1,使用Googel API
http://www.google.com/ig/api?&weather=beijing
2,使用DOM解析XML
- String weather = "";
- String url = "http://www.google.com/ig/api?&weather=beijing";
- 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";
- }
String weather = "";
String url = "http://www.google.com/ig/api?&weather=beijing";
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處理Web請求
- new Thread() {
- public void run() {
- try {
- // ...
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }.start();
new Thread() {
public void run() {
try {
// ...
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
4,使用Handler傳遞Thread處理結果到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);
- }
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,完整代碼
- 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 = "http://www.google.com/ig/api?&weather=beijing";
- 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();
- }
- }
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 = "http://www.google.com/ig/api?&weather=beijing";
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訪問權限
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- 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>