J2ME GPS定位JSR 179实例2

//为何在模拟器上OK,在手机上就不行呢?

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

import javax.microedition.lcdui.*;

import javax.microedition.location.*;

class MyCanvas extends Canvas

{

    GISMIDlet GIS;

    public MyCanvas(GISMIDlet GIS)

    {

        this.GIS = GIS;

    }

    private double lat;

    private double lon;

    public void setInfo(double lat, double lon)

    {

        this.lat = lat;

        this.lon = lon;

    }

    protected void paint(Graphics g)

    {

// TODO 自动产生方法 Stub

        Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN,

                Font.SIZE_SMALL);

        g.setFont(f);

// use font height as a line height

        int lineHeight = f.getHeight();

// current line counter

        int line = 0;

        g.setColor(0xffffff);

        g.fillRect(0, 0, getWidth(), getHeight());

        g.setColor(0x0000ff);

        g.drawString("Lat, Lon (" + GIS.formatDouble(lat, 5) + ", " + GIS.formatDouble(lon, 5) + ")", 0, lineHeight * (line++), Graphics.TOP | Graphics.LEFT);

    }

}

public class GISMIDlet extends MIDlet implements CommandListener, LocationListener

{

    private Command exitCmd = new Command("Exit", Command.EXIT, 1);

//private Form mainForm;

    private MyCanvas myCanvas;

    protected double lat; // 纬度

    protected double lon; // 经度

//private LocationProvider locationProvider;

//private TextField latField; // 緯度欄位

//private TextField lonField; // 經度欄位

    public GISMIDlet()

    {

        /* mainForm = new Form("GIS 經緯度測試");

        latField = new TextField("緯度:", formatDouble(lat, 5), 15,

        TextField.DECIMAL); // 設定緯度欄位格式

        lonField = new TextField("經度:", formatDouble(lon, 5), 15,

        TextField.DECIMAL); // 設定經度欄位格式

        mainForm.append(latField); // 增加緯度欄位