title: ArrayAdapter causing crash
body: <p>I am trying to implement an array adapter and I am getting an error everytime the activity starts. </p>
  
  <p>here is my class and I have noted the line which causes the crash. </p>
  
  <pre><code>public class Attend extends Activity{
  
  ListView amattendees;
  ListView pmattendees;
  String attendingAm[];
  String attendingPm[];
  JSONParser jParser = new JSONParser();
   JSONObject json_event;
   String json_name = null;
   String json_badge_id = null;
   String json_venue_id = null;
   String json_event_id = null;
   String json_id = null;
   String json_date = null;
   String json_amLesson = null;
   String json_pmLesson = null;
   String json_youtubeid = null;
   String json_lessonHTML = null;
   String json_active = null;
   String json_created = null;
   String json_attending = null;
   String json_status = null;
   String fragmented = null;
   String json_title = null;
   String json_event_description = null;
  
   String[] participants = null;
   String setAttending_response = "Attend";
   String scannedBar = "default";
   SharedPreferences settings;
   String json_videopath;
   String str_accesstoken;
   Context context;
   VideoView youtubeVideo;
   String sAttending = "false";
   String home_venue_long = null;
   String home_venue_lat = null;
   private static final int REQUEST_BARCODE = 0;
   double my_longitude;
   double my_latitude;
   String json_venue_distance;
   String json_nearest_venue;
   String json_nearest_venue_logo;
   String json_nearest_venue_long;
   String json_nearest_venue_lat;
   String  json_participants_arr[];
  
  
   public String[] createArrayFromJSON(JSONArray json_array_participants){
        String json_participants[] = new String[json_array_participants.length()];
        json_participants_arr = new String[json_array_participants.length()];
   for(int i = 0; i &lt; json_participants.length; i++){
       try{
           json_participants[i] = json_array_participants.getString(i);   
           json_participants_arr[i] = json_array_participants.getString(i);  
          }
          catch(JSONException e){
           e.getStackTrace();
          }
    }
   return json_participants;
   }
  
  
  
   public void onCreate(Bundle savedInstanceState){
          super.onCreate(savedInstanceState);
          setContentView(R.layout.attend);            
  
          amattendees = (ListView)findViewById(R.id.amattendees);
          pmattendees = (ListView)findViewById(R.id.pmattendees);
  
  
  
           try{
                  //get the JSON values from the URL.
                  JSONObject json = jParser.getJSONFromUrl("http://ajsonfeed.com?hi=23849348934");
  
  
                 json_event = json.getJSONObject("event");
                 json_name = json_event.getString("name");
                 json_status = json.getString("status");
                 json_badge_id =  json_event.getString("badge_id");
                 json_venue_id = json_event.getString("venue_id");
                 json_event_id = json_event.getString("event_id");
                 json_id = json_event.getString("id");
                 json_date = json_event.getString("date");
                 json_amLesson = json_event.getString("amLesson");
                 json_pmLesson = json_event.getString("pmLesson");
                 json_youtubeid= json_event.getString("youtubeId");
                 json_lessonHTML = json_event.getString("lessonHTML");
                 json_active = json_event.getString("active");
                 json_created = json_event.getString("created");
                 json_attending = json_event.getString("attending");
                 fragmented = json_event.getString("fragmented");
                 JSONArray json_array_participants = json_event.getJSONArray("participants");   
  
                 createArrayFromJSON(json_array_participants);
  
  
                  }
                  catch(JSONException e){
                      e.getStackTrace();
                  }
  </code></pre>
  
  <p>this line crashes it.</p>
  
  <pre><code>ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1,android.R.id.text1, json_participants_arr);
  </code></pre>
  
  <p>.           </p>
  
  <pre><code> }
  
  
  
  
  
  
  }
  </code></pre>
  
  <p>Error log from logcat:</p>
  
  <pre><code>04-12 16:58:32.683: E/AndroidRuntime(7920): FATAL EXCEPTION: main
  04-12 16:58:32.683: E/AndroidRuntime(7920): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.jujitsu.app.com/org.jujitsu.app.com.Attend}: java.lang.NullPointerException
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1816)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread.access$1500(ActivityThread.java:132)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.os.Handler.dispatchMessage(Handler.java:99)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.os.Looper.loop(Looper.java:143)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread.main(ActivityThread.java:4196)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at java.lang.reflect.Method.invokeNative(Native Method)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at java.lang.reflect.Method.invoke(Method.java:507)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at dalvik.system.NativeStart.main(Native Method)
  04-12 16:58:32.683: E/AndroidRuntime(7920): Caused by: java.lang.NullPointerException
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at java.util.Arrays$ArrayList.&lt;init&gt;(Arrays.java:47)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at java.util.Arrays.asList(Arrays.java:169)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.widget.ArrayAdapter.&lt;init&gt;(ArrayAdapter.java:138)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at org.jujitsu.app.com.Attend.onCreate(Attend.java:124)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1780)
  04-12 16:58:32.683: E/AndroidRuntime(7920):     ... 11 more
  </code></pre>