@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listview);
    cityListView = (ListView) findViewById(R.id.city_list);

    setTitle("选择城市");

    String webSite = "https://api.douban.com/v2/loc/list";

    if (progressDialog == null) {

      progressDialog = new ProgressDialog(this);
      progressDialog.setMessage("加载中");
      progressDialog.setCanceledOnTouchOutside(false);
      progressDialog.show();
    }

    HttpUtil.sendHttpRequest(
        webSite,
        new HttpCallbackListener() {
          @Override
          public void onFinish(String response) {
            progressDialog.dismiss();
            parseJSONWithJSONObjects(response);
          }

          @Override
          public void onError(Exception e) {}
        });
  }
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imageView = (ImageView) findViewById(R.id.image);
    title = (TextView) findViewById(R.id.title);
    participant = (TextView) findViewById(R.id.participant);
    wish = (TextView) findViewById(R.id.wish);
    content = (TextView) findViewById(R.id.content);
    map = (Button) findViewById(R.id.map);
    look = (Button) findViewById(R.id.look);
    if (progressDialog == null) {

      progressDialog = new ProgressDialog(this);
      progressDialog.setMessage("加载中");
      progressDialog.setCanceledOnTouchOutside(false);
      progressDialog.show();
    }

    Intent intent = getIntent();
    String eventId = intent.getStringExtra("eventId");
    String website = "https://api.douban.com/v2/event/" + eventId;

    HttpUtil.sendHttpRequest(
        website,
        new HttpCallbackListener() {
          @Override
          public void onFinish(String response) {
            Utility.handleEvent(MainActivity.this, response);
            runOnUiThread(
                new Runnable() {
                  @Override
                  public void run() {
                    showInfo();
                    progressDialog.dismiss();
                  }
                });
          }

          @Override
          public void onError(Exception e) {}
        });

    setTitle("活动详情");
  }