天气应用例子（适合初级编程者）

package com.weather.app; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.StringReader; import java.util.List; import java.util.Map; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import com.weather.comp.GPSListAdapter; import com.weather.comp.MyListAdapter; import com.weather.dao.DBHelper; import com.weather.utils.LocationXMLParser; import com.weather.utils.WeaterInfoParser; import com.weather.utils.WebAccessTools; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.appwidget.AppWidgetManager; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.database.sqlite.SQLiteDatabase; import android.location.Criteria; import android.location.Location; import android.location.LocationManager; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ListView; import android.widget.RemoteViews; import android.widget.TextView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ExpandableListView.OnChildClickListener; /** * * @author i-zqluo * 一个设置城市的Activity */ public class SetCityActivity extends Activity { //定义的一个自动定位的列表 private ListView gpsView; //定义的一个省份可伸缩性的列表 private ExpandableListView provinceList; //定义的用于过滤的文本输入框 private TextView filterText; //定义的一个记录城市码的SharedPreferences文件名 public static final String CITY_CODE_FILE="city_code"; //城市的编码 private String[][] cityCodes; //省份 private String[] groups; //对应的城市 private String[][] childs; //自定义的伸缩列表适配器 private MyListAdapter adapter; //记录应用程序widget的ID private int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.set_city); gpsView = (ListView)findViewById(R.id.gps_view); provinceList= (ExpandableListView)findViewById(R.id.provinceList); //设置自动定位的适配器 gpsView.setAdapter(new GPSListAdapter(SetCityActivity.this)); //==============================GPS================================= //当单击自动定位时 gpsView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { TextView localeCity = (TextView)view.findViewById(R.id.locateCityText); localeCity.setText("正在定位..."); final LocateHandler handler = new LocateHandler(localeCity); //添加一个线程来处理定位 new Thread(){ public void run() { Map<Integer, String> cityMap= getLocationCityInfo(); //记录匹配的城市的索引 int provinceIndex = -1; int cityIndex = -1; //传给处理类的数据封装对象 Bundle bundle = new Bundle(); if(cityMap!=null) { //得到图家名 String country = cityMap.get(LocationXMLParser.COUNTRYNAME); //只匹配中国地区的天气 if(country!=null&&country.equals("中国")){ //得到省 String province = cityMap.get(LocationXMLParser.ADMINISTRATIVEAREANAME); //得到市 String city = cityMap.get(LocationXMLParser.LOCALITYNAME); //得到区县 String towns = cityMap.get(LocationXMLParser.DEPENDENTLOCALITYNAME); Log.i("GPS", "============"+province+"."+city+"."+towns+"=============="); //将GPS定位的城市与提供能查天气的城市进行匹配 StringBuilder matchCity = new StringBuilder(city); matchCity.append("."); matchCity.append(towns); //找到省份 for(int i=0; i<groups.length; i++) { if(groups[i].equals(province)) { provinceIndex = i; break; } } //先从区县开始查找匹配的地区 for(int j=0; j<childs[provinceIndex].length; j++) { if(childs[provinceIndex][j].equals(matchCity.toString())) { cityIndex = j; break; } } //如果未匹配成功,则换为从城市中查找 if(cityIndex == -1) { for(int j=0; j<childs[provinceIndex].length; j++) { if(childs[provinceIndex][j].equals(city)) { cityIndex = j; //匹配成功，则退出循环 break; } } } } } //将其用bundle封装，用于传给Handler bundle.putInt("provinceIndex", provinceIndex); bundle.putInt("cityIndex", cityIndex); Message msg = new Message(); msg.setData(bundle); //正式交由handler处理 handler.sendMessage(msg); } }.start(); } }); //为过滤输入文本框添加事件 filterText = (TextView) findViewById(R.id.filterField); filterText.addTextChangedListener(new TextWatcher() { @Override public void afterTextChanged(Editable s) { CharSequence filterContent = filterText.getText(); //设置列表数据过滤结果显示 adapter.getFilter().filter(filterContent); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } }); //得到MainActivity或Widget传过来的intent Intent intent =getIntent(); //通过判断MainActivity传过来的isFirstRun来确定是否为第一次运行 boolean isFirstRun = intent.getBooleanExtra("isFirstRun", false); //通过接收Bundle来判断Widget中传递过来的WidgetId Bundle extras = intent.getExtras(); if (extras != null) { mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); //如果WidgetId有效 if(mAppWidgetId!=AppWidgetManager.INVALID_APPWIDGET_ID) { //判断它是否是第一次运行 SharedPreferences sp=getSharedPreferences(CITY_CODE_FILE, MODE_PRIVATE); if(sp.getString("code", null)==null) { //如果不存在城市码，则说明为第一次运行 isFirstRun = true; } else { //如存在则直接跳回 AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(SetCityActivity.this); RemoteViews views = new RemoteViews(SetCityActivity.this.getPackageName(), R.layout.widget_layout); //得到城市码 String cityCode= sp.getString("code", ""); if(cityCode!=null&&cityCode.trim().length() > 0) { Log.i("widget", "===================update weather==========================="); //更新widget WeatherWi