Android开发之Google天气显示（综合例子）
Android的google天气显示，包括读取网络信息，读取xml，使用网络信息二级制码生成文件
1.生成url
2.获取google返回的网络信息 new InputSource(aURL.openStream())
3.生成解析xml的处理器
4.解析xml
5.封装解析后的xml文件
6.根据解析后的数据，生成url，获取google返回的天气图标，赋值给图片
代码：
/*获取用户输入的城市名称*/
String city = ((EditText) findViewById(R.id.input))
.getText().toString();
/*组成URL字符串*/
//中文：http://www.google.com/ig/api?hl=zh-cn&weather=
//英文：http://www.google.com/ig/api?weather=
String queryString = "http://www.google.com/ig/api?weather="
+ city;
/*将可能的空格替换为"%20"*/
URL aURL = new URL(queryString.replace(" ", "%20"));
/* 从SAXParserFactory获取SAXParser*/
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
/* 从SAXParser得到XMLReader*/
XMLReader xr = sp.getXMLReader();
/*
* 创建GoogleWeatherHandler，以便解析XML内容
*/
GoogleWeatherHandler gwh = new GoogleWeatherHandler();
xr.setContentHandler(gwh);
/* 解析XML文件内容 */
xr.parse(new InputSource(aURL.openStream()) );
TextView tv1 = (TextView)findViewById(R.id.tem);
tv1.setText("温度：" + gwh.getCurrentTemp() + "摄氏度");
TextView tv2 = (TextView)findViewById(R.id.weather);
tv2.setText(gwh.getCurrentCondition());
TextView tv3 = (TextView)findViewById(R.id.hum);
tv3.setText(""+ gwh.getCurrentHum() );
URL iconURL = new URL("http://www.google.com"+ gwh.getIconURL());
URLConnection conn = iconURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
//设置icon
ImageView iv = (ImageView)findViewById(R.id.iconOfWeather);
Bitmap bm = null;
bm = BitmapFactory.decodeStream(bis);
iv.setImageBitmap(bm);
bis.close();
is.close();
分析google返回的xml的处理类代码：
private boolean in_current_conditions = false;
private boolean in_forecast_conditions = false;
private Integer current_temp;
private String current_condition;
private String current_hum;
private String iconURL;
@Override
public void startDocument() throws SAXException {
}
@Override
public void endDocument() throws SAXException {
}
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException {
// 'Outer' Tags
if (localName.equals("forecast_information")) {
this.in_forecast_information = true;
} else if (localName.equals("current_conditions")) {
this.in_current_conditions = true;
} else if (localName.equals("forecast_conditions")) {
this.in_forecast_conditions = true;
} else {
String dataAttribute = atts.getValue("data");
// 'Inner' Tags of "<forecast_information>"
if (localName.equals("city")) {
} else if (localName.equals("postal_code")) {
} else if (localName.equals("latitude_e6")) {
/* One could use this to convert city-name to Lat/Long. */
} else if (localName.equals("longitude_e6")) {
/* One could use this to convert city-name to Lat/Long. */
} else if (localName.equals("forecast_date")) {
} else if (localName.equals("current_date_time")) {
} else if (localName.equals("unit_system")) {
if (dataAttribute.equals("SI"))
this.usingSITemperature = true;
}
// SHARED(!) 'Inner' Tags within "<current_conditions>" AND
// "<forecast_conditions>"
else if (localName.equals("day_of_week")) {
if (this.in_current_conditions) {
//可扩展
} else if (this.in_forecast_conditions) {
//可扩展
}
} else if (localName.equals("icon")) {
if (this.in_current_conditions) {
this.setIconURL(dataAttribute);
} else if (this.in_forecast_conditions) {
//可扩展
}
} else if (localName.equals("condition")) {
if (this.in_current_conditions) {
this.setCurrentCondition(dataAttribute);
} else if (this.in_forecast_conditions) {
//可扩展
}
}
// 'Inner' Tags within "<current_conditions>"
else if (localName.equals("temp_f")) {
//this.setCurrentTemp(Integer.parseInt(dataAttribute));
} else if (localName.equals("temp_c")) {
this.setCurrentTemp(Integer.parseInt(dataAttribute));
} else if (localName.equals("humidity")) {
this.setCurrentHum(dataAttribute);
} else if (localName.equals("wind_condition")) {
//可扩展
}
// 'Inner' Tags within "<forecast_conditions>"
else if (localName.equals("low")) {
int temp = Integer.parseInt(dataAttribute);
if (this.usingSITemperature) {
//可扩展
} else {
//可扩展
}
} else if (localName.equals("high")) {
//int temp = Integer.parseInt(dataAttribute);
if (this.usingSITemperature) {
//可扩展
} else {
//可扩展
}
}
}
}
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
if (localName.equals("forecast_information")) {
this.in_forecast_information = false;
} else if (localName.equals("current_conditions")) {
this.in_current_conditions = false;
} else if (localName.equals("forecast_conditions")) {
this.in_forecast_conditions = false;
}
}
@Override
public void characters(char ch[], int start, int length) {
/*
* 可扩展 <element>characters</element>
*/
}