我将诺基亚示例代码用于Google Map。它有retrieveStaticImage方法，可以加载和返回一个Image。我把它们加载到ImageItem但是我每次都得到一个异常.. 这是我的代码......
GoogleMaps类的代码
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
public class GoogleMaps implements Runnable{
private static final String URL_UNRESERVED =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"abcdefghijklmnopqrstuvwxyz" +
"0123456789-_.~";
private static final char[] HEX = "0123456789ABCDEF".toCharArray();
Image image;
int width;
int height;
double lat;
double lng;
int zoom;
String format;
ImageItem imagecmpt;
// these 2 properties will be used with map scrolling methods. You can remove them if not needed
public static final int offset = 268435456;
public static final double radius = offset / Math.PI;
private String apiKey = null;
public GoogleMaps(String key,int width, int height, double lat, double lng, int zoom,
String format,ImageItem img) {
this.width=width;
this.height=height;
this.lat=lat;
this.lng=lng;
this.zoom=zoom;
this.format=format;
apiKey = key;
}
public double[] geocodeAddress(String address) throws Exception {
byte[] res = loadHttpFile(getGeocodeUrl(address));
String[] data = split(new String(res), ',');
if (!data[0].equals("200")) {
int errorCode = Integer.parseInt(data[0]);
throw new Exception("Google Maps Exception: " + getGeocodeError(errorCode));
}
return new double[] {
Double.parseDouble(data[2]), Double.parseDouble(data[3])
};
}
public Image retrieveStaticImage() throws IOException {
byte[] imageData = loadHttpFile(getMapUrl(width, height, lng, lat, zoom, format));
System.out.println("Address is "+getMapUrl(width, height, lng, lat, zoom, format));
for (int i=0;i<imageData.length;i++){
System.out.println(imageData[i]);
}
return Image.createImage(imageData, 0, imageData.length);
}
private static String getGeocodeError(int errorCode) {
switch (errorCode) {
case 400:
return "Bad request";
case 500:
return "Server error";
case 601:
return "Missing query";
case 602:
return "Unknown address";
case 603:
return "Unavailable address";
case 604:
return "Unknown directions";
case 610:
return "Bad API key";
case 620:
return "Too many queries";
default:
return "Generic error";
}
}
private String getGeocodeUrl(String address) {
return "http://maps.google.com/maps/geo?q=" + urlEncode(address) + "&output=csv&key="
+ apiKey;
}
private String getMapUrl(int width, int height, double lng, double lat, int zoom, String format) {
return "http://maps.google.com/staticmap?center=" + lat + "," + lng + "&format="
+ format + "&zoom=" + zoom + "&size=" + width + "x" + height + "&key=" + apiKey;
}
private static String urlEncode(String str) {
StringBuffer buf = new StringBuffer();
byte[] bytes = null;
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);
dos.writeUTF(str);
bytes = bos.toByteArray();
} catch (IOException e) {
// ignore
}
for (int i = 2; i < bytes.length; i++) {
byte b = bytes[i];
if (URL_UNRESERVED.indexOf(b) >= 0) {
buf.append((char) b);
} else {
buf.append('%').append(HEX[(b >> 4) & 0x0f]).append(HEX[b & 0x0f]);
}
}
return buf.toString();
}
private static byte[] loadHttpFile(String url) throws IOException {
byte[] byteBuffer;
HttpConnection hc = (HttpConnection) Connector.open(url);
try {
hc.setRequestMethod(HttpConnection.GET);
InputStream is = hc.openInputStream();
try {
int len = (int) hc.getLength();
if (len > 0) {
byteBuffer = new byte[len];
int done = 0;
while (done < len) {
done += is.read(byteBuffer, done, len - done);
}
} else {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[512];
int count;
while ( (count = is.read(buffer)) >= 0 ) {
bos.write(buffer, 0, count);
}
byteBuffer = bos.toByteArray();
}
} finally {
is.close();
}
} finally {
hc.close();
}
return byteBuffer;
}
private static String[] split(String s, int chr) {
Vector res = new Vector();
int curr;
int prev = 0;
while ( (curr = s.indexOf(chr, prev)) >= 0 ) {
res.addElement(s.substring(prev, curr));
prev = curr + 1;
}
res.addElement(s.substring(prev));
String[] splitted = new String[res.size()];
res.copyInto(splitted);
return splitted;
}
public void run() {
try{
//throw new UnsupportedOperationException("Not supported yet.");
imagecmpt.setImage(retrieveStaticImage());
}
catch(Exception e){
System.out.println("Error ......."+e);
}
}
}
midlet代码
public void commandAction(Command command, Displayable displayable) {
// write pre-action user code here
if (displayable == form) {
if (command == exitCommand) {
// write pre-action user code here
exitMIDlet();
// write post-action user code here
} else if (command == okCommand) {
// write pre-action user code here
// write post-action user code here
GoogleMaps cMz=new GoogleMaps("ABQIAAAADEQoVqbqS5pT4ahHSLALyBT8PMUw5z7_OLJoE1lh2VQyfb-WOxTwS9t9mrSq_flhdPeVGOQrxXuCFQ",10, 10, 10, 10, 1, "roadmap", imageItem);
Thread th=new Thread(cMz);
th.run();
Display display=getDisplay ();
}
}
// write post-action user code here
}
我的输出:::
Starting emulator in execution mode
Running with storage root DefaultColorPhone
Running with locale: English_United States.1252
Running in the identified_third_party security domain
Warning: To avoid potential deadlock, operations that may block, such as
networking, should be performed in a different thread than the
commandAction() handler.
我使用了外部线程，但它一直告诉我使用另一个线程.. 我该如何解决这个问题？
答案 0 :(得分：1)
尝试
new Thread(new Runnable(){
GoogleMaps cMz=new GoogleMaps("ABQIAAAADEQoVqbqS5pT4ahHSLALyBT8PMUw5z7_OLJoE1lh2VQyfb-WOxTwS9t9mrSq_flhdPeVGOQrxXuCFQ",10, 10, 10, 10, 1, "roadmap", imageItem);
//put here action
}
).start();