正在学习android的第一行代码的coolweather遇到了点问题

Question

ChooseAreaFragment代码
import android.app.ProgressDialog;
import android.os.Bundle;
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 androidx.appcompat.widget.ButtonBarLayout;
import androidx.fragment.app.Fragment;
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;
public class ChooseAreaFrament 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<>();

/**

• 省列表 */

private List provinceList;

/**

• 市列表 */

private List cityList;

/**

• 县列表 */ private ListcountyList;

/**

• 选中的省份 */ private Province selectedProvince;

/**

• 选中的城市 */ 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 view) {
        if (currentLevel == LEVEL_COUNTY) {
            queryCities();
        } else if (currentLevel == LEVEL_CITY){
            queryProvinces();
        }
    }
});
queryProvinces();

}

/**

• 查询全国所有的省，优先数据库查询，如果没有查询到再去服务器上查询 */ 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()); } adapter.notifyDataSetChanged(); listView.setSelection(0); currentLevel = LEVEL_PROVINCE; } else { String address = "http://guolin.tech/api/china"; queryFromServer(address,"province"); } }

/**

• 查询全国所有的城市，优先数据库查询，如果没有查询到再去服务器上查询 */

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());
}
adapter.notifyDataSetChanged();
listView.setSelection(0);
currentLevel = LEVEL_CITY;
}else{
int provinceCode = selectedProvince.getProvinceCode();
String address = "http://guolin.tech/api/china/" + provinceCode;
queryFromServer(address,"city");
}
}

/**

• 查询全国所有的县，优先数据库查询，如果没有查询到再去服务器上查询 */ 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省市县数据 */

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().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() {
                    closeProgressDialog();
                    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) {

        //通过runOnUiTread()方法回到主线程处理逻辑
        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();

  }
  }

Utility代码
import android.text.TextUtils;
import com.example.coolweather.db.City;
import com.example.coolweather.db.County;
import com.example.coolweather.db.Province;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
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;

}

/**

• 解析服务器和处理器返回的市级数据 */

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;
}

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;
}
复制代码
}
HttpUtil代码
import okhttp3.OkHttpClient;
import okhttp3.Request;
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);
}
复制代码
}
app
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.example.coolweather"
minSdkVersion 15
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
sourceSets {
main {
jniLibs.srcDirs = ['libs']
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'org.litepal.android:core:1.4.1'
implementation 'com.squareup.okhttp3:okhttp:3.4.1'
implementation 'com.google.code.gson:gson:2.7'
implementation 'com.github.bumptech.glide:glide:3.7.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

debug到这里就动不了

Answer 1

https://blog.csdn.net/chandelierr/article/details/52810876