1，使用Googel API
http://www.google.com/ig/api?&weather=beijing
2，使用DOM解析XML
String weather = ""
;String url = "[url=http://www.google.com/ig/api?&weather=beijing]http://www.google.com/ig/api?&weather=beijing[/url]"
; DefaultHttpClient client =
new
DefaultHttpClient();HttpUriRequest req =
new
HttpGet(url);HttpResponse resp =
client.execute(req);HttpEntity ent =
resp.getEntity(); InputStream stream =
ent.getContent();DocumentBuilder b =
DocumentBuilderFactory.newInstance().newDocumentBuilder();Document d = b.parse(
new
InputSource(stream)); NodeList n = d.getElementsByTagName("forecast_conditions"
);
for (
int i = 0; i < n.getLength(); i++
) { weather += n.item(i).getChildNodes().item(0).getAttributes().item(0
).getNodeValue();weather += ", "
;weather += (Integer.parseInt(n.item(i).getChildNodes().item(1).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9
; weather += " ~ "
;weather += (Integer.parseInt(n.item(i).getChildNodes().item(2).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9
;weather += ", "
; weather += n.item(i).getChildNodes().item(4).getAttributes().item(0
).getNodeValue(); weather += "\n"
;}
3，另起Thread处理Web请求
new
Thread() {
public
void
run() {
try
{
//
... }
catch
(Exception e) { e.printStackTrace(); } } }.start();
4，使用Handler传递Thread处理结果到UI主Thread
h =
new
Handler() {
public
void
handleMessage(Message msg) { tv.setText((String)msg.obj);}};
new
Thread() {
//
...Message msg = h.obtainMessage(1, 1, 1
, weather);h.sendMessage(msg);}
5，完整代码
package
com.hideto.weatherforecast;
import
java.io.InputStream;
import
javax.xml.parsers.DocumentBuilder;
import
javax.xml.parsers.DocumentBuilderFactory;
import
org.apache.http.HttpEntity;
import
org.apache.http.HttpResponse;
import
org.apache.http.client.methods.HttpGet;
import
org.apache.http.client.methods.HttpUriRequest;
import
org.apache.http.impl.client.DefaultHttpClient;
import
org.w3c.dom.Document;
import
org.w3c.dom.NodeList;
import
org.xml.sax.InputSource;
import
android.app.Activity;
import
android.os.Bundle;
import
android.os.Handler;
import
android.os.Message;
import
android.widget.TextView;
public
class WeatherForecast
extends
Activity {
public
TextView tv;
public
Handler h; @Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState); tv =
new TextView(
this
); tv.setText("Loading..."
); setContentView(tv); h =
new
Handler() {
public
void
handleMessage(Message msg) { tv.setText((String)msg.obj); } };
new
Thread() {
public
void
run() {
try
{
String weather = "" ; String url = "[url=http://www.google.com/ig/api?&weather=beijing]http://www.google.com/ig/api?&weather=beijing[/url]" ; DefaultHttpClient client = new DefaultHttpClient(); HttpUriRequest req = new HttpGet(url); HttpResponse resp = client.execute(req); HttpEntity ent = resp.getEntity(); InputStream stream = ent.getContent(); DocumentBuilder b = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document d = b.parse( new InputSource(stream)); NodeList n = d.getElementsByTagName("forecast_conditions" );
for ( int i = 0; i < n.getLength(); i++ ) { weather += n.item(i).getChildNodes().item(0 ).getAttributes().item(0 ).getNodeValue();
weather += ", " ; weather += (Integer.parseInt(n.item(i).getChildNodes().item(1).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9 ; weather += " ~ " ;
weather += (Integer.parseInt(n.item(i).getChildNodes().item(2).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9 ; weather += ", " ; weather += n.item(i).getChildNodes().item(4 ).getAttributes().item(0 ).getNodeValue(); weather += "\n" ; } Message msg = h.obtainMessage(1, 1, 1 , weather); h.sendMessage(msg); } catch (Exception e) { e.printStackTrace(); } } }.start();} }
String weather = "" ; String url = "[url=http://www.google.com/ig/api?&weather=beijing]http://www.google.com/ig/api?&weather=beijing[/url]" ; DefaultHttpClient client = new DefaultHttpClient(); HttpUriRequest req = new HttpGet(url); HttpResponse resp = client.execute(req); HttpEntity ent = resp.getEntity(); InputStream stream = ent.getContent(); DocumentBuilder b = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document d = b.parse( new InputSource(stream)); NodeList n = d.getElementsByTagName("forecast_conditions" );
for ( int i = 0; i < n.getLength(); i++ ) { weather += n.item(i).getChildNodes().item(0 ).getAttributes().item(0 ).getNodeValue();
weather += ", " ; weather += (Integer.parseInt(n.item(i).getChildNodes().item(1).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9 ; weather += " ~ " ;
weather += (Integer.parseInt(n.item(i).getChildNodes().item(2).getAttributes().item(0).getNodeValue()) - 32) * 5 / 9 ; weather += ", " ; weather += n.item(i).getChildNodes().item(4 ).getAttributes().item(0 ).getNodeValue(); weather += "\n" ; } Message msg = h.obtainMessage(1, 1, 1 , weather); h.sendMessage(msg); } catch (Exception e) { e.printStackTrace(); } } }.start();} }
6，修改AndroidManifest.xml加上INTERNET访问权限
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="[url=http://schemas.android.com/apk/res/android]http://schemas.android.com/apk/res/android[/url]"
package="com.hideto.weatherforecast"
android:versionCode="1"
android:versionName="1.0.0"> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".WeatherForecast"
android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
原文链接：http://www.cnblogs.com/vus520/archive/2012/06/03/2561987.html
