import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.stay.wifi.R;

/**
 * @author Stay 
 * 动态加载listview数据，上拉 刷新，下拉 更多
 */
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 com.stay.main.ListViewActivity.MyHandler 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) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initView();
        myHandler.sendEmptyMessage(LOAD);
    }

@Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        DebugUtil.debug("onScrollStateChanged");
        //当滚动停止且滚动的总数等于数据的总数，去加载
        if (lastItem == count && scrollState == SCROLL_STATE_IDLE) {
            DebugUtil.debug("onScrollStateChanged--------next");
            if (curPage == 4 && !isMember) {
                DebugUtil.show(this, "您不是正式会员，请申请正式会员，");
                list_bottom_linear.setVisibility(View.GONE);
            } else {
                //加载数据
                myHandler.sendEmptyMessage(LOAD);
            }
            return;
        }
        //当往上拉时更新数据，将data清空然后去重新加载
        if (firstItem == 0 && scrollState == SCROLL_STATE_IDLE) {
            DebugUtil.debug("onScrollStateChanged--------refresh");
            curPage = 0;
            myHandler.sendEmptyMessage(LOAD);
        }
    }

@Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        DebugUtil.debug("firstVisibleItem=" + firstVisibleItem);
        DebugUtil.debug("visibleItemCount=" + visibleItemCount);
        DebugUtil.debug("totalItemCount=" + totalItemCount);
        //这里要减二，因为我加了header footer
        lastItem = firstVisibleItem + visibleItemCount - 2;
        firstItem = firstVisibleItem;
    }

public int getData() {
        try {
            HttpURLConnection conn = DownloadUtil.download(url//自己写咯);
            ArrayList<JSONObject> temp = JSONUtil.streamToJsonList(conn.getInputStream());
            if (curPage == 0 && nearby_data.size() > 0) {
                nearby_data.clear();
                count = 0;
            }
            if (temp != null && temp.size() > 0) {
                count += temp.size();
                nearby_data.addAll(temp);
                DebugUtil.debug("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) {
            super.handleMessage(msg);
            switch (msg.what) {
            case DIALOG:
                list_bottom_linear.setVisibility(View.VISIBLE);
                list_header_linear.setVisibility(View.VISIBLE);
                break;
            case LOADED:
                list_bottom_linear.setVisibility(View.GONE);
                list_header_linear.setVisibility(View.GONE);
                curPage++;
                adapter.notifyDataSetChanged();
                break;
            case ERROR:
                DebugUtil.debug("error,missing data");
                break;
            case MEMBER:
                DebugUtil.debug("you must regist formal member");
                break;
            default:
                break;
            }
        }
    };
//创建子线程加载数据，然后更新
    private class MyHandler extends Handler {
        private int status;

public MyHandler(Looper looper) {
            super(looper);
        }

@Override
        public void handleMessage(Message msg) {
            synchronized (this) {
                switch (msg.what) {
                case LOAD:// get data from server
                    handler.sendEmptyMessage(DIALOG);//显示等待框
                    status = getData();
                    handler.sendEmptyMessageDelayed(status, 1000);
                    break;
                default:
                    break;
                }
            }
        }
    }

public void initView() {
        imageCache = new HashMap<String, Drawable>();
        HandlerThread handlerThread = new HandlerThread("nearby");
        // 在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();
        handlerThread.start();
        myHandler = new MyHandler(handlerThread.getLooper());
        nearby_lv = (ListView) findViewById(R.id.nearby_lv);
        nearby_lv_footer = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header, null);
        list_bottom_btn = (Button) nearby_lv_footer.findViewById(R.id.list_bottom_btn);
        list_bottom_linear = (LinearLayout) nearby_lv_footer.findViewById(R.id.list_bottom_linear);
        bottom_progress_text = (TextView) nearby_lv_footer.findViewById(R.id.progress_text);
        nearby_lv_header = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header, null);
        list_header_btn = (Button) nearby_lv_header.findViewById(R.id.list_bottom_btn);
        list_header_linear = (LinearLayout) nearby_lv_header.findViewById(R.id.list_bottom_linear);
        heard_progress_text = (TextView) nearby_lv_header.findViewById(R.id.progress_text);
        list_header_btn.setText("刷新");
        list_bottom_btn.setText("更多");
        list_header_linear.setVisibility(View.GONE);
        nearby_lv.addHeaderView(nearby_lv_header);
        nearby_lv.addFooterView(nearby_lv_footer);
        // list_header_btn.setOnClickListener(header_click);
        adapter = new NearbyAdapter(ListViewActivity.this, nearby_data);
        nearby_lv.setAdapter(adapter);
        nearby_lv.setOnScrollListener(ListViewActivity.this);
    }
}