title: Passing parameters from Activity to doInBackground method, Async Task
body: <p>I'm trying to pass a variable "chartUrl" from JsonActivity to the doInBackground method as shown below. I've tried to change the arguments but that did not work. Does anyone know how to do this?</p>
  
  <p>Thanks in advance</p>
  
  <p>Code :</p>
  
  <p>public class JsonActivity extends ListActivity{</p>
  
  <pre><code> private ProgressDialog progressDialog;
  
      // JSON Node names
  
      private static final String TAG_RANK = "rank";
      private static final String TAG_NAME = "name";
     String chartUrl;
  
      String[] urlNames = new String[] { 
              "myurls"
  
              };
  
   // chartItemList holds the chart items 
      ArrayList&lt;HashMap&lt;String, String&gt;&gt; chartItemList = new ArrayList&lt;HashMap&lt;String, 
          String&gt;&gt;();
      JsonParser Parser = new JsonParser();
  
      JSONArray chartItems = null;
  
      /** Called when the activity is first created. */    
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          //setContentView(R.layout.listlayout);
  
        //Get the bundle from other activity
          Bundle bundle = getIntent().getExtras();
  
          //Extract chart index from the bundle
          int chartIndex = bundle.getInt("chartIndex");
          String chartUrl = urlNames[chartIndex]; 
  
  
          //Check if the user has a connection
  
          ConnectivityManager cm = (ConnectivityManager) 
              getSystemService(Context.CONNECTIVITY_SERVICE);
          NetworkInfo info = cm.getActiveNetworkInfo();
          if (info != null) {
              if (!info.isConnected()) {
                  Toast.makeText(this, "Please check your connection and try again.", 
               Toast.LENGTH_SHORT).show();
              }
  
              //if positive, fetch the articles in background
              else new getChartItems().execute(chartUrl);
          }
  
          //else show toast
          else {
              Toast.makeText(this, "Please check your connection and try again.", 
              Toast.LENGTH_SHORT).show();
          }
  
      }
  
  
      class getChartItems extends AsyncTask&lt;String, String, String&gt; {
  
          // Shows a progress dialog while setting up the background task
          @Override
          protected void onPreExecute() {
              super.onPreExecute();
              progressDialog = new ProgressDialog(JsonActivity.this);
              progressDialog.setMessage("Loading chart...");
              progressDialog.setIndeterminate(false);
              progressDialog.setCancelable(false);
              progressDialog.show();
          }
  
          //Gets the json data for chart items data and presents it in a list view
          @Override
          protected String doInBackground(String... args) {
  
  
              String json = Parser.getJSONFromUrl(chartUrl);
  
              String rank;
  
              String name;
  
              try{
  
              chartItems = new JSONArray(json);
  
              JSONObject json_data=null;
  
               for(int i=0;i&lt;chartItems.length();i++){
  
                  json_data = chartItems.getJSONObject(i);
                  rank=json_data.getString("rank");
                  name=json_data.getString("name");
  
  
                   HashMap&lt;String, String&gt; hashMap = new HashMap&lt;String, String&gt;();
                   // adding each child node to HashMap key =&gt; value
                   hashMap.put(TAG_RANK, rank);
                   hashMap.put(TAG_NAME, name);
  
                   // adding HashMap to ArrayList
                      chartItemList.add(hashMap);
  
               }
  
  
                ;
              }
  
              catch (JSONException e) {
                  e.printStackTrace();
              }
  
              runOnUiThread(new Runnable() {
                  public void run() {
                       System.out.println(chartItemList);
  
                    //updates the list view with the parsed items
                      ListAdapter adapter = new SimpleAdapter(JsonActivity.this, chartItemList,
                              R.layout.list_item,
                              new String[] {TAG_RANK,TAG_NAME, }, new int[] 
  
                           {R.id.rank ,R.id.name});
                      setListAdapter(adapter);
                  }
              });
              return null;
          }
  
          //Removes the progress dialog when the data has been fetched
          protected void onPostExecute(String args) {
              progressDialog.dismiss();
          }
      }
  
  
    }
  </code></pre>