J2ME显示google天气预报

这个小程序写了好久了，但是前一阵一直因为三星手机无法显示图片的问题无法解决。现在那个问题解决了，不是三星的问题，是要过滤移动资费页面。这个程序也能贴出来了。



通过高级UI编写，要用到kxml2来解析google服务器的返回值。显示部分是Form和CustomItem.只显示日期，未来几天的气温以及表示天气状况的图片，其他很多信息没有显示，但是在所有获取的信息都已解析出来并在控制台打印，需要的话可以直接拿来再屏幕上显示。我在url里面吧城市设定为上海，可以直接改。

程序如下：

package googleweather;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.CustomItem;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import org.kxml2.io.KXmlParser;
import org.xmlpull.v1.XmlPullParserException;

public class GoogleWeather extends MIDlet {
	InputStream is;
	Display dis;
	Form f;
	int width ;
	String city ;
	String forecast_date;
	public GoogleWeather() {
		dis = Display.getDisplay(this);
		
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	protected void startApp() throws MIDletStateChangeException {
		f = new Form("天气预报");
		width = f.getWidth();
		dis.setCurrent(f);
		getIS() ;
		if (is == null) f.append("is == null");
		parse();
	}

	public boolean getIS() {
		String url = "http://www.google.com/ig/api?weather=Shanghai";
		HttpConnection hcon = null;
		boolean ret = false;
		try {
			hcon = (HttpConnection) Connector.open(url);
			String contentType = hcon.getHeaderField("Content-Type"); // 这里用来过滤移动资费页面
			if (contentType != null
					&& contentType.indexOf("text/vnd.wap.wml") != -1) {
				hcon = null;
				hcon = (HttpConnection) Connector.open(url);
			}
			is = new DataInputStream(hcon.openInputStream());
			ret = true;
		} catch (Exception e) {
			ret = false;
			e.printStackTrace();
		}
		return ret;
	}

	public boolean parse() {
		KXmlParser parser;
		parser = new KXmlParser();
		boolean ret = false;
		try {
			parser.setInput(new InputStreamReader(is));
			xml_api_reply(parser);

		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			is.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return ret;
	}

	private void xml_api_reply(KXmlParser parser) {
		try {
			
			parser.nextTag();
			parser.require(KXmlParser.START_TAG, null, "xml_api_reply");
			parser.nextTag();
			parser.require(KXmlParser.START_TAG, null, "weather");
			parser.nextTag();
			forecast_information(parser);
			parser.nextTag();
			current_conditions(parser);
			parser.nextTag();
			forecast_conditions(parser);
			parser.nextTag();
			forecast_conditions(parser);
			parser.nextTag();
			forecast_conditions(parser);
			parser.nextTag();
			forecast_conditions(parser);
			parser.nextTag();
			parser.require(KXmlParser.END_TAG, null, "weather");
			parser.nextTag();
			parser.require(KXmlParser.END_TAG, null, "xml_api_reply");
		} catch (XmlPullParserException e) {
			f.append("11");
		} catch (IOException e) {
			f.append("12");
		}
	}

	private void current_conditions(KXmlParser parser) throws XmlPullParserException, IOException {

		String condition,temp_f,temp_c ,humidity ,icon,wind_condition ;
		parser.require(KXmlParser.START_TAG, null, "current_conditions");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "condition");
		condition = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "condition");
		
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "temp_f");
		temp_f = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "temp_f");
		
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "temp_c");
		temp_c = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "temp_c");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "humidity");
		humidity = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "humidity");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "icon");
		icon = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "icon");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "wind_condition");
		wind_condition = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "wind_condition");
		parser.nextTag();

		System.out.println(condition);
		System.out.println(temp_f);
		System.out.println(temp_c);
		System.out.println(humidity);
		System.out.println(icon);
		System.out.println(wind_condition);
		
		icon = "http://www.google.com" + icon ;

		CurrentWeatherItem cwi = new CurrentWeatherItem(temp_c ,  city , forecast_date, loadHttpFile(icon));
		f.append(cwi);
		parser.require(KXmlParser.END_TAG, null, "current_conditions");
		
	}

	private Image loadHttpFile(String url) throws IOException {

		System.out.println(url);
		byte[] byteBuffer = null;		
		HttpConnection hc = (HttpConnection) Connector.open(url);
		String contentType = hc.getHeaderField("Content-Type"); // 这里用来过滤移动资费页面
		if (contentType != null
				&& contentType.indexOf("text/vnd.wap.wml") != -1) {
			hc = null;
			hc = (HttpConnection) Connector.open(url);
		}
		int code = hc.getResponseCode();
		if (code == 200) {
			try {
				InputStream is = hc.openInputStream();
				try {
					int len = (int) hc.getLength();
					if (len > 0) {
						byteBuffer = new byte[len];
						int done = 0;
						while (done < len) {
							done += is.read(byteBuffer, done, len - done);
						}
					} else {
						ByteArrayOutputStream bos = new ByteArrayOutputStream();
						byte[] buffer = new byte[512];
						int count;
						while ((count = is.read(buffer)) >= 0) {
							bos.write(buffer, 0, count);
						}
						byteBuffer = bos.toByteArray();
					}
				} finally {
					is.close();
				}
			} finally {
				hc.close();
			}
		}
		return Image.createImage(byteBuffer, 0, byteBuffer.length);	
		
	}

	private void forecast_information(KXmlParser parser) throws XmlPullParserException, IOException {
		String city,postal_code,latitude_e6,longitude_e6,forecast_date,current_date_time,unit_system;
		parser.require(KXmlParser.START_TAG, null, "forecast_information");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "city");
		city = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "city");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "postal_code");
		postal_code = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "postal_code");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "latitude_e6");
		latitude_e6 = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "latitude_e6");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "longitude_e6");
		longitude_e6 = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "longitude_e6");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "forecast_date");
		forecast_date = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "forecast_date");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "current_date_time");
		current_date_time = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "current_date_time");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "unit_system");
		unit_system = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "unit_system");
		parser.nextTag();
		
		System.out.println(city);
		System.out.println(postal_code);
		System.out.println(latitude_e6);
		System.out.println(longitude_e6);
		System.out.println(forecast_date);
		System.out.println(current_date_time);
		System.out.println(unit_system);

		this.city = city ;
		this.forecast_date = forecast_date ;
		parser.require(KXmlParser.END_TAG, null, "forecast_information");

	}

	private void forecast_conditions(KXmlParser parser) throws XmlPullParserException, IOException {

		String day_of_week,low,high,icon ,condition ;
		parser.require(KXmlParser.START_TAG, null, "forecast_conditions");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "day_of_week");
		day_of_week = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "day_of_week");
		
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "low");
		low = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "low");
		
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "high");
		high = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "high");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "icon");
		icon = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "icon");
		parser.nextTag();
		parser.require(KXmlParser.START_TAG, null, "condition");
		condition = parser.getAttributeValue(0); 
		parser.nextTag();
		parser.require(KXmlParser.END_TAG, null, "condition");
		parser.nextTag();

		System.out.println(day_of_week);
		System.out.println(low);
		System.out.println(high);
		System.out.println(icon);
		System.out.println(condition);
		icon = "http://www.google.com" + icon ;

		if(day_of_week.equalsIgnoreCase("mon")) day_of_week = "周一" ;
		else if(day_of_week.equalsIgnoreCase("tue")) day_of_week = "周二";
		else if(day_of_week.equalsIgnoreCase("wed")) day_of_week = "周三";
		else if(day_of_week.equalsIgnoreCase("thu")) day_of_week = "周四";
		else if(day_of_week.equalsIgnoreCase("fri")) day_of_week = "周五";
		else if(day_of_week.equalsIgnoreCase("sat")) day_of_week = "周六";
		else day_of_week = "周日";
		low = String.valueOf((Integer.parseInt(low) - 32) * 5 / 9);
		high = String.valueOf((Integer.parseInt(high) - 32) * 5 / 9);

		ForecastWeatherItem fwi = new ForecastWeatherItem(day_of_week, low ,  high , loadHttpFile(icon));
		f.append(fwi);
		parser.require(KXmlParser.END_TAG, null, "forecast_conditions");
	}

	public class CurrentWeatherItem extends CustomItem{

		String temp ;
		String city ;
		String forecast_date;
		Image icon;
		protected CurrentWeatherItem(String temp , String city ,String forecast_date,Image icon ) {
			super(forecast_date);
			this.temp = temp ;
			this.city = city;
			this.forecast_date = forecast_date;
			this.icon = icon;
		}

		protected int getMinContentHeight() {
			// TODO Auto-generated method stub
			return 40;
		}

		protected int getMinContentWidth() {
			// TODO Auto-generated method stub
			return width;
		}

		protected int getPrefContentHeight(int arg0) {
			// TODO Auto-generated method stub
			return 40;
		}

		protected int getPrefContentWidth(int arg0) {
			// TODO Auto-generated method stub
			return width;
		}

		protected void paint(Graphics g, int arg1, int arg2) {
    		g.setColor(0x9accff);
        	g.fillRect(0, 0, width, 40);
            g.drawImage(this.icon, 20, 20, Graphics.HCENTER | Graphics.VCENTER);
    		g.setColor(0x000000);
            g.drawString("当前气温：" , 50, 10, 0);			
            g.drawString(temp + "℃" , 100, 10, 0);
		}
	}

	public class ForecastWeatherItem extends CustomItem{

		String day_of_week;
		String low;
		String high ;
		Image icon;
		protected ForecastWeatherItem(String day_of_week, String low, String high , Image icon) {
			super(null);
			this.day_of_week = day_of_week;
			this.low = low;
			this.high = high ;
			this.icon = icon ;
		}

		protected int getMinContentHeight() {
			// TODO Auto-generated method stub
			return 40;
		}

		protected int getMinContentWidth() {
			// TODO Auto-generated method stub
			return width;
		}

		protected int getPrefContentHeight(int arg0) {
			// TODO Auto-generated method stub
			return 40;
		}

		protected int getPrefContentWidth(int arg0) {
			// TODO Auto-generated method stub
			return width;
		}

		protected void paint(Graphics g, int arg1, int arg2) {
    		g.setColor(0x66cbff);
        	g.fillRect(0, 0, width, 40);
            g.drawImage(this.icon, 20, 20, Graphics.HCENTER | Graphics.VCENTER);
    		g.setColor(0x000000);
            g.drawString(day_of_week , 50, 10, 0);
            g.drawString(low + "℃ /" + high + "℃", 100, 10, 0);
		}
	}
}