looper.loop(Looper.java:157)
  05-22 17:10:57.446: E/WindowManager(31648):     at android.app.ActivityThread.main(ActivityThread.java:5356)
  05-22 17:10:57.446: E/WindowManager(31648):     at java.lang.reflect.Method.invokeNative(Native Method)
  05-22 17:10:57.446: E/WindowManager(31648):     at java.lang.reflect.Method.invoke(Method.java:515)
  05-22 17:10:57.446: E/WindowManager(31648):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
  05-22 17:10:57.446: E/WindowManager(31648):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
  05-22 17:10:57.446: E/WindowManager(31648):     at dalvik.system.NativeStart.main(Native Method)
  05-22 17:11:01.279: I/Process(31648): Sending signal. PID: 31648 SIG: 9
  </code></pre>
  
  <p>Here the class JSONParser.java</p>
  
  <pre><code>package com.example.androidhive;
  
  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&lt;NameValuePair&gt; 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();
              }
  </code></pre>
  
  <p>Here the class I use to display the selected data:</p>
  
  <pre><code>package com.example.androidhive;
  
  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;
  
  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 AllProductsActivity extends ListActivity {
  
      // Progress Dialog
      private ProgressDialog pDialog;
  
      // Creating JSON Parser object
      JSONParser jParser = new JSONParser();
  
      ArrayList&lt;HashMap&lt;String, String&gt;&gt; productsList;
  
      // url to get all products list
      private static String url_all_products = "http://10.1.20.10/android/get_all_products.php";
  
      // JSON Node names
      private static final String TAG_SUCCESS = "success";
      private static final String TAG_PRODUCTS = "products";
      private static final String TAG_PID = "pid";
      private static final String TAG_NAME = "name";
  
      // products JSONArray
      JSONArray products = null;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.all_products);
  
          // Hashmap for ListView
          productsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;();
  
          // Loading products in Background Thread
          new LoadAllProducts().execute();
  
          // Get listview
          ListView lv = getListView();
  
          // on seleting single product
          // launching Edit Product Screen
          lv.setOnItemClickListener(new OnItemClickListener() {
  
              @Override
              public void onItemClick(AdapterView&lt;?&gt; parent, View view,
                      int position, long id) {
                  // getting values from selected ListItem
                  String pid = ((TextView) view.findViewById(R.id.pid)).getText()
                          .toString();
  
                  // Starting new intent
                  Intent in = new Intent(getApplicationContext(),
                          EditProductActivity.class);
                  // sending pid to next activity
                  in.putExtra(TAG_PID, pid);
  
                  // starting new activity and expecting some response back
                  startActivityForResult(in, 100);
              }
          });
  
      }
  
      // Response from Edit Product Activity
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          // if result code 100
          if (resultCode == 100) {
              // if result code 100 is received
              // means user edited/deleted product
              // reload this screen again
              Intent intent = getIntent();
              finish();
              startActivity(intent);
          }
  
      }
  
      /**
       * Background Async Task to Load all product by making HTTP Request
       * */
      class LoadAllProducts extends AsyncTask&lt;String, String, String&gt; {
  
          /**
           * Before starting background thread Show Progress Dialog
           * */
          @Override
          protected void onPreExecute() {
              super.onPreExecute();
              pDialog = new ProgressDialog(AllProductsActivity.this);
              pDialog.setMessage("Loading products. Please wait...");
              pDialog.setIndeterminate(false);
              pDialog.setCancelable(false);
              pDialog.show();
          }
  
          /**
           * getting All products from url
           * */
          protected String doInBackground(String... args) {
              // Building Parameters
              List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;();
              // getting JSON string from URL
              JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
  
              // Check your log cat for JSON reponse
              Log.d("All Products: ", json.toString());
  
              try {
                  // Checking for SUCCESS TAG
                  int success = json.getInt(TAG_SUCCESS);
  
                  if (success == 1) {
                      // products found
                      // Getting Array of Products
                      products = json.getJSONArray(TAG_PRODUCTS);
  
                      // looping through All Products
                      for (int i = 0; i &lt; products.length(); i++) {
                          JSONObject c = products.getJSONObject(i);
  
                          // Storing each json item in variable
                          String id = c.getString(TAG_PID);
                          String name = c.getString(TAG_NAME);
  
                          // creating new HashMap
                          HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;();
  
                          // adding each child node to HashMap key =&gt; value
                          map.put(TAG_PID, id);
                          map.put(TAG_NAME, name);
  
                          // adding HashList to ArrayList
                          productsList.add(map);
                      }
                  } else {
                      // no products found
                      // Launch Add New product Activity
                      Intent i = new Intent(getApplicationContext(),
                              NewProductActivity.class);
                      // Closing all previous activities
                      i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                      startActivity(i);
                  }
              } catch (JSONException e) {
                  e.printStackTrace();
              }
  
              return null;
          }
  
          /**
           * After completing background task Dismiss the progress dialog
           * **/
          protected void onPostExecute(String file_url) {
              // dismiss the dialog after getting all products
              pDialog.dismiss();
              // updating UI from Background Thread
              runOnUiThread(new Runnable() {
                  public void run() {
                      /**
                       * Updating parsed JSON data into ListView
                       * */
                      ListAdapter adapter = new SimpleAdapter(
                              AllProductsActivity.this, productsList,
                              R.layout.list_item, new String[] { TAG_PID,
                                      TAG_NAME},
                              new int[] { R.id.pid, R.id.name });
                      // updating listview
                      setListAdapter(adapter);
                  }
              });
  
          }
  
      }
  }
  </code></pre>
  
  <p>Here the php file:</p>
  
  <pre><code>get_all_products.php
  &lt;?php
  
  /*
   * Following code will list all the products
   */
  
  // array for JSON response
  $response = array();
  
  // include db connect class
  require_once __DIR__ . '/db_connect.php';
  
  // connecting to db
  $db = new DB_CONNECT();
  
  // get all products from products table
  $result = mysql_query("SELECT *FROM products") or die(mysql_error());
  
  // check for empty result
  if (mysql_num_rows($result) &gt; 0) {
      // looping through all results
      // products node
      $response["products"] = array();
  
      while ($row = mysql_fetch_array($result)) {
          // temp user array
          $product = array();
          $product["pid"] = $row["pid"];
          $product["name"] = $row["name"];
          $product["price"] = $row["price"];
          $product["created_at"] = $row["created_at"];
          $product["updated_at"] = $row["updated_at"];
  
          // push single product into final response array
          array_push($response["products"], $product);
      }
      // success
      $response["success"] = 1;
  
      // echoing JSON response
      echo json_encode($response);
  } else {
      // no products found
      $response["success"] = 0;
      $response["message"] = "No products found";
  
      // echo no users JSON
      echo json_encode($response);
  }
  ?&gt;
  </code></pre>
  
  <p>In addition, here the main Activity:</p>
  
  <pre><code>package com.example.androidhive;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.Button;
  
  public class MainScreenActivity extends Activity{
  
      Button btnViewProducts;
      Button btnNewProduct;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main_screen);
  
          // Buttons
          btnViewProducts = (Button) findViewById(R.id.btnViewProducts);
          btnNewProduct = (Button) findViewById(R.id.btnCreateProduct);
  
          // view products click event
          btnViewProducts.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View view) {
                  // Launching All products Activity
                  Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
                  startActivity(i);
  
              }
          });
  
          // view products click event
          btnNewProduct.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View view) {
                  // Launching create new product activity
                  Intent i = new Intent(getApplicationContext(), NewProductActivity.class);
                  startActivity(i);
  
              }
          });
      }
  
  }
  </code></pre>
  
  <p>I read various thread around the internet about this error, but it is even caused by differents problems, and I did not found a case similar to mine or a solution that solved my problem.</p>