第二行代码coolweather项目的省级ListView点击之后一直加载

Question

package com.example.administrator.coolweather;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;import com.example.administrator.coolweather.db.City;
import com.example.administrator.coolweather.db.County;
import com.example.administrator.coolweather.db.Province;
import com.example.administrator.coolweather.util.HttpUtil;
import com.example.administrator.coolweather.util.Utility;import org.litepal.crud.DataSupport;import java.io.IOException;
import java.util.ArrayList;
import java.util.List;import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;/**
 * Created by Administrator on 2018/4/24.
 */public class ChooseAreaFragment extends Fragment {
    public static final int LEVEL_PROVINCE=0;
    public static final int LEVEL_CITY=1;
    public static final int LEVEL_COUNTY=2;
    private ProgressDialog progressDialog;
    private TextView titleText;
    private Button backButton;    private ListView listView;
    private ArrayAdapter<String> adapter;
    private List<String> dataList=new ArrayList<>();    private List<Province> provinceList;
    private List<City> cityList;
    private List<County> countyList;    private Province selectedProvince;
    private City selectedCity;
    //当前选中的级别
    private int currentLevel;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
        View view=inflater.inflate(R.layout.choose_area,container,false);
        titleText=(TextView)view.findViewById(R.id.title_text);
        backButton=(Button)view.findViewById(R.id.back_button);
        listView=(ListView)view.findViewById(R.id.list_view);
        adapter=new ArrayAdapter<>(getContext(),android.R.layout.simple_list_item_1,dataList);
        listView.setAdapter(adapter);
        return view;
    }    @Override
    public void onActivityCreated(Bundle savedInstanceState){
        super.onActivityCreated(savedInstanceState);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent,View view,int position,long id){
                if(currentLevel==LEVEL_PROVINCE){
                    selectedProvince=provinceList.get(position);
                    queryCities();
                }else if(currentLevel==LEVEL_CITY){
                    selectedCity=cityList.get(position);
                    queryCounties();
                }
            }
        });
        backButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                if(currentLevel==LEVEL_COUNTY){
                    queryCities();
                }else if(currentLevel==LEVEL_CITY){
                    queryProvinces();
                }
            }
        });
        queryProvinces();
    }    /*
    查询全国所有的省，先从数据库查询，如果没有查询到再去服务器上查询
    放到ListView中
     */
    private void queryProvinces(){
        titleText.setText("中国");
        backButton.setVisibility(View.GONE);
        provinceList= DataSupport.findAll(Province.class);
        if(provinceList.size()>0){
            dataList.clear();
            for(Province province:provinceList){
                dataList.add(province.getProvinceName()+" "+province.getProvinceCode()+" "+province.getId());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_PROVINCE;
        }else{
            String address="http://guolin.tech/api/china";
            queryFromServer(address,"province");
        }
    }    /*
    查询选中省内所有的市，优先从数据库查询，如果没有查询到再到服务器上查询
    放到ListView中
     */
    private void queryCities(){
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        cityList=DataSupport.where("provinceid = ?",String.valueOf(selectedProvince.getId())).find(City.class);
        if(cityList.size()>0){
            dataList.clear();
            for(City city:cityList){
                dataList.add(city.getCityName()+" "+city.getCityCode()+" "+city.getProvinceId());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_CITY;
        }else{
            int provinceCode=selectedProvince.getProvinceCode();
            String address="http://guolin.tech/api/china/"+provinceCode;
            queryFromServer(address,"city");
        }
    }    /*
    查询市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询
    放到ListView中
     */
    private void queryCounties(){
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        countyList=DataSupport.where("cityid = ?",String.valueOf(selectedCity.getId())).find(County.class);
        if(countyList.size()>0){
            dataList.clear();
            for(County county:countyList){
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_COUNTY;
        }else{
            int provinceCode=selectedProvince.getProvinceCode();
            int cityCode=selectedCity.getCityCode();
            String address="http://guolin.tech/api/china/"+provinceCode+"/"+cityCode;
            queryFromServer(address,"county");
        }
    }
    /*
    根据传入的地址和类型从服务器上查询数据
     */
    private void queryFromServer(String address,final String type){
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address,new Callback(){
            @Override
            public void onResponse(Call call,Response response)throws IOException{
                String responseText=response.body().toString();
                boolean result=false;
                //如果配对，把从服务器查询到的JSON数据配对到数据库中
                if("province".equals(type)){
                    result= Utility.handleProvinceResponse(responseText);
                }else if("city".equals(type)){
                    result=Utility.handleCityResponse(responseText,selectedProvince.getId());
                }else if("county".equals(type)){
                    result=Utility.handleCountyResponse(responseText,selectedCity.getId());
                }
                if(result){
                    getActivity().runOnUiThread(new Runnable(){
                        @Override
                        public void run(){
                            closeProgressDialog();
                            //从数据库中查询所有的省，放到ListView中
                            if("province".equals(type)){
                                queryProvinces();
                            }else if("city".equals(type)){
                                queryCities();
                            }else if("county".equals(type)){
                                queryCounties();
                            }
                        }
                    });
                }
            }            @Override
            public void onFailure(Call call,IOException e){
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(getContext(),"加载失败",Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }    /*
    显示进度对话框
     */
    private void showProgressDialog(){
        if(progressDialog==null){
            progressDialog=new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCanceledOnTouchOutside(false);
        }
        progressDialog.show();
    }    /*
    关闭进度对话框
     */
    private void closeProgressDialog(){
        if(progressDialog!=null){
            progressDialog.dismiss();
        }
    }
}

Answer 1

package com.example.administrator.coolweather.util;import android.text.TextUtils;import com.example.administrator.coolweather.db.City;
import com.example.administrator.coolweather.db.County;
import com.example.administrator.coolweather.db.Province;import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;/**
 * Created by Administrator on 2018/4/24.
 */public class Utility {    /**
     * 解析和处理服务器返回的省级数据
     */
    public static boolean handleProvinceResponse(String response) {
        if (!TextUtils.isEmpty(response)) {
            try {
                JSONArray allProvinces = new JSONArray(response);
                for (int i = 0; i < allProvinces.length(); i++) {
                    JSONObject provinceObject = allProvinces.getJSONObject(i);
                    Province province = new Province();
                    province.setProvinceName(provinceObject.getString("name"));
                    province.setProvinceCode(provinceObject.getInt("id"));
                    province.save();
                }
                return true;
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return false;
    }    /**
     * 解析和处理服务器返回的市级数据
     */
    public static boolean handleCityResponse(String response, int provinceId) {
        if (!TextUtils.isEmpty(response)) {
            try {
                JSONArray allCities = new JSONArray(response);
                for (int i = 0; i < allCities.length(); i++) {
                    JSONObject cityObject = allCities.getJSONObject(i);
                    City city = new City();
                    city.setCityName(cityObject.getString("name"));
                    city.setCityCode(cityObject.getInt("id"));
                    city.setProvinceId(provinceId);
                    city.save();
                }
                return true;
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return false;
    }    /**
     * 解析和处理服务器返回的县级数据
     */
    public static boolean handleCountyResponse(String response, int cityId) {
        if (!TextUtils.isEmpty(response)) {
            try {
                JSONArray allCounties = new JSONArray(response);
                for (int i = 0; i < allCounties.length(); i++) {
                    JSONObject countyObject = allCounties.getJSONObject(i);
                    County county = new County();
                    county.setCountyName(countyObject.getString("name"));
                    county.setWeatherId(countyObject.getString("weather_id"));
                    county.setCityId(cityId);
                    county.save();
                }
                return true;
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return false;
    }
}
package com.example.administrator.coolweather.util;import okhttp3.OkHttpClient;
import okhttp3.Request;/**
 * Created by Administrator on 2018/4/24.
 */public class HttpUtil {
    public static void sendOkHttpRequest(String address,okhttp3.Callback callback){
        OkHttpClient client=new OkHttpClient();
        Request request=new Request.Builder().url(address).build();
        client.newCall(request).enqueue(callback);
    }
}

Answer 2

你这个是不是没有给网络权限啊，自己再检查一下。还有就是郭霖大神不是在https://github.com/guolindev/booksource提供了源码么，你可以下载参考下,
下载下来的chapter14这个文件夹就是你这个项目