XListView刷新、加载

package com.bawei.test313.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import com.bawei.test313.R;import com.bawei.test313.adapter.MyAdapter;import com.bawei.test313.bean.Info;import com.google.gson.Gson;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.TextHttpResponseHandler;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.ArrayList;import cz.msebera.android.httpclient.Header;import xlistview.example.administrator.myxlistviewlibrary.XListView;/** * Created by Administrator on 2017/3/13. */public class TestBActivity extends Activity {    private XListView listViewB;    private ArrayList<Info.Result> parent_list;    private ArrayList<Info.Result> result;    private int index=1;    private ArrayList<Info.Result> list_now;    private MyAdapterB myAdapterB;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.second_main);        listViewB = (XListView) findViewById(R.id.listviewB);        getNetData();        listViewB.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                Intent intent=new Intent(TestBActivity.this,DetailActivity.class);                intent.putExtra("city",result.get(position).city);                startActivity(intent);            }        });        listViewB.setPullRefreshEnable(true);        listViewB.setPullLoadEnable(true);        listViewB.setXListViewListener(new XListView.IXListViewListener() {            @Override            public void onRefresh() {                //刷新                listViewB.postDelayed(new Runnable() {                    @Override                    public void run() {                        Log.i("---",index+"");                        list_now.clear();                        index=0;                        int j=index+20;                        for (int i=index;i<j;i++){                            index++;                            Log.i("now---",index+"---");                            list_now.add(result.get(i));                        }                        myAdapterB.notifyDataSetChanged();//刷新适配器                        listViewB.stopRefresh();                    }                },2000);            }            @Override            public void onLoadMore() {                listViewB.postDelayed(new Runnable() {                    @Override                    public void run() {                        Log.i("---",index+"");                        int j=index+20;                        for (int i=index;i<j;i++){                            index++;                            Log.i("now---",index+"---");                            list_now.add(result.get(i));                        }                        myAdapterB.notifyDataSetChanged();//刷新适配器                        listViewB.stopLoadMore();                    }                },2000);            }        });    }    //网络请求数据    void getNetData() {        String url = "http://api.jisuapi.com/weather/city?appkey=b4d06fdd59ed379f";        AsyncHttpClient client = new AsyncHttpClient();        client.get(TestBActivity.this, url, new TextHttpResponseHandler() {            @Override            public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {                //失败                Log.i("测试", "失败");            }            @Override            public void onSuccess(int statusCode, Header[] headers, String responseString) {                //成功                // Log.i("测试","成功"+responseString);                String path = Environment.getExternalStorageDirectory()                        .getPath() + "/json.txt";                File file = new File(path);                try {                    file.createNewFile();//创建文件                    FileWriter fileWriter = new FileWriter(file);                    fileWriter.write(responseString);                    fileWriter.flush();//刷新                    fileWriter.close();                } catch (IOException e) {                    e.printStackTrace();                }                getData(responseString);            }        });    }    //解析数据  且分类    void getData(String responseString) {        Gson gson = new Gson();        Info info = gson.fromJson(responseString, Info.class);        result = info.result;        list_now = new ArrayList<Info.Result>();        for (int i=0;i<31;i++){            index++;            list_now.add(result.get(i));//得到30条数据        }        myAdapterB = new MyAdapterB();        listViewB.setAdapter(myAdapterB);    }    class MyAdapterB extends BaseAdapter {        @Override        public int getCount() {            return list_now.size();        }        @Override        public Object getItem(int position) {            return list_now.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder;            if (convertView == null) {                convertView = convertView.inflate(TestBActivity.this, R.layout.itemb, null);                holder = new ViewHolder();                holder.itemtext = (TextView) convertView.findViewById(R.id.itemtext);                holder.item_null = (TextView) convertView.findViewById(R.id.text_null);                convertView.setTag(holder);            } else {                holder = (ViewHolder) convertView.getTag();            }            holder.itemtext.setText(list_now.get(position).city);            if (list_now.get(position).parentid.equals("0")){          //    动态设置权重，宽，高；参数： 宽 高  权重                holder.itemtext.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f));                holder.item_null.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f));            }else{                holder.itemtext.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 2.0f));                holder.item_null.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f));            }            return convertView;        }    }    class ViewHolder {        TextView itemtext;        TextView item_null;    }}