在Blackberry应用程序中使用Google Map

时间:2009-09-07 05:35:07

标签: google-maps blackberry gps jsr179

有谁能告诉我如何在黑莓应用程序开发中使用谷歌地图而不是黑莓地图?

3 个答案:

答案 0 :(得分:9)

最近我有一个想法使用来自Google Maps websiteBrowser.Field,但由于GMaps基于JavaScript而且它受到Blackberry原生浏览器的严重支持,因此无法实现。

实际上,在Blackberry上有两种使用Google地图的方式:

答案 1 :(得分:0)

这是一个小例子:

用于查看Google地图静态图片的表单:

public class frmMap extends Form implements CommandListener {

    Command _back;
    MIDlet midlet;
    Form dis;

    public frmMap(String title, ImageItem img, MIDlet m, Form d){
        super(null);

        this.midlet = m;
        this.dis = d;

        _back = new Command("Back", Command.BACK, 1);
        addCommand(_back);
        append(img);
        setCommandListener(this);        
    }

    public void commandAction(Command c, Displayable d) {
        if(c == _back){
            Display.getDisplay(midlet).setCurrent(dis);
        }
    }

}

要下载静态图像的类inet类:

public class INETclass implements Runnable {

    private String _location = null;
    private HttpConnection inet;
    private Pispaal _m;
    public String url = null;

    public INETclass(String location, Pispaal m){
        _location = location;
        _m = m;        
    }

    public void run() {
        try
        {
            //Setup the connection
            inet = (HttpConnection)Connector.open(url);
            inet.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            int rc = inet.getResponseCode();

            //Responsecode controleren
            if(rc == HttpConnection.HTTP_OK){
                //Open input stream to read the respone
                DataInputStream is = new DataInputStream(inet.openInputStream());                
                StringBuffer sb = new StringBuffer();

                int ch;
                long len = -1;
                byte[] buffer = null;
                if(_location == null){
                    len = is.available();
                }

                if(len != -1){
                    if(_location == null){
                        buffer = IOUtilities.streamToBytes(is);
                    }else{
                        while((ch = is.read()) != -1){
                            sb.append((char)ch);
                        }
                    }
                }
                is.close();

                if(_location == null){
                    _m.OnINETComplete(buffer);
                }else{
                    _m.Alert(sb.toString());
                }
            }else{
                _m.Alert("URL " + url + " geeft response code: " + rc);
                try
                {
                    inet.close();
                }catch(Exception e){
                    _m.Alert("Error: " + e.getMessage());
                }
            }

        }
        catch(Exception e)
        {
            _m.Alert("Error: " + e.getMessage());
            System.out.println("Error: " + e.getMessage());
        }
        finally
        {
            try
            {
                if(inet != null){ inet.close(); }  
                Thread.currentThread().join(); //Making sure this thread dies
            }catch(Exception e){
                _m.Alert("Error: " + e.getMessage());
                System.out.println("Error: " + e.getMessage());
            }
        }
    }
}

启动下载的Button操作和加载表单以查看图像的回调操作

public void commandAction(Command c, Displayable d) {
        synchronized(c){
            String loc = _location.getText();
            if(loc.indexOf(",") > 0){
                //if(c == _strCommand){                
                    //INETclass inet = new INETclass(loc, this);
                    //Thread tInet = new Thread(inet);
                    //tInet.start();
                    //Alert("Locatie word doorgestuurd. Even geduld");
                //}else 
                if(c == _mapView){
                    INETclass inet = new INETclass(null, this);
                    inet.url = "http://www.qeueq.com/gmap.php?location=" + this.lat + "," + this.lon + "&size=" + this.width + "x" + this.height + ";deviceside=true";
                    Thread tInet = new Thread(inet);
                    tInet.start();
                }
            }else{
                Alert("GPS locatie is nog niet beschikbaar.");
            }
        }
    }

public void UpdateLocation(double lat, double lon){
       String location = lat + "," + lon;
       this.lat = lat;
       this.lon = lon;
       synchronized(location){
           _location.setText(location);
            INETclass inet = new INETclass(location, this);
            Thread tInet = new Thread(inet);
            tInet.start();           
       } 
    }

优化和编辑代码,使其符合您的需求。花了我一些时间来做对。

答案 2 :(得分:0)

现在可以使用谷歌地图而不是黑莓地图与我们自己的数据,如图像。 enter image description here

如果您希望使用Google地图来显示自己的位置/标记,则可以使用应用中的ApplicationDescriptor来调用Google地图。使用CodeModuleManager.getModuleHandle("GoogleMaps");检查设备上的Google地图,它会返回一个非零表示可用的整数。然后,您可以在KML文件中添加位置,甚至可以使用KML文件标记自定义位置指针。

由Max链接的 example 仅允许使用单个标记。因此,如果要添加多个标记,则需要KML文件。

您可以查看初学者的简单教程 here