简单应用：通过经纬度获取Google天气数据

1、首先，在AndroidManifest.xml文件中添加权限，允许android访问internet，如下：

<uses-permission android:name="android.permission.INTERNET"/>

2、其次，通过经纬度获取Google天气的API是（其中30670000,104019996分别表示经度和纬度）：

http://www.google.com/ig/api?hl=zh-cn&weather=,,,30670000,104019996

通过此API，将返回一个XML的文件，里面包含了Google提供的天气信息。

3、通过NodeList，获取相关节点的数据。

4、具体代码如下：

public class GoogleWeather {
private Integer Latitude;//纬度
private Integer Longitude;//经度
private String url=null;
private String sTemp;//温度

GoogleWeather(Integer longi,Integer lati)
{
Latitude=lati;
Longitude=longi;

//http://www.google.com/ig/api?hl=zh-cn&weather=,,,30670000,104019996
url="http://www.google.com/ig/api?hl=en&weather=,,,"+Longitude+","+Latitude;
Log.d("log","url="+url);
}

public void getWeatherData() throws ClientProtocolException, IOException, ParserConfigurationException, FactoryConfigurationError, SAXException
{
DefaultHttpClient client = new DefaultHttpClient();
HttpUriRequest Request = new HttpGet(url);
HttpResponse Response = client.execute(Request);
HttpEntity Entity = Response.getEntity();
InputStream stream = Entity.getContent();
DocumentBuilder Builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = Builder.parse(new InputSource(stream));
NodeList n = doc.getElementsByTagName("current_conditions");

Log.d("log","Node Length="+n.getLength());
for (int i = 0; i < n.getLength(); i++)//遍列current_condition所有节点
{
//获取节点的天气数据
sTemp=n.item(i).getChildNodes().item(2).getAttributes().item(0).getNodeValue();
}
Log.d("log","sTemp="+sTemp);
}
}