最近总是有人来和我说我以前写的一个小app无法正常获取数据~Android简易版天气预报app
今天就又运行了下来查找问题，发现或许是接口有限制吧，不能在多台手机使用同个apikey
然后，发现了我写的代码实在乱七八糟，界面也实在不好看，就又重写了一遍，小小地修改了一遍，开发环境改为了Android Studio
最终效果图如下
工程图如下
一、获取地区信息
做这么一个天气预报app，首先就要获取到国内地区列表
（在我的另一篇博客有介绍：向任意网址发起数据请求）
中国天气网开放有天气预报接口，访问“http://www.weather.com.cn/data/list3/city.xml”就可以获取到国内省份列表以及其代号了
如果想要获取广东省下的城市列表，由上图可知广东省的代号为28，则接口地址是 “http://www.weather.com.cn/data/list3/city28.xml”，获取到的城市列表及代号如下：
依次类推还可以获取到更加详细的地区信息，这样就完成了开头部分
二、天气信息的获取
百度的APIStore拥有丰富的接口，涵盖了生活的许多方面。例如，我们就可以通过APIStore的某个接口获取到含有天气信息的JSON数据，从而实现天气预报功能
(在我的另一篇博客有介绍：获取含天气信息的JSON数据)
首先，使用者要有一个百度账号，然后登陆以下网址：中国和世界天气预报
该接口是免费的，不过因此也就不够稳定，我在调试的时候就经常出错
然后在API选项下点击“您自己的apikey”，查看自己的apikey。该值是每个开发者和app的唯一标识，需要妥善保管，有了apikey才可以进行下一步的操作
获取到的天气信息是JSON格式的，需要在程序中再来解析
三、数据库的设计
地区列表这些信息一般都是固定不变的，所以我们可以把第一次联网获取到的数据存进数据库里，下次再次访问时就从数据库里读取即可
首先要设定四个Model，包括：省份、城市、县、每小时天气预测，用来承载数据
每个Model包括几个属性以及相应的get和set方法
例如，省份Province的设计如下所示，城市City和县County的设计类似
/** * 省份 */ public class Province { //省份名 private String provinceName; //省份ID private String provinceId; public String getProvinceId() { return provinceId; } public String getProvinceName() { return provinceName; } public void setProvinceId(String provinceId) { this.provinceId = provinceId; } public void setProvinceName(String provinceName) { this.provinceName = provinceName; } }
每小时天气预测HourlyWeather的设计如下：
/** * Created by ZY on 2016/7/21. */ public class HourlyWeather { //预测时间 private String time; //温度 private String temp; //降水概率 private String pop; //风力 private String wind; public HourlyWeather(String time, String temp, String pop, String wind) { this.time = time; this.temp = temp; this.pop = pop; this.wind = wind; } public String getTime() { return time; } public String getTemp() { return temp; } public String getPop() { return pop; } public String getWind() { return wind; } }
然后，新建一个DatabaseHelper类继承于SQLiteOpenHelper，用来建立三个数据库表
public class DatabaseHelper extends SQLiteOpenHelper { private final String CREATE_PROVINCE = "create table Province (" + "provinceName text," + "provinceId text )"; private final String CREATE_CITY = "create table City(" + "cityName text," + "cityId text," + "provinceId text)"; private final String CREATE_COUNTY = "create table County(" + "countyName text," + "countyId text," + "cityId text)"; public DatabaseHelper(Context context, String DbName, CursorFactory factory, int version) { super(context, DbName, factory, version); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_PROVINCE); db.execSQL(CREATE_CITY); db.execSQL(CREATE_COUNTY); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } }
然后，再建立一个WeatherDB类，用来进行实际的数据库操作，包括存取省份信息、城市信息、县信息等
需要注意的是，因为每个城市都是包含在某个省份下的，所以查询某个省份下的所有城市列表，需要将省份的ID传入作为唯一标识
public class WeatherDB { private final String DataBaseName = "ZyWeather"; private final int VERSION = 1; private SQLiteDatabase database; private static WeatherDB weatherDB; private WeatherDB(Context context) { DatabaseHelper dataBaseHelper = new DatabaseHelper(context, DataBaseName, null, VERSION); database = dataBaseHelper.getWritableDatabase(); } //获取实例 public static WeatherDB getInstance(Context context) { if (weatherDB == null) { weatherDB = new WeatherDB(context); } return weatherDB; } //保存省份信息 public void saveProvinces(List<Province> provinceList) { if (provinceList != null && provinceList.size() > 0) { ContentValues values = new ContentValues(); for (int i = 0; i < provinceList.size(); i++) { values.put("provinceName", provinceList.get(i).getProvinceName()); values.put("provinceId", provinceList.get(i).getProvinceId()); database.insert("Province", null, values); values.clear(); } } } //保存城市信息 public void saveCities(List<City> cityList) { if (cityList != null && cityList.size() > 0) { ContentValues values = new ContentValues(); for (int i = 0; i < cityList.size(); i++) { values.put("cityName", cityList.get(i).getCityName()); values.put("cityId", cityList.get(i).getCityId()); values.put("provinceId", cityList.get(i).getProvinceId()); database.insert("City", null, values); values.clear(); } } } //保存乡村信息 public void saveCounties(List<County> countyList) { if (countyList != null && countyList.size() > 0) { ContentValues values = new ContentValues(); for (int i = 0; i < countyList.size(); i++) { values.put("countyName", countyList.get(i).getCountyName()); values.put("countyId", countyList.get(i).getCountyId()); values.put("cityId", countyList.get(i).getCityId()); database.insert("County", null, values); values.clear(); } } } //返回所有省份信息 public List<Province> getAllProvince() { Cursor cursor = database.query("Province", null, null, null, null, null, null); List<Province> list = new ArrayList<>(); Province province; if (cursor.moveToFirst()) { do { province = new Province(); province.setProvinceName(cursor.getString(cursor.getColumnIndex("provinceName"))); province.setProvinceId(cursor.getString(cursor.getColumnIndex("provinceId"))); list.add(province); } while (cursor.moveToNext()); } return list; } //返回指定省份下的所有城市 public List<City> getAllCity(String provinceId) { List<City> list = new ArrayList<>(); City city; Cursor cursor = database.query("City", null, "provinceId = ", new String[]{provinceId}, null, null, null); if (cursor.moveToFirst()) { do { city = new City(); city.setCityName(cursor.getString(cursor.getColumnIndex("cityName"))); city.setCityId(cursor.getString(cursor.getColumnIndex("cityId"))); city.setProvinceId(provinceId); list.add(city); } while (cursor.moveToNext()); } return list; } //返回指定城市下的所有乡村 public List<County> getAllCountry(String cityId) { List<County> list = new ArrayList<>(); Cursor cursor = database.query("County", null, "cityId=", new String[]{cityId}, null, null, null); County county; if (cursor.moveToFirst()) { do { county = new County(); county.setCountyName(cursor.getString(cursor.getColumnIndex("countyName"))); county.setCountyId(cursor.getString(cursor.getColumnIndex("countyId"))); county.setCityId(cityId); list.add(county); } while (cursor.moveToNext()); } return list; } }
四、联网操作
整个app用同一个函数来完成各种数据数据操作，该函数包含在HttpUtil类下，为静态函数
当中需要填入自己申请的apikey，该key仅在获取天气信息时有用，在获取地区信息时是不需要的，这里只是为了简便，所以就一起写上了
public class HttpUtil { public static void sendHttpRequest(final String address, final HttpCallbackListener listener) { new Thread(new Runnable() { public void run() { HttpURLConnection connection = null; try { URL url = new URL(address); connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(8000); connection.setReadTimeout(8000); connection.setRequestProperty("apikey", "填入自己的apikey"); connection.connect(); InputStream inputStream = connection.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); StringBuilder response = new StringBuilder(); String line; while ((line = bufferedReader.readLine()) != null) { response.append(line); } if (listener != null) { listener.onFinish(response.toString()); } } catch (Exception e) { if (listener != null) { listener.onError(e); } } finally { if (connection != null) { connection.disconnect(); } } } }).start(); } }
五、工具类
在联网访问数据成功或失败后，都需要通过回调方法进行数据处理，所以需要设定一个接口HttpCallbackListener
public interface HttpCallbackListener { void onFinish(String response); void onError(Exception e); }
此外，使用HttpUtil 类获取到地区信息后，因为数据包含一些分隔符，无法直接存入数据库，而且获取到的天气信息也是JSON格式的，也需要进行数据解析，所以还需要有一个Utility类用来进行数据处理
public class Utility { // 保存服务器返回的省级数据 public static boolean saveProvincesResponse(WeatherDB weatherDB, String response) { if (!TextUtils.isEmpty(response)) { String[] allProvinces = response.split(","); if (allProvinces != null && allProvinces.length > 0) { Province province; List<Province> provinceList = new ArrayList<>(); for (String p : allProvinces) { String[] array = p.split("|"); province = new Province(); province.setProvinceId(array[0]); province.setProvinceName(array[1]); provinceList.add(province); } weatherDB.saveProvinces(provinceList); return true; } } return false; } // 保存服务器返回的市级数据 public static boolean saveCitiesResponse(WeatherDB weatherDB, String response, String provinceId) { if (!TextUtils.isEmpty(response)) { String[] allCities = response.split(","); if (allCities != null && allCities.length > 0) { City city; List<City> cityList = new ArrayList<>(); for (String c : allCities) { String[] array = c.split("|"); city = new City(); city.setCityId(array[0]); city.setCityName(array[1]); city.setProvinceId(provinceId); cityList.add(city); } weatherDB.saveCities(cityList); return true; } } return false; } // 保存服务器返回的县级数据 public static boolean saveCountiesResponse(WeatherDB weatherDB, String response, String cityId) { if (!TextUtils.isEmpty(response)) { String[] allCounties = response.split(","); if (allCounties != null && allCounties.length > 0) { County county; List<County> countyList = new ArrayList<>(); for (String c : allCounties) { String[] array = c.split("|"); county = new County(); county.setCountyId(array[0]); county.setCountyName(array[1]); county.setCityId(cityId); countyList.add(county); } weatherDB.saveCounties(countyList); return true; } } return false; } // 处理服务器返回的json数据 public static void handleWeatherResponse(Context context, String response) { try { JSONObject jsonobject = new JSONObject(response); JSONArray title = jsonobject.getJSONArray("HeWeather data service 3.0"); JSONObject first_object = (JSONObject) title.get(0); JSONObject basic = (JSONObject) first_object.get("basic"); //更新时间 JSONObject update = (JSONObject) basic.get("update"); JSONArray daily_forecast = (JSONArray) first_object.get("daily_forecast"); JSONObject daily_forecast_first = (JSONObject) daily_forecast.get(0); JSONObject cond = (JSONObject) daily_forecast_first.get("cond"); //温度 JSONObject temp = (JSONObject) daily_forecast_first.get("tmp"); JSONObject astro = (JSONObject) daily_forecast_first.get("astro"); JSONObject wind = (JSONObject) daily_forecast_first.get("wind"); JSONArray hourly_forecast = (JSONArray) first_object.get("hourly_forecast"); WeatherActivity.weatherList.clear(); for (int i = 0; i < hourly_forecast.length(); i++) { JSONObject json = hourly_forecast.getJSONObject(i); JSONObject json_wind = (JSONObject) json.get("wind"); String date = json.getString("date"); String[] array = date.split(" "); String dir = json_wind.getString("dir"); String sc = json_wind.getString("sc"); String hourly_clock = array[1]; String hourly_temp = "温度：" + json.getString("tmp") + "℃"; String hourly_pop = "降水概率：" + json.getString("pop"); String hourly_wind = "风力：" + dir + " " + sc + "级"; HourlyWeather weather = new HourlyWeather(hourly_clock, hourly_temp, hourly_pop, hourly_wind); WeatherActivity.weatherList.add(weather); } //日出 String sunriseTime = astro.getString("sr"); //日落 String sunsetTime = astro.getString("ss"); //白天天气 String dayWeather = cond.getString("txt_d"); //夜晚天气 String nightWeather = cond.getString("txt_n"); //风力 String windText = wind.getString("dir") + " " + wind.getString("sc") + "级"; //降水概率 String pop = daily_forecast_first.getString("pop"); //温度 String tempText = temp.getString("min") + "℃~" + temp.getString("max") + "℃"; //更新时间 String updateTime = update.getString("loc"); //城市名 String cityName = basic.getString("city"); saveWeatherInfo(context, cityName, sunriseTime, sunsetTime, dayWeather, nightWeather, windText, pop, tempText, updateTime); } catch (Exception e) { e.printStackTrace(); } } private static void saveWeatherInfo(Context context, String cityName, String sunriseTime, String sunsetTime, String dayWeather, String nightWeather, String windText, String pop, String tempText, String updateTime) { SharedPreferences.Editor editor = context.getSharedPreferences("Weather", Context.MODE_PRIVATE).edit(); editor.putString("cityName", cityName); editor.putString("sunriseTime", sunriseTime); editor.putString("sunsetTime", sunsetTime); editor.putString("dayWeather", dayWeather); editor.putString("nightWeather", nightWeather); editor.putString("wind", windText); editor.putString("pop", pop); editor.putString("temp", tempText); editor.putString("updateTime", updateTime); editor.commit(); } }
六、适配器
由上边的动态图可以看到每小时的天气预测信息，那是使用ListView呈现的，这就要为其提供一个适配器了
ListView使用的布局文件如下：
<"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:orientation="horizontal"> <> <TextView android:id="@+id/forecastTime" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="2" android:gravity="center" android:textSize="20sp" android:textStyle="bold" /> <LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="5" android:orientation="vertical"> <> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:gravity="center" android:orientation="horizontal"> <> <TextView android:id="@+id/forecastTemp" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" /> <> <TextView android:id="@+id/forecastPop" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" /> </LinearLayout> <> <TextView android:id="@+id/forecastWind" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:gravity="center" /> </LinearLayout> </LinearLayout>
然后新建一个WeatherAdapter继承于ArrayAdapter< HourlyWeather>
只要重写getView(int position, View convertView, ViewGroup parent)方法即可
public class WeatherAdapter extends ArrayAdapter<HourlyWeather> { private int resourceId; private Context context; public WeatherAdapter(Context context, int textViewResourceId, List<HourlyWeather> objects) { super(context, textViewResourceId, objects); this.context = context; this.resourceId = textViewResourceId; } public View getView(int position, View convertView, ViewGroup parent) { HourlyWeather weather = getItem(position); View view = LayoutInflater.from(context).inflate(resourceId, null); TextView forecastTime = (TextView) view.findViewById(R.id.forecastTime); TextView forecastTemp = (TextView) view.findViewById(R.id.forecastTemp); TextView forecastPop = (TextView) view.findViewById(R.id.forecastPop); TextView forecastWind = (TextView) view.findViewById(R.id.forecastWind); forecastTime.setText(weather.getTime()); forecastTemp.setText(weather.getTemp()); forecastPop.setText(weather.getPop()); forecastWind.setText(weather.getWind()); return view; } }
七、Activity的编写
首先要完成地区选择界面ChooseAreaActivity
ChooseAreaActivity的界面仅包括一个居中的TextView和一个ListView
布局文件如下：
<"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:orientation="vertical"> <RelativeLayout android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textSize="24sp" /> </RelativeLayout> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
ChooseAreaActivity 需要完成的操作有：完成地区列表的加载、将选择的County名传递给WeatherActivity
此外，当中使用了showProgressDialog()来呈现一个进度对话框，也设为无法通过返回键关闭，而我又没有在弱网环境下调试过，每次加载都是很快，也没见到对话框出来过，所以也不知道showProgressDialog()到底有没有bug啥的~
public class ChooseAreaActivity extends AppCompatActivity { // 标记当前列表为省份 public static final int LEVEL_PROVINCE = 0; // 标记当前列表为城市 public static final int LEVEL_CITY = 1; // 标记当前列表为县 public static final int LEVEL_COUNTY = 2; // 进度对话框 private ProgressDialog progressDialog; // 标题栏 private TextView titleText; // 数据列表 private ListView listView; // 列表数据 private ArrayAdapter<String> adapter; // 数据库 private WeatherDB weatherDB; private List<String> dataList; private List<Province> provinceList; private List<City> cityList; private List<County> countyList; //选择的省份 private Province selectedProvince; //选择的城市 private City selectedCity; //当前选择的列表类型 private int currentLevel; //标记是否从WeatherActivity跳转而来的 private boolean isFromWeatherActivity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); isFromWeatherActivity = getIntent().getBooleanExtra("ChooseArea", false); SharedPreferences sharedPreferences = getSharedPreferences("Weather", Context.MODE_PRIVATE); // 如果country已选择且本Activity不是从天气界面启动而来的，则直接跳转到WeatherActivity if (!TextUtils.isEmpty(sharedPreferences.getString("CountyName", "")) && !isFromWeatherActivity) { Intent intent = new Intent(this, WeatherActivity.class); startActivity(intent); finish(); return; } setContentView(R.layout.activity_choose_area); if (getSupportActionBar() != null) { getSupportActionBar().hide(); } listView = (ListView) findViewById(R.id.listView); titleText = (TextView) findViewById(R.id.title); dataList = new ArrayList<>(); adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, dataList); listView.setAdapter(adapter); weatherDB = WeatherDB.getInstance(this); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int index, long arg3) { if (currentLevel == LEVEL_PROVINCE) { selectedProvince = provinceList.get(index); queryCities(); } else if (currentLevel == LEVEL_CITY) { selectedCity = cityList.get(index); queryCounties(); } else if (currentLevel == LEVEL_COUNTY) { //当点击到县列表时，就利用Intent跳转到天气信息界面 String countyName = countyList.get(index).getCountyName(); Intent intent = new Intent(ChooseAreaActivity.this, WeatherActivity.class); intent.putExtra("CountyName", countyName); startActivity(intent); finish(); } } }); queryProvinces(); } private void queryProvinces() { showProgressDialog(); provinceList = weatherDB.getAllProvince(); if (provinceList.size() > 0) { dataList.clear(); for (Province province : provinceList) { dataList.add(province.getProvinceName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText("中国"); currentLevel = LEVEL_PROVINCE; closeProgressDialog(); } else { queryFromServer(null, "province"); } } private void queryCities() { showProgressDialog(); cityList = weatherDB.getAllCity(selectedProvince.getProvinceId()); if (cityList.size() > 0) { dataList.clear(); for (City city : cityList) { dataList.add(city.getCityName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText(selectedProvince.getProvinceName()); currentLevel = LEVEL_CITY; closeProgressDialog(); } else { queryFromServer(selectedProvince.getProvinceId(), "city"); } } private void queryCounties() { showProgressDialog(); countyList = weatherDB.getAllCountry(selectedCity.getCityId()); if (countyList.size() > 0) { dataList.clear(); for (County county : countyList) { dataList.add(county.getCountyName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText(selectedCity.getCityName()); currentLevel = LEVEL_COUNTY; closeProgressDialog(); } else { queryFromServer(selectedCity.getCityId(), "county"); } } private void queryFromServer(final String code, final String type) { String address; // code不为空 if (!TextUtils.isEmpty(code)) { address = "http://www.weather.com.cn/data/list3/city" + code + ".xml"; } else { address = "http://www.weather.com.cn/data/list3/city.xml"; } HttpUtil.sendHttpRequest(address, new HttpCallbackListener() { @Override public void onFinish(String response) { boolean result = false; if ("province".equals(type)) { result = Utility.saveProvincesResponse(weatherDB, response); } else if ("city".equals(type)) { result = Utility.saveCitiesResponse(weatherDB, response, selectedProvince.getProvinceId()); } else if ("county".equals(type)) { result = Utility.saveCountiesResponse(weatherDB, response, selectedCity.getCityId()); } if (result) { runOnUiThread(new Runnable() { @Override public void run() { if ("province".equals(type)) { queryProvinces(); } else if ("city".equals(type)) { queryCities(); } else if ("county".equals(type)) { queryCounties(); } } }); } } @Override public void onError(Exception e) { runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(ChooseAreaActivity.this, "加载失败", Toast.LENGTH_SHORT).show(); } }); } }); closeProgressDialog(); } private void showProgressDialog() { if (progressDialog == null) { progressDialog = new ProgressDialog(this); progressDialog.setMessage("正在加载……"); progressDialog.setCanceledOnTouchOutside(false); } progressDialog.show(); } private void closeProgressDialog() { if (progressDialog != null) { progressDialog.dismiss(); } } @Override public void onBackPressed() { if (currentLevel == LEVEL_COUNTY) { queryCities(); } else if (currentLevel == LEVEL_CITY) { queryProvinces(); } else { if (isFromWeatherActivity) { Intent intent = new Intent(this, WeatherActivity.class); startActivity(intent); } finish(); } } }
WeatherActivity的布局相对复杂些，包含了许多个TextView，我也只是想着简单就好，就简单地把数据用文本呈现出来
// 城市切换按钮 private Button citySwitch; // 刷新数据按钮 private Button weatherRefresh; // 城市名 private TextView cityName; // 白天夜晚天气描叙 private TextView DayNightWeather; // 温度 private TextView temp; // 日出时间 private TextView sunriseTime; // 日落时间 private TextView sunsetTime; // 风力 private TextView wind; // 降水概率 private TextView pop; // 发布时间 private TextView updateTime; // 今日天气预测列表 private ListView listview; public static List<HourlyWeather> weatherList = new ArrayList<>(); private SharedPreferences sharedPreferences; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.weather); if (getSupportActionBar() != null) { getSupportActionBar().hide(); } init(); } private void init() { citySwitch = (Button) findViewById(R.id.citySwitch); weatherRefresh = (Button) findViewById(R.id.weatherRefresh); citySwitch.setOnClickListener(this); weatherRefresh.setOnClickListener(this); cityName = (TextView) findViewById(R.id.cityName); DayNightWeather = (TextView) findViewById(R.id.DayNightWeather); temp = (TextView) findViewById(R.id.temp); sunriseTime = (TextView) findViewById(R.id.sunriseTime); sunsetTime = (TextView) findViewById(R.id.sunsetTime); wind = (TextView) findViewById(R.id.wind); pop = (TextView) findViewById(R.id.pop); updateTime = (TextView) findViewById(R.id.updateTime); listview = (ListView) findViewById(R.id.hourlyForecast); sharedPreferences = getSharedPreferences("Weather", Context.MODE_PRIVATE); String countyName = getIntent().getStringExtra("CountyName"); // 当countyName不为空 if (!TextUtils.isEmpty(countyName)) { SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putString("CountyName", countyName); editor.commit(); } else { countyName = sharedPreferences.getString("CountyName", ""); } weatherRefresh.setText("同步中……"); queryFromServer(countyName); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.citySwitch: Intent intent = new Intent(this, ChooseAreaActivity.class); intent.putExtra("ChooseArea", true); startActivity(intent); finish(); break; case R.id.weatherRefresh: weatherRefresh.setText("同步中……"); String countyName = sharedPreferences.getString("CountyName", ""); if (!TextUtils.isEmpty(countyName)) { queryFromServer(countyName); } break; } } private void queryFromServer(final String countyName) { try { String url = "http://apis.baidu.com/heweather/weather/free"; String name = new String(countyName.getBytes("UTF-8"), "iso-8859-1"); HttpUtil.sendHttpRequest(url + name, new HttpCallbackListener() { @Override public void onFinish(String response) { Utility.handleWeatherResponse(WeatherActivity.this, response); runOnUiThread(new Runnable() { @Override public void run() { showWeather(); } }); } @Override public void onError(Exception e) { runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(WeatherActivity.this, "同步失败", Toast.LENGTH_LONG).show(); weatherRefresh.setText("更新数据"); } }); } }); } catch (Exception e) { e.printStackTrace(); } } private void showWeather() { cityName.setText(sharedPreferences.getString("cityName", "未知")); sunriseTime.setText("日出：" + sharedPreferences.getString("sunriseTime", "未知")); sunsetTime.setText("日落：" + sharedPreferences.getString("sunsetTime", "未知")); DayNightWeather.setText("日：" + sharedPreferences.getString("dayWeather", "未知") + " 夜：" + sharedPreferences.getString("nightWeather", "未知")); temp.setText("温度：" + sharedPreferences.getString("temp", "未知")); wind.setText("风力：" + sharedPreferences.getString("wind", "未知")); pop.setText("降水概率：" + sharedPreferences.getString("pop", "未知")); updateTime.setText("发布时间:" + sharedPreferences.getString("updateTime", "未知")); WeatherAdapter adapter = new WeatherAdapter(this, R.layout.hourly_weather, weatherList); listview.setAdapter(adapter); Toast.makeText(WeatherActivity.this, "已经是最新数据了", Toast.LENGTH_SHORT).show(); weatherRefresh.setText("更新数据"); } }
八、说明
很奇怪的是，这个小app在我的4.4版本的小米手机上运行无误，可在5.1系统的模拟器和华为手机上却提示无法获取到数据，返回的JSON数据提示说城市未知，查看了很久也没搞明白，只能作罢~~
代码下载地址：Android简易版天气预报app的实现（改进版）
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