Searching for Facebook profiles and displaying them into a ListView Android is temperamental

Searching for Facebook profiles and displaying them into a ListView
Android is temperamental

I am using the Facebook Graph API to request a list of Facebook profiles
and return them in a ListView displaying both names and profile pictures.
I have two EditText fields in my main acitivty to enter both first and
second names. A button starts my ListViewActivity when clicked and the
names are passed. The ListView inflates and the request is sent to
Facebook and each row in the ListView is updated using a custom adapter.
The problem is, I suspect, a memory leak. It is very temperamental as in,
it would work once or twice if I'm lucky and any other attempts to update
the ListView wouldn't work, the activity would remain blank. It doesn't
work for some more common names either.
Below is my ListViewActivity:
public class ListViewActivity extends Activity implements
OnItemClickListener {
public String firstname, secondname;
URL imageURL;
ArrayList<String> names = new ArrayList<String>();
ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>();
public static final String[] descriptions = new String[] {"Description"};
ListView listView;
List<RowItem> rowItems;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
loadData();
rowItems = new ArrayList<RowItem>();
listView = (ListView) findViewById(R.id.listview);
CustomListViewAdapter adapter = new CustomListViewAdapter(this,
R.layout.list_item, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
public void loadData() {
Session session = Session.getActiveSession();
firstname = getIntent().getExtras().getString("firstname");
secondname = getIntent().getExtras().getString("secondname");
if(session==null){
session = Session.openActiveSessionFromCache(this);
} else if (session.isOpened()) {
Bundle params = new Bundle();
params.putString("fields", "name, picture, url, id");
params.putString("limit", "10");
Request request = new Request(session, "search?q="+ firstname + "%20"
+ secondname + "&limit=10&type=user&fields=name,picture", params,
HttpMethod.GET, new Request.Callback() {
@Override
public void onCompleted(Response response) {
// TODO Auto-generated method stub
JSONObject jsonObject = null;
JSONArray jArray = null;
imageURL = null;
try {
jsonObject = new
JSONObject(response.getGraphObject().getInnerJSONObject().toString());
jArray = jsonObject.getJSONArray("data");
for (int i = 0; i < jArray.length(); i++) {
JSONObject element = null;
element = jArray.getJSONObject(i);
imageURL = new URL("http://graph.facebook.com/"+
element.get("id") +"/picture?type=large");
names.add(element.getString("name").toString());
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
bitmaps.add(BitmapFactory.decodeStream(imageURL.openConnection().getInputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
thread.start();
thread.join();
if (bitmaps.size() == jArray.length()) {
for (int j=0; j<jArray.length(); j++) {
RowItem item = new RowItem(bitmaps.get(j),
names.get(j), descriptions[0]);
rowItems.add(item);
}
}
}
} catch (JSONException e) {
System.out.println("JSON EXCEPTION:"+ e);
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
RequestAsyncTask task = new RequestAsyncTask(request);
task.execute();
} else {
Log.d("close", " ");
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1) + ": " + rowItems.get(position),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}