Android项目 之 天气预报(附源码)
编程环境：Eclipse3.5.2 + Android 2.3.3 + Linux 3.0.0 (Ubuntu 11.10)
架构图：
publicstaticfinalStringqueryString= "http://www.google.com/ig/api?hl=zh-cn&weather=";
考虑到网络的延迟和用户的体验，从服务器上读取信息的代码在线程中进行和用Handler处理消息：
publicvoidrun() {
mHandler.sendEmptyMessage(RUNNABLESTART);
String cityParamString = ConstData.cityCode[this.city_index];
try{
URL url =newURL(ConstData.queryString+ cityParamString);
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
GoogleWeatherHandler gwh =newGoogleWeatherHandler();
xr.setContentHandler(gwh);
InputStreamReader isr =newInputStreamReader(url.openStream(),
"GBK");
InputSource is =newInputSource(isr);
xr.parse(is);
my_ws = gwh.getMyWeatherSet();
mHandler.sendEmptyMessage(SHOWINFORMATION);
}catch(UnknownHostException e){
mHandler.sendEmptyMessage(LOSTHOST);
}catch(Exception e) {
e.printStackTrace();
}
}
Handler mHandler =newHandler() {
@Override
publicvoidhandleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what) {
caseLOSTHOST:
pd.dismiss();
Toast.makeText(MainActivity.this, "无法连接服务器，请检查您的网络", Toast.LENGTH_LONG).show();
break;
caseSHOWINFORMATION:
try{
if(my_ws.getMyCurrentCondition()!=null){
updateCurrWeather(my_ws.getMyCurrentCondition());
updateInformation(my_ws.getInformation());
updateWeatherInfoView(R.id.weather_1, my_ws.getMyForecastConditions().get(0));
updateWeatherInfoView(R.id.weather_2, my_ws.getMyForecastConditions().get(1));
updateWeatherInfoView(R.id.weather_3, my_ws.getMyForecastConditions().get(2));
updateWeatherInfoView(R.id.weather_4, my_ws.getMyForecastConditions()get(3));
}else{
Toast.makeText(MainActivity.this, "没有该城市信息！", Toast.LENGTH_LONG).show();
}
}catch(Exception e) {
e.printStackTrace();
}
pd.dismiss();
mThread.stop();//非线程安全，但在这次APP中，不会有什么问题。
break;
caseRUNNABLESTART:
pd = ProgressDialog.show(MainActivity.this, "请稍等", "正在加载信息...",true);
break;
}
}
主界面有两个按钮，对应两个功能，非别是 选择城市 和 我的城市。
1)选择城市
弹出一个框，可以自己搜索想要的城市。为方便输入，输入框使用了AutoCompleteTextView。(虚拟机不支持中文，所以这里使用了城市名的全拼)
@Override
protectedDialog onCreateDialog(intid) {
LayoutInflater dialoglayout = LayoutInflater.from(this);
finalView textEntryView = dialoglayout.inflate(R.layout.dialog,null);
ArrayAdapter<String> adapter =newArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, ConstData.cityCode);
/*findByView方法时 要注意布局关系*/
finalAutoCompleteTextView autoCompleteTextView = (AutoCompleteTextView) textEntryView.findViewById(R.id.search);
autoCompleteTextView.setAdapter(adapter);
returnnewAlertDialog.Builder(this)
.setView(textEntryView)
.setIcon(R.drawable.search)
.setTitle("请输入城市")
.setPositiveButton(R.string.set_to_mycity,newDialogInterface.OnClickListener() {
publicvoidonClick(DialogInterface dialog,intwhichButton) {
city_index = convertCity_nameToCity_code(autoCompleteTextView.getText().toString());
SharedPreferences.Editor editor = sharedPreferences.edit();
String key = "MyCitys"+city_index;
if(!sharedPreferences.contains(key)){
try{
editor.putString(key, ConstData.city[city_index]);
editor.commit();
}catch(ArrayIndexOutOfBoundsException e){
Toast.makeText(MainActivity.this, "城市名有誤!",Toast.LENGTH_LONG).show();
}
}
mThread.run();
}
})
.setNegativeButton(R.string.start_search,newDialogInterface.OnClickListener() {
publicvoidonClick(DialogInterface dialog,intwhichButton) {
city_index = convertCity_nameToCity_code(autoCompleteTextView.getText().toString());
Log.i("tag","autoCompleteTextView.getListSelection() = "+city_index);
if( city_index >= 0 ) mThread.run() ;
elseToast.makeText(MainActivity.this, "获取城市信息失败", Toast.LENGTH_LONG);
}
})
.create();
}
2)我的城市
可以将自己所在的城市或者关注的城市添加到此，方便日后的查询。这里用了ListView控件显示数据，数据存储在SharedPreferences中。
list =newArrayList<String>();
lv =newListView(this);
sharedPreferences = getSharedPreferences(PREFERENCE_NAME,MODE);
editor = sharedPreferences.edit();
init();
lv.setOnItemClickListener(newOnItemClickListener(){ //单击监听事件
publicvoidonItemClick(AdapterView<?> arg0, View arg1,intpos,
longarg3) {
Intent intent =newIntent(ListOfMyCity.this, MainActivity.class);
String name = list.get(pos);
inti ;
for(i=0; i < ConstData.city.length; i++){
if(name.equals(ConstData.city[i])){
editor.putInt("DefaultCity", i);
editor.commit();
break;
}
}
intent.putExtra("city_code", i);
setResult(8, intent);
finish();
}});
lv.setOnItemLongClickListener(newOnItemLongClickListener(){//长按事件 触发“删除”和“设为默认城市” 事件
publicbooleanonItemLongClick(AdapterView<?> arg0, View arg1,
intpos,longarg3) {
showDialog(pos);
returnfalse;
}});
删除可以将城市从 数据中删除，设为默认城市后，每次启动APP都会自动检索到该城市。
主界面：
代码：http://download.csdn.net/detail/cliffbaby/4003285