Namespaces

Variants
Actions

Please note that as of October 24, 2014, the Nokia Developer Wiki will no longer be accepting user contributions, including new entries, edits and comments, as we begin transitioning to our new home, in the Windows Phone Development Wiki. We plan to move over the majority of the existing entries over the next few weeks. Thanks for all your past and future contributions.

Java ME Location API(中文)

From Wiki
Jump to: navigation, search
WP Metro Icon Chinese.png
Article Metadata

文章
翻译:
User:Linux achi
最后由 hamishwillee 在 26 Jun 2013 编辑
Location API是JSR 179用來尋找像經緯度的位置資訊。

這裡有一個程式碼範例:

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.location.*;
 
 
public class loctest extends MIDlet implements CommandListener
{
private Display display;
private Form form;
private Command cmdExit,cmdOK;
private StringItem si;
 
public loctest()
{
display = Display.getDisplay(this);
form = new Form("Location Api test");
cmdExit = new Command("Exit",Command.EXIT,5);
cmdOK = new Command("OK",Command.OK,1);
si = new StringItem("Geo Location", "Click OK");
form.append(si);
form.addCommand(cmdOK);
form.addCommand(cmdExit);
form.setCommandListener(this);
}
 
public void startApp()
{
display.setCurrent(form);
}
 
public void pauseApp()
{
}
 
public void destroyApp(boolean flag)
{
notifyDestroyed();
}
 
public void commandAction(Command c, Displayable d)
{
if (c == cmdOK){
Retriever ret = new Retriever(this);
ret.start();
} else if (c == cmdExit) {
destroyApp(false);
}
}
 
public void displayString(String string)
{
si.setText(string);
}
}
 
 
class Retriever extends Thread
{
private loctest midlet;
public Retriever(loctest midlet)
{
this.midlet = midlet;
}
 
public void run()
{
try
{
checkLocation();
}
catch (Exception ex)
{
ex.printStackTrace();
midlet.displayString(ex.toString());
}
}
 
public void checkLocation() throws Exception
{
String string;
Location l;
LocationProvider lp;
Coordinates c;
 
Criteria cr= new Criteria();
cr.setHorizontalAccuracy(500);
 
lp= LocationProvider.getInstance(cr);
l = lp.getLocation(60);
 
c = l.getQualifiedCoordinates();
if(c != null ) {
// Use coordinate information
double lat = c.getLatitude();
double lon = c.getLongitude();
string = "\nLatitude : " + lat + "\nLongitude : " + lon;
} else {
string ="Location API failed";
}
midlet.displayString(string);
}
}

相关链接

This page was last modified on 26 June 2013, at 05:20.
161 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×