Android uses ListView to implement pull-down refresh and pull-up display methods

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/**
  * @author Stay
  * Dynamically load listview data, pull up, refresh, pull down More
  */
public class ListViewActivity extends Activity implements OnScrollListener {
  private static final int LOAD = 0;
  private static final int ERROR = 0;
  private static final int MEMBER = 1;
  private static final int LOADED = 2;
  private static final int DIALOG = 3;
  private static final int FULL = 4;
  private NearbyAdapter adapter;
  private ListView nearby_lv;
  private RelativeLayout nearby_lv_header;
  private Button list_bottom_btn;
  private LinearLayout list_bottom_linear;
  private TextView bottom_progress_text;
  private RelativeLayout nearby_lv_footer;
  private Button list_header_btn;
  private LinearLayout list_header_linear;
  private TextView heard_progress_text;
  private ArrayList<JSONObject> nearby_data = new ArrayList<JSONObject>();
  private int lastItem;
  private HashMap<String, Drawable> imageCache;
  private  myHandler;
  private ProgressDialog dialog;
  private int curPage = 1;
  private boolean isMember = false;
  private int firstItem;
  public int count;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView();
    initView();
    (LOAD);
  }
  @Override
  public void onScrollStateChanged(AbsListView view, int scrollState) {
    ("onScrollStateChanged");
    // When the scrolling stops and the total number of scrolling is equal to the total number of data, go load    if (lastItem == count && scrollState == SCROLL_STATE_IDLE) {
      ("onScrollStateChanged--------next");
      if (curPage == 4 && !isMember) {
        (this, "You are not a formal member, please apply for a formal member.");
        list_bottom_linear.setVisibility();
      } else {
        //Load data        (LOAD);
      }
      return;
    }
    //Update the data when pulling up, clear the data and then reload it    if (firstItem == 0 && scrollState == SCROLL_STATE_IDLE) {
      ("onScrollStateChanged--------refresh");
      curPage = 0;
      (LOAD);
    }
  }
  @Override
  public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    ("firstVisibleItem=" + firstVisibleItem);
    ("visibleItemCount=" + visibleItemCount);
    ("totalItemCount=" + totalItemCount);
    //We need to subtract two here, because I added the header footer    lastItem = firstVisibleItem + visibleItemCount - 2;
    firstItem = firstVisibleItem;
  }
  public int getData() {
    try {
      HttpURLConnection conn = (url//Written by yourself);      ArrayList<JSONObject> temp = (());
      if (curPage == 0 && nearby_data.size() > 0) {
        nearby_data.clear();
        count = 0;
      }
      if (temp != null && () > 0) {
        count += ();
        nearby_data.addAll(temp);
        ("nearby_data.size()="+nearby_data.size());
      } else {
        return FULL;
      }
      return LOADED;
    } catch (Exception e) {
      return ERROR;
    }
  }
  private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      (msg);
      switch () {
      case DIALOG:
        list_bottom_linear.setVisibility();
        list_header_linear.setVisibility();
        break;
      case LOADED:
        list_bottom_linear.setVisibility();
        list_header_linear.setVisibility();
        curPage++;
        ();
        break;
      case ERROR:
        ("error,missing data");
        break;
      case MEMBER:
        ("you must regist formal member");
        break;
      default:
        break;
      }
    }
  };
//Create child thread to load data and then update  private class MyHandler extends Handler {
    private int status;
    public MyHandler(Looper looper) {
      super(looper);
    }
    @Override
    public void handleMessage(Message msg) {
      synchronized (this) {
        switch () {
        case LOAD:// get data from server
          (DIALOG);//Show the waiting box          status = getData();
          (status, 1000);
          break;
        default:
          break;
        }
      }
    }
  }
  public void initView() {
    imageCache = new HashMap<String, Drawable>();
    HandlerThread handlerThread = new HandlerThread("nearby");
    // Before using the getLooper() method of HandlerThread, the start() of the class must be called;    ();
    myHandler = new MyHandler(());
    nearby_lv = (ListView) findViewById(.nearby_lv);
    nearby_lv_footer = (RelativeLayout) ().inflate(.nearby_lv_header, null);
    list_bottom_btn = (Button) nearby_lv_footer.findViewById(.list_bottom_btn);
    list_bottom_linear = (LinearLayout) nearby_lv_footer.findViewById(.list_bottom_linear);
    bottom_progress_text = (TextView) nearby_lv_footer.findViewById(.progress_text);
    nearby_lv_header = (RelativeLayout) ().inflate(.nearby_lv_header, null);
    list_header_btn = (Button) nearby_lv_header.findViewById(.list_bottom_btn);
    list_header_linear = (LinearLayout) nearby_lv_header.findViewById(.list_bottom_linear);
    heard_progress_text = (TextView) nearby_lv_header.findViewById(.progress_text);
    list_header_btn.setText("refresh");
    list_bottom_btn.setText("More");
    list_header_linear.setVisibility();
    nearby_lv.addHeaderView(nearby_lv_header);
    nearby_lv.addFooterView(nearby_lv_footer);
    // list_header_btn.setOnClickListener(header_click);
    adapter = new NearbyAdapter(, nearby_data);
    nearby_lv.setAdapter(adapter);
    nearby_lv.setOnScrollListener();
  }
}