qqq

package com.baway.test;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.GridView;
import android.widget.Toast;

import com.baway.adapter.MyAdapter;
import com.baway.vo.Data;
import com.baway.vo.Result;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

public class MainActivity extends Activity {
    private PullToRefreshGridView mPullRefreshListView;
    // 网址
    private String URL = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=";
    List<Data> list = new ArrayList<Data>();
    private MyAdapter adapter;
    int z = 242;
    int p = 243;
    private long firstTime = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          // 找控件
        mPullRefreshListView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_grid);
        // 刚进入初次加载
        new GetDataTask().execute(URL + z);
        // 监听
        mPullRefreshListView
                .setOnRefreshListener(new OnRefreshListener2<GridView>() {
                    // 下拉刷新加载
                    @Override
                    public void onPullDownToRefresh(
                            PullToRefreshBase<GridView> refreshView) {
                        Log.e("TAG", "onPullDownToRefresh"); // Do work to
                        // 刷新时间
                        String label = DateUtils.formatDateTime(
                                getApplicationContext(),
                                System.currentTimeMillis(),
                                DateUtils.FORMAT_SHOW_TIME
                                        | DateUtils.FORMAT_SHOW_DATE
                                        | DateUtils.FORMAT_ABBREV_ALL);

                        // Update the LastUpdatedLabel
                        refreshView.getLoadingLayoutProxy()
                                .setLastUpdatedLabel(label);
                        // 页数
                        z = z + 1;
                        // AsyncTask异步交互加载数据
                        new GetDataTask().execute(URL + z);
                    }

                    // 上拉加载跟多
                    @Override
                    public void onPullUpToRefresh(
                            PullToRefreshBase<GridView> refreshView) {
                        Log.e("TAG", "onPullUpToRefresh"); // Do work to refresh

                        // 页数
                        p = p + 1;
                        // AsyncTask异步交互加载数据
                        new GetDataTask2().execute(URL + p);
                    }
                });
    }
    //监听back按键,实现连续按两次退出功能
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
          switch(keyCode)  
           {  
           case KeyEvent.KEYCODE_BACK:  
                long secondTime = System.currentTimeMillis();   
                 if (secondTime - firstTime > 2000) {                                         //如果两次按键时间间隔大于2秒，则不退出  
                     Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();   
                     firstTime = secondTime;//更新firstTime  
                     return true;   
                 } else {                                                    //两次按键小于2秒时，退出应用  
                System.exit(0);  
                 }   
               break;  
           }  
         return super.onKeyUp(keyCode, event);  
    }
     // 下拉刷新加载数据
    private class GetDataTask extends AsyncTask<String, Integer, String> {

        private String s;

        @Override
        protected String doInBackground(String... params) {

            String url = params[0];
            // 请求数据
            s = NetWorkUtil.loginCheck_Get_HttpClient(url);

            return s;
        }

        @Override
        protected void onPostExecute(String result) {
            // 解析
            Gson gson = new Gson();

            Result good = gson.fromJson(result, Result.class);
            List<Data> data = good.getResult().getData();

            list = data;
            // 适配
            adapter = new MyAdapter(MainActivity.this, list);
            mPullRefreshListView.setAdapter(adapter);
            // 刷新适配器
            adapter.notifyDataSetChanged();
            // 关闭刷新下拉
            mPullRefreshListView.onRefreshComplete();

        }
    }

    // 上拉加载更多
    private class GetDataTask2 extends AsyncTask<String, Integer, String> {

        private String s;

        @Override
        protected String doInBackground(String... params) {

            String url = params[0];
            // 请求数据
            s = NetWorkUtil.loginCheck_Get_HttpClient(url);

            return s;
        }

        @Override
        protected void onPostExecute(String result) {
            // 解析
            Gson gson = new Gson();
            Result good = gson.fromJson(result, Result.class);
            List<Data> data = good.getResult().getData();
            list.addAll(data);
            // 刷新适配器
            adapter.notifyDataSetChanged();
            // Call onRefreshComplete when the list has been refreshed.
            // 关闭上拉加载
            mPullRefreshListView.onRefreshComplete();
        }
    }
}