天气预报

一、功能需求及技术可行性分析

天气中至少应该具备以下功能。

1.        可以罗列出全国所有的省、市、县。

2.        可以查看全国任意城市的天气信息。

3.        可以自由地切换城市，去查看其他城市的天气。

4.        提供手动更新以及后台自动更新天气的功能。

 

二、界面效果图

 

三、核心代码

WeatherActivity。java

public class WeatherActivity extends Activity implements OnClickListener{private LinearLayout weatherInfoLayout;/** * 用于显示城市名 */private TextView cityNameText;/** * 用于显示发布时间 */private TextView publishText;/** * 用于显示天气描述信息 */private TextView weatherDespText;/** * 用于显示气温1 */private TextView temp1Text;/** * 用于显示气温2 */private TextView temp2Text;/** * 用于显示当前日期 */private TextView currentDateText;/** * 切换城市按钮 */private Button switchCity;/** * 更新天气按钮 */private Button refreshWeather;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.weather_layout);// 初始化各控件weatherInfoLayout = (LinearLayout) findViewById(R.id.weather_info_layout);cityNameText = (TextView) findViewById(R.id.city_name);publishText = (TextView) findViewById(R.id.publish_text);weatherDespText = (TextView) findViewById(R.id.weather_desp);temp1Text = (TextView) findViewById(R.id.temp1);temp2Text = (TextView) findViewById(R.id.temp2);currentDateText = (TextView) findViewById(R.id.current_date);switchCity = (Button) findViewById(R.id.switch_city);refreshWeather = (Button) findViewById(R.id.refresh_weather);String countyCode = getIntent().getStringExtra("county_code");if (!TextUtils.isEmpty(countyCode)) {// 有县级代号时就去查询天气publishText.setText("同步中...");weatherInfoLayout.setVisibility(View.INVISIBLE);cityNameText.setVisibility(View.INVISIBLE);queryWeatherCode(countyCode);} else {// 没有县级代号时就直接显示本地天气showWeather();}switchCity = (Button) findViewById(R.id.switch_city);refreshWeather = (Button) findViewById(R.id.refresh_weather);switchCity.setOnClickListener(this);refreshWeather.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.switch_city:Intent intent = new Intent(this, ChooseAreaActivity.class);intent.putExtra("from_weather_activity", true);startActivity(intent);finish();break;case R.id.refresh_weather:publishText.setText("同步中...");SharedPreferences prefs = PreferenceManager. getDefaultSharedPreferences(this);String weatherCode = prefs.getString("weather_code", "");if (!TextUtils.isEmpty(weatherCode)) {queryWeatherInfo(weatherCode);}break;default:break;}}/** * 查询县级代号所对应的天气代号。 */private void queryWeatherCode(String countyCode) {String address = "http://www.weather.com.cn/data/list3/city" + countyCode + ".xml";queryFromServer(address, "countyCode");}/** * 查询天气代号所对应的天气。 */private void queryWeatherInfo(String weatherCode) {String address = "http://www.weather.com.cn/data/cityinfo/" + weatherCode + ".html";queryFromServer(address, "weatherCode");}/** * 根据传入的地址和类型去向服务器查询天气代号或者天气信息。 */private void queryFromServer(final String address, final String type) {HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {@Overridepublic void onFinish(final String response) {if ("countyCode".equals(type)) {if (!TextUtils.isEmpty(response)) {// 从服务器返回的数据中解析出天气代号String[] array = response.split("\\|");if (array != null && array.length == 2) {String weatherCode = array[1];queryWeatherInfo(weatherCode);}}} else if ("weatherCode".equals(type)) {// 处理服务器返回的天气信息Utility.handleWeatherResponse(WeatherActivity.this, response);runOnUiThread(new Runnable() {@Overridepublic void run() {showWeather();}});}}@Overridepublic void onError(Exception e) {runOnUiThread(new Runnable() {@Overridepublic void run() {publishText.setText("同步失败");}});}});}/** * 从SharedPreferences文件中读取存储的天气信息，并显示到界面上。 */private void showWeather() {SharedPreferences prefs = PreferenceManager. getDefaultSharedPreferences(this);cityNameText.setText( prefs.getString("city_name", ""));temp1Text.setText(prefs.getString("temp1", ""));temp2Text.setText(prefs.getString("temp2", ""));weatherDespText.setText(prefs.getString("weather_desp", ""));publishText.setText("今天" + prefs.getString("publish_time", "") + "发布");currentDateText.setText(prefs.getString("current_date", ""));weatherInfoLayout.setVisibility(View.VISIBLE);cityNameText.setVisibility(View.VISIBLE);Intent intent = new Intent(this, AutoUpdateService.class);startService(intent);}}
ChooseAreaActivity.java
public class ChooseAreaActivity extends Activity {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 ListView listView;private ArrayAdapter<String> adapter;private CoolWeatherDB coolWeatherDB;private List<String> dataList = new ArrayList<String>();/** * 省列表 */private List<Province> provinceList;/** * 市列表 */private List<City> cityList;/** * 县列表 */private List<County> countyList;/** * 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;/** * 是否从WeatherActivity中跳转过来。 */private boolean isFromWeatherActivity;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);isFromWeatherActivity = getIntent().getBooleanExtra("from_weather_ activity", false);SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);// 已经选择了城市且不是从WeatherActivity跳转过来，才会直接跳转到WeatherActivityif (prefs.getBoolean("city_selected", false) && !isFromWeatherActivity) {Intent intent = new Intent(this, WeatherActivity.class);startActivity(intent);finish();return;}requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.choose_area);listView = (ListView) findViewById(R.id.list_view);titleText = (TextView) findViewById(R.id.title_text);adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, dataList);listView.setAdapter(adapter);coolWeatherDB = CoolWeatherDB.getInstance(this);listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View view, 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) {String countyCode = countyList.get(index).getCountyCode();Intent intent = new Intent(ChooseAreaActivity.this,WeatherActivity.class);intent.putExtra("county_code", countyCode);startActivity(intent);finish();}}});queryProvinces(); // 加载省级数据}/** * 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() {provinceList = coolWeatherDB.loadProvinces();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;} else {queryFromServer(null, "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() {cityList = coolWeatherDB.loadCities(selectedProvince.getId());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;} else {queryFromServer(selectedProvince.getProvinceCode(), "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() {countyList = coolWeatherDB.loadCounties(selectedCity.getId());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;} else {queryFromServer(selectedCity.getCityCode(), "county");}}/** * 根据传入的代号和类型从服务器上查询省市县数据。 */private void queryFromServer(final String code, final String type) {String address;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";}showProgressDialog();HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {@Overridepublic void onFinish(String response) {boolean result = false;if ("province".equals(type)) {result = Utility.handleProvincesResponse(coolWeatherDB,response);} else if ("city".equals(type)) {result = Utility.handleCitiesResponse(coolWeatherDB,response, selectedProvince.getId());} else if ("county".equals(type)) {result = Utility.handleCountiesResponse(coolWeatherDB,response, selectedCity.getId());}if (result) {// 通过runOnUiThread()方法回到主线程处理逻辑runOnUiThread(new Runnable() {@Overridepublic void run() {closeProgressDialog();if ("province".equals(type)) {queryProvinces();} else if ("city".equals(type)) {queryCities();} else if ("county".equals(type)) {queryCounties();}}});}}@Overridepublic void onError(Exception e) {// 通过runOnUiThread()方法回到主线程处理逻辑runOnUiThread(new Runnable() {@Overridepublic void run() {closeProgressDialog();Toast.makeText(ChooseAreaActivity.this, "加载失败",Toast.LENGTH_SHORT).show();}});}});}/** * 显示进度对话框 */private void showProgressDialog() {if (progressDialog == null) {progressDialog = new ProgressDialog(this);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();}}/** * 捕获Back按键，根据当前的级别来判断，此时应该返回市列表、省列表、还是直接退出。 */@Overridepublic 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();}}}
weather_layout.java
<?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:orientation="vertical" >    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="50dp"        android:background="#484E61" >          <Button            android:id="@+id/switch_city"            android:layout_width="30dp"            android:layout_height="30dp"            android:layout_centerVertical="true"            android:layout_marginLeft="10dp"            android:background="@drawable/home" />        <TextView            android:id="@+id/city_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:textColor="#fff"            android:textSize="24sp" />         <Button            android:id="@+id/refresh_weather"            android:layout_width="30dp"            android:layout_height="30dp"            android:layout_alignParentRight="true"            android:layout_centerVertical="true"            android:layout_marginRight="10dp"            android:background="@drawable/refresh" />    </RelativeLayout>    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:background="#27A5F9" >        <TextView            android:id="@+id/publish_text"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:layout_marginRight="10dp"            android:layout_marginTop="10dp"            android:textColor="#FFF"            android:textSize="18sp" />        <LinearLayout            android:id="@+id/weather_info_layout"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:orientation="vertical" >            <TextView                android:id="@+id/current_date"                android:layout_width="wrap_content"                android:layout_height="40dp"                android:gravity="center"                android:textColor="#FFF"                android:textSize="18sp" />            <TextView                android:id="@+id/weather_desp"                android:layout_width="wrap_content"                android:layout_height="60dp"                android:layout_gravity="center_horizontal"                android:gravity="center"                android:textColor="#FFF"                android:textSize="40sp" />            <LinearLayout                android:layout_width="wrap_content"                android:layout_height="60dp"                android:layout_gravity="center_horizontal"                android:orientation="horizontal" >                <TextView                    android:id="@+id/temp1"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center_vertical"                    android:textColor="#FFF"                    android:textSize="40sp" />                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center_vertical"                    android:layout_marginLeft="10dp"                    android:layout_marginRight="10dp"                    android:text="~"                    android:textColor="#FFF"                    android:textSize="40sp" />                <TextView                    android:id="@+id/temp2"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center_vertical"                    android:textColor="#FFF"                    android:textSize="40sp" />            </LinearLayout>        </LinearLayout>    </RelativeLayout></LinearLayout>
 

                                             
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