《第一行代码》阅读笔记（三十六）——酷欧天气
准备工作
首先大家看看郭神为咱们提供的接口
http://guolin.tech/api/china
然后再去和风天气上面注册一个账号
http://guolin.tech/api/weather/register
点击“应用管理”->“创建应用”
之后根据提示分三步，输入自己的App名，是Web、iOS还是android，然后确认Keyname和包名。包名就是你项目的路径
如图所示，就完成了
托管到个人Github上面。郭神讲解的十分底层，更方便的方法就在Android Studio中。感兴趣的朋友可以观看笔者的另一篇博客。Git使用教程
创建数据库
第一步：导入依赖
implementation 'com.squareup.okhttp3:logging-interceptor:3.8.0'
implementation 'com.squareup.okhttp3:okhttp:3.8.0'
implementation 'com.google.code.gson:gson:2.8.6'
implementation 'org.litepal.guolindev:core:3.1.1'
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
第二步：创建表（实体类）
在db中创建三个实体类
public class Province extends LitePalSupport {
private int id;
private String provinceName;
private int provinceCode;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getProvinceName() {
return provinceName;
}
public void setProvinceName(String provinceName) {
this.provinceName = provinceName;
}
public int getProvinceCode() {
return provinceCode;
}
public void setProvinceCode(int provinceCode) {
this.provinceCode = provinceCode;
}
}
public class City extends LitePalSupport {
private int id;
private String cityName;
private int cityCode;
private int provinceId;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public int getCityCode() {
return cityCode;
}
public void setCityCode(int cityCode) {
this.cityCode = cityCode;
}
public int getProvinceId() {
return provinceId;
}
public void setProvinceId(int provinceId) {
this.provinceId = provinceId;
}
}
public class County extends LitePalSupport {
private int id;
private String countyName;
private String weatherId;
private int cityId;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCountyName() {
return countyName;
}
public void setCountyName(String countyName) {
this.countyName = countyName;
}
public String getWeatherId() {
return weatherId;
}
public void setWeatherId(String weatherId) {
this.weatherId = weatherId;
}
public int getCityId() {
return cityId;
}
public void setCityId(int cityId) {
this.cityId = cityId;
}
}
添加映射以及数据库配置
<?xml version="1.0" encoding="utf-8" ?>
<litepal>
<dbname value="cool_weather" />
<version value="1" />
<list>
<mapping class="com.firstcode.coolweather.db.Province" />
<mapping class="com.firstcode.coolweather.db.City" />
<mapping class="com.firstcode.coolweather.db.County" />
</list>
</litepal>
最后在AndroidManifest.xml添加属性
android:name="org.litepal.LitePalApplication"
遍历全国省市县数据
第一步：添加HttpUtil工具类
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);
}
}
第二步：添加Utility工具类
public class Utility {
//省级
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;
}
//市级
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;
}
//县级
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;
}
}
逻辑非常简单，就是处理API取回的json串，然后存在数据库中。
第三步：添加布局choose_area.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary">
<TextView
android:id="@+id/title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#fff"
android:textSize="20sp" />
<Button
android:id="@+id/back_button"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginStart="10dp"
android:background="@drawable/ic_back" />
</RelativeLayout>
<ListView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
非常简单的布局，为啥使用ListView，郭神说怎么简单怎么来
第四步：编写Fragment
public class ChooseAreaFragment extends Fragment {
private static final String TAG = "ChooseAreaFragment";
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;//省列表
private List<City> cityList;//市列表
private List<County> countyList;//县列表
private Province selectedProvince;//选中的省份
private City selectedCity;//选中的城市
private int currentLevel;//当前选中的级别
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.choose_area, container, false);
titleText = view.findViewById(R.id.title_text);
backButton = view.findViewById(R.id.back_button);
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，优先从数据库查询，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 = LitePal.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");
}
}
/**
* 查询选中省内所有的市，优先从数据库查询，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 = LitePal.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");
}
}
/**
* 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询。
*/
private void queryCounties() {
titleText.setText(selectedCity.getCityName());
backButton.setVisibility(View.VISIBLE);
countyList = LitePal.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runOnUiThread()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();
}
}
}
第五步：添加Fragment到主Activity布局
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<fragment
android:id="@+id/choose_area_fragment"
android:name="com.firstcode.coolweather.ChooseAreaFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
第六步：取消actionbar
