Android ListView显示访问WebServices返回的JSON结果

1、WebServices的返回结果

2、ListView内容布局代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorWhite"
    >

    <ImageView
        android:id="@+id/app_icon"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_centerVertical="true"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="5dp"

        android:src="@mipmap/ic_launcher_round1" />

    <TextView
        android:id="@+id/customitem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/app_icon"
        android:gravity="center"
        android:paddingLeft="20dp"
        android:text="app name"
        android:textSize="20sp"
        android:textColor="@color/colorPrimaryDark"
        android:layout_marginTop="5dp"/>

    <TextView
        android:id="@+id/customdesc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/customitem"
        android:layout_toRightOf="@id/app_icon"
        android:gravity="center"
        android:paddingLeft="20dp"
        android:singleLine="true"
        android:text="app describe"
        android:textSize="14sp"
        android:textColor="@color/colorPrimaryDark"
        android:layout_marginBottom="5dp"/>

</RelativeLayout>

3、Adapter的代码

 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;

 import java.util.List;
 import java.util.Map;

 public class MyCustomAdapter extends BaseAdapter {
     private Context context;
     private List<Map<String,Object>> list;
     private LayoutInflater inflater;
     public MyCustomAdapter(List<Map<String,Object>> list, Context context)
     {
         this.context=context;
         this.list=list;
         inflater=LayoutInflater.from(context);
     }
     @Override
     public int getCount() {
         return list==null?:list.size();
     }

     @Override
     public Object getItem(int position) {
         return   position;
     }

     @Override
     public long getItemId(int position) {
         return position;
     }
     class ViewHolder{
         public ImageView imageView;
         public TextView appText;
         public TextView descText;
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         ViewHolder holder =null;
         if (holder == null){
             holder=new ViewHolder();
             if(convertView ==null){
                 convertView=inflater.inflate(R.layout.drawelist,null);
                 holder.imageView = (ImageView) convertView.findViewById(R.id.app_icon);
                 holder.appText = (TextView) convertView.findViewById(R.id.customitem);
                 holder.descText = (TextView) convertView.findViewById(R.id.customdesc);
                 convertView.setTag(holder);
             }else {
                 //根据Tag获取已经存在的ViewHolder
                 holder = (ViewHolder) convertView.getTag();
             }
             //设置显示内容
             holder.appText.setText(list.get(position).get("name").toString());
             holder.descText.setText(list.get(position).get("desc").toString());
             holder.imageView.setBackgroundResource((Integer)list.get(position).get("image"));
         }

         return convertView;
     }

 }

4、访问WEB代码

  public static List<EmpInfo> GetEmpInfo(String PageNum, String PageSize, String strwhere) {

         List<EmpInfo> listEmpinfo = new ArrayList<>();
         InputStreamReader in = null;
         try {
             final String SERVER_URL = GlobalAppliaction.WebUrl + "GetEmpList";
             HttpPost request = new HttpPost(SERVER_URL); // 根据内容来源地址创建一个Http请求
             List params = new ArrayList();
             params.add(new BasicNameValuePair("PageNum", PageNum)); // 添加必须的参数
             params.add(new BasicNameValuePair("PageSize", PageSize)); // 添加必须的参数
             params.add(new BasicNameValuePair("strwhere", strwhere)); // 添加必须的参数
             request.setEntity(new UrlEncodedFormEntity(params, org.apache.http.protocol.HTTP.UTF_8)); // 设置参数的编码
             HttpResponse httpResponse = new DefaultHttpClient().execute(request); // 发送请求并获取反馈

             // 解析返回的内容
             if (httpResponse.getStatusLine().getStatusCode() != ) {
                 InputStream inputStream = httpResponse.getEntity().getContent();
                 in = new InputStreamReader(inputStream);
                 BufferedReader bufferedReader = new BufferedReader(in);

                 StringBuffer strBuffer = new StringBuffer();
                 String line = null;
                 while ((line = bufferedReader.readLine()) != null) {
                     strBuffer.append(line);
                 }
                 inputStream.close();
                 bufferedReader.close();
                 String result = strBuffer.toString();

                 String errCode = "";

                 String strresult = "";
                 JSONObject root = new JSONObject(result);

                 errCode = root.getString("Code");
                 if (errCode.equals("")) {
                     strresult = root.getString("Result");

                     JSONArray array = root.getJSONArray("Result");//解析result
                     Gson gson = new Gson();
                     listEmpinfo = gson.fromJson(strresult, new TypeToken<List<EmpInfo>>() {
                     }.getType());

                 }

                 return listEmpinfo;

             }

         } catch (IOException e) {
             e.printStackTrace();
             Log.d("debug", e.toString());
             return null;
         } catch (JSONException e) {
             e.printStackTrace();
             return null;
         } finally {

             if (in != null) {
                 try {
                     in.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
         return listEmpinfo;
     }

5、UI展示获取结果

//启动后台任务
     GetWebResultTask   queryAddressTask = new GetWebResultTask();
//分页显示
        queryAddressTask.execute("", "", "");

  ArrayList<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
    Map<String, Object> map;
 public class GetWebResultTask extends AsyncTask<String, Integer, List<EmpInfo>> {
        @Override
        protected List<EmpInfo> doInBackground(String... params) {
            List<EmpInfo> GetResult = null;
            try {
                GetResult = WebByHttp.GetEmpInfo(params[], params[], params[]);

            } catch (Exception e) {
                e.printStackTrace();
            }
            //将结果返回给onPostExecute方法
            return GetResult;

        }

        //此方法可以在主线程改变UI
        protected void onPostExecute(List<EmpInfo> result) {

            try {

                for (int ii = ; ii < result.size(); ii++) {
                    map = new HashMap<String, Object>();
                    map.put("image", R.drawable.ic_launcher_background);
                    map.put("name", result.get(ii).EmpName);
                    map.put("desc", result.get(ii).CreateTime);
                    list.add(map);
                }
                myCustomAdapter = new MyCustomAdapter(list, getActivity());
                listviewemp.setAdapter(myCustomAdapter);
                listviewemp.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        Toast.makeText(getActivity(), list.get(position).get("name").toString(), Toast.LENGTH_LONG).show();
                    }
                });

            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }

6、界面效果