google天气预报SAX解析版（只有当天的天气）-优快云博客

本文介绍了一个简单的Android天气应用实现过程，包括如何通过网络获取天气数据、解析XML数据、显示天气图标及文字信息等内容。

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废话不多说，直接上代码，代码里面注释很详细，不过之前一定要使用权限，

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />这两个权限不是必须的，但是为了以防万一，我一般都写上。

<uses-permission android:name="android.permission.INTERNET" />一定要写上，只要需要联网，都需要写上他，我的博客里面有一份权限大全，有兴趣的可以看看，

android上的权限很严格，使用特定功能必须使用特定的权限。其实，要是都写上不知道是什么结果，我也没有试过。哈哈哈

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="mars.com"
    android:versionCode="1"
    android:versionName="1.0" >

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

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".Weather2Activity"
            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>

java文件如下

Activity文件

package mars.com;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class Weather2Activity extends Activity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button submit = (Button) findViewById(R.id.submit);
		submit.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				try {
					String querystr = "http://www.google.com/ig/api?weather=,,,39905780,116386890";
					URL aURL = new URL(querystr.replace(" ", "%20"));
					// 从SAXParserFactory中获取SAXParser
					Log.v("querystr", querystr);
					Log.v("querystr", querystr.replace(" ", "%20"));
					// 创建一个SAXParserFactory对象
					SAXParserFactory spf = SAXParserFactory.newInstance();
					// 利用SAXParserFactory对象spf的newSAXParser()方法生成一个SAXParser对象
					SAXParser sp = spf.newSAXParser();
					XMLReader xr = sp.getXMLReader();// 从SAXParser中得到XMLReader
					// 创建一个解析xml文件的GoogleWeatherHandler对象gwh
					GoogleWeatherHandler gwh = new GoogleWeatherHandler();
					// 设定XMLReader类的xml处理对象 */
					xr.setContentHandler(gwh);
					// 解析XML文件内容 */
					xr.parse(new InputSource(aURL.openStream()));
					// 下面进行图片的请求 并生成一幅bmp图像 */
					URL iconurl = new URL("http://www.google.com"
							+ gwh.getIconURL());
					URLConnection conn = iconurl.openConnection();
					conn.connect();
					// 获得图像的字符流
					InputStream is = conn.getInputStream();
					BufferedInputStream bis = new BufferedInputStream(is, 8192);
					ImageView iv = (ImageView) findViewById(R.id.iconofwheather);
					Bitmap bm = null;// 生成了一张bmp图像
					bm = BitmapFactory.decodeStream(bis);
					bis.close();
					is.close();// 关闭流
					System.out.println(bm.getHeight());
					iv.setImageBitmap(bm);
					TextView tv1 = (TextView) findViewById(R.id.condition);
					tv1.append(gwh.getCurrent_condition());
					TextView tv2 = (TextView) findViewById(R.id.temperature);
					tv2.append(gwh.getCurrent_temp().toString() + "摄氏度");
					TextView tv3 = (TextView) findViewById(R.id.humidity);
					tv3.append(gwh.getCurrent_hum().replace("Humidity", ""));
					System.out.println(tv1.getText().toString());
					System.out.println(tv2.getText().toString());
					System.out.println(tv3.getText().toString());
				} catch (Exception e) {
					Log.e("error", e.toString());
				}
			}
		});
	}
}

工具类java文件如下

package mars.com;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class GoogleWeatherHandler extends DefaultHandler {
	private boolean in_forecast_information = false;
	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;
	private boolean usingSITemperature = false; // false为华氏度，true为摄氏度

	public Integer getCurrent_temp() {
		return current_temp;
	}

	public void setCurrent_temp(Integer currentTemp) {
		current_temp = currentTemp;
	}

	public String getCurrent_condition() {
		return current_condition;
	}

	public void setCurrent_condition(String currentCondition) {
		current_condition = currentCondition;
	}

	public String getCurrent_hum() {
		return current_hum;
	}

	public void setCurrent_hum(String currentHum) {
		current_hum = currentHum;
	}

	public String getIconURL() {
		return iconURL;
	}

	public void setIconURL(String iconURL) {
		this.iconURL = iconURL;
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
	}

	@Override
	public void endDocument() throws SAXException {
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		// TODO Auto-generated method stub
		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 startDocument() throws SAXException {
	}

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		// TODO Auto-generated method stub
		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 = attributes.getValue("data");
			if (localName.equals("city")) {
			} else if (localName.equals("postal_code")) {
			} else if (localName.equals("latitude_e6")) {
			} else if (localName.equals("longitude_e6")) {
			} 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;
			} 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.setCurrent_condition(dataAttribute);
				} else if (this.in_forecast_conditions) {
					// 可扩展
				}
			} else if (localName.equals("temp_f")) {
			} else if (localName.equals("temp_c")) {
				this.setCurrent_temp(Integer.parseInt(dataAttribute));
			} else if (localName.equals("humidity")) {
				this.setCurrent_hum(dataAttribute);
			} else if (localName.equals("wind_condition")) {
				// 可扩展
			} 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
				}
			}
		}
	}
}

main.xml文件如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/submit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="点击" />

    <ImageView
        android:id="@+id/iconofwheather"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/condition"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/temperature"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/humidity"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>

以上是全部的代码，有啥不明白的，我们可以探讨一下。我们互相学习，共同进步。过两天会把xmlPull解析，DOM解析等其他三种解析方式贴出来。