How to get Location Using Location API JSR 179

最新推荐文章于 2020-04-22 17:21:04 发布

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#api #exception #command #import #string #class

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本文提供了一个使用JSR 179定位API的Java Midlet示例程序，展示了如何获取设备的位置信息，包括经纬度、海拔及国家地址等详细地理数据。

/*
    * This Midlet is for getting the lat, lon and country info.
    @ author Senthil
*/

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.location.*;

public class LocationMidlet
extends MIDlet
implements CommandListener
{

    Command Exit = new Command("Exit", Command.EXIT, 0);
    private StringItem location = new StringItem("/n Location:", "");
    public QualifiedCoordinates qc;

    public LocationMidlet()
    {
    }

    public void startApp()
    {
Form f = new Form("Location Demo");
f.append("Finding for location.../n");
f.addCommand(Exit);
f.setCommandListener(this);
Display.getDisplay(this).setCurrent(f);
try
{
    Criteria c = new Criteria();
    c.setHorizontalAccuracy(500);
    c.setVerticalAccuracy(500);
    c.setPreferredPowerConsumption(Criteria.POWER_USAGE_LOW);
    LocationProvider lp = LocationProvider.getInstance(c);
    Location loc = lp.getLocation(60);
    qc = loc.getQualifiedCoordinates();
    AddressInfo adinfo = loc.getAddressInfo();
    String place = "";
    if (adinfo != null)
    {
place = adinfo.getField(AddressInfo.COUNTRY);
    }
    f.append("Address: " + place + "/n");
    f.append("Alt: " + qc.getAltitude() + "/n");
    f.append("Lat: " + qc.getLatitude() + "/n");
    f.append("Long: " + qc.getLongitude() + "/n");
}
catch (Exception e)
{
    f.append("Exception: " + e);
}
    }

    public void pauseApp()
    {
    }

    public void destroyApp(boolean destroy)
    {
    }

    public void commandAction(Command c, Displayable s)
    {
if (c == Exit)
{
    destroyApp(true);
    notifyDestroyed();
}
    }
}