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?
答案 0 :(得分:9)
最近我有一个想法使用来自Google Maps website的Browser.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)