1.貌似有问题的代码
package com.example.coolweather;
import android.app.Fragment;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
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.coolweather.db.City;
import com.example.coolweather.db.County;
import com.example.coolweather.db.Province;
import com.example.coolweather.util.HttpUtil;
import com.example.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 Airth on 2019/5/10.
*/
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 adapter;
private List dataList = new ArrayList<>();
private int currentLevel; //当前被选中的级别
private Province selectedProvince;//被选中的省份
private City selectedCity;//被选中的城市private List provinceList;//省列表
private List cityList;//市列表
private List countyList ;//县列表/*获取控件实例id*/
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
Log.d("ChooseAreaFragment","onCreateView");
View view = inflater.inflate(R.layout.choose_area,container,false);
titleText = (TextView)view.findViewById(R.id.title_text); //获取标题栏文本id
backButton = (Button) view.findViewById(R.id.back_button); //获取标题栏id
listView = (ListView)view.findViewById(R.id.list_view); //获取Item列表id
//获取ArrayAdapter对象
adapter =new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
listView.setAdapter(adapter);//设置并初始化适配器
return view;//将视图返回
}/*点击事件集合*/
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
Log.d("ChooseAreaFragment","onActivityCreated");
super.onActivityCreated(savedInstanceState);
//列表任意一栏被点击，则...
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d("ChooseAreaFragment","列表被点了的...");
if (currentLevel == LEVEL_PROVINCE){ //当前选中的级别为省份时
selectedProvince = provinceList.get(position); //当前点击为选中状态
queryCities();//查询市的方法
}
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();
}
private void queryCities() {
titleText.setText(selectedProvince.getProvinceName()); //设置市的标题内容
backButton.setVisibility(View.VISIBLE); //设置返回按钮可见
//查询被选中的省份城市的市区
cityList = DataSupport.where("provinceid=?",String.valueOf(selectedProvince.
getId())).find(City.class);
Log.d("ChooseAreaFragment","市级");
if (cityList.size()>0){ //如果省列表不为空，则...
dataList.clear();
for (City city:cityList){ //遍历每一份省的市级城市
dataList.add(city.getCityName()); //添加到数据列表中
}
adapter.notifyDataSetChanged();//通知适配器数据更新了
listView.setSelection(0);
currentLevel = LEVEL_CITY;
}
else{
int provinceCode = selectedProvince.getProvinceCode(); //获取被选取省级代码
String address = "http://guolin.tech/api/china/"+provinceCode;//获取被选取地区的网络地址
Log.d("ChooseAreaFragment","准备在网络中获取地址信息");
queryFromServer(address,"city"); // 在网络中查询
}
}
/*根据传入的地址和类型从服务器查询省市县数据*/
private void queryFromServer(String adress, final String type) {
showProgressDialog();
// 发送一条网络请求
HttpUtil.sendOKHttpRequest(adress, new Callback() {
//请求加载失败
@Override
public void onFailure(Call call, IOException e) {
//通过runOnUiThread方法回到主线程逻辑
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
closeProgressDialog();
Toast.makeText(getContext(),"加载失败",Toast.LENGTH_SHORT).show();
}
});
}@Override public void onResponse(Call call, Response response) throws IOException { Log.d("ChooseAreaFragment","加载地区信息..."); String responseText = response.body().string(); boolean result = false; 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() { Log.d("ChooseAreaFragment","开启线程更新UI"); closeProgressDialog(); if ("province".equals(type)){ queryProvinces(); } else if ("city".equals(type)){ queryCities(); } else if ("county".equals(type)){ queryCounties(); } } }); } if ("city".equals(type)){ result = Utility.handleProvinceResponse(responseText); } if ("county".equals(type)){ result = Utility.handleProvinceResponse(responseText); } } });}
/*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();}
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");
}
}/*全国所有的省，优先查询数据库，如果没有再去服务器查询*/
private void queryProvinces() {
titleText.setText("中国");
Log.d("ChooseAreaFragment","查询省中...");
backButton.setVisibility(View.GONE);
provinceList = DataSupport.findAll(Province.class);
if (provinceList.size()>0){
dataList.clear();
for (Province province:provinceList){
dataList.add(province.getProvinceName());
}
adapter.notifyDataSetChanged();
listView.setSelection(0);
currentLevel = LEVEL_PROVINCE;
}
else {
Log.d("ChooseAreaFragment","服务器查询省中...");
String address = "http://guolin.tech/api/china";
queryFromServer(address,"province");
}
}
private void closeProgressDialog() {
if (progressDialog!=null){
progressDialog.dismiss();
}
}
}
2.这是报错日志
