问题描述
我们刚刚开始使用Android上的Google Maps，并设置了GeoServer，以提供我们想要添加为地图叠加层的图块.到目前为止，我已经按照一些教程和参考资料开始使用.
We are just starting to work with Google Maps on Android and have a GeoServer set up to provide tiles which we would like to add as overlay on the map. So far, I have followed a few tutorials and references to get started.
- For getting MyLocation
- Setting up WMS on Android
- WMS Reference
问题:当我设置断点并将URL复制并粘贴到浏览器，它不会作为Android设备上的叠加层加载到地图上.阅读 this 我不确定是否会出现任何错误，因为它们表明错误已被忽略.
The problem: While the url that I am generating in the getTileUrl function in the TileProviderFactory does indeed return a png image when I set a breakpoint and copy and paste the url into a browser, it does not load onto the map as an overlay on the Android device. There are no errors being thrown from what I can see and after reading this I am not sure if there will be any as they have indicated that the errors are being muted.
我想知道的是，如果您可以看到我的代码中有任何直接问题，或者有任何调试建议，则可以在其中告诉应用程序是否正在与我的GeoServer通信来检索图像与否.我查看了GeoServer上的日志，似乎只有我的浏览器请求正在处理中，并且没有收到来自Android的任何请求(很难分辨，因为我们还有其他使用该服务器的应用程序). Android手机通过wifi和手机连接，并启用了gps.作为最后的选择，我尝试过更改图块叠加层zIndex并将其设置为visible，但这似乎没有任何区别.
What I am wondering is if you can see any immediate issues in my code or have any suggestions for debugging where I will be able to tell if the application is actually communicating with my GeoServer to retrieve the image or not. I've looked at the log on the GeoServer and it seems as though only my browser requests are going through and it's not receiving any requests from Android (it's a bit difficult to tell because we have other applications using the server as well). The Android phone is connected by both wifi and cell and has gps enabled. As a last resort I have tried changing the tile overlay zIndex and setting it to visible but this didn't seem to make any difference.
此时，Android设备肯定不与GeoServer通信.
Android device is definitely NOT communicating with GeoServer at this point.
能够从网站加载静态图像(例如此)作为叠加层，发现我收到了以下异常测试对形成的URL的HTTP请求:
EDIT 2: Able to load static images from websites(like this) as overlays and found that I am getting the following exception on testing out an HTTP Request to the formed URL:
W/System.err(10601): java.net.SocketException: The operation timed out
W/System.err(10601): at org.apache.harmony.luni.platform.OSNetworkSystem
.connectStreamWithTimeoutSocketImpl(Native Method)
W/System.err(10601): at org.apache.harmony.luni.net.PlainSocketImpl
.connect(PlainSocketImpl.java:244)
W/System.err(10601): at org.apache.harmony.luni.net.PlainSocketImpl
.connect(PlainSocketImpl.java:533)
W/System.err(10601): at java.net.Socket
.connect(Socket.java:1074)
W/System.err(10601): at org.apache.http.conn.scheme.PlainSocketFactory
.connectSocket(PlainSocketFactory.java:119)
谢谢.
public class MapTestActivity extends FragmentActivity
implements LocationListener, LocationSource{
private GoogleMap mMap;
private OnLocationChangedListener mListener;
private LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map_test);
setupLocationManager();
setupMapIfNeeded();
}
private void setupLocationManager() {
this.locationManager =
(LocationManager) getSystemService(LOCATION_SERVICE);
if (locationManager != null) {
boolean gpsIsEnabled = locationManager.isProviderEnabled(
LocationManager.GPS_PROVIDER);
boolean networkIsEnabled = locationManager.isProviderEnabled(
LocationManager.NETWORK_PROVIDER);
if(gpsIsEnabled) {
this.locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 5000L, 10F, this);
}
else if(networkIsEnabled) {
this.locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 5000L, 10F, this);
}
else {
//Show an error dialog that GPS is disabled...
}
}
else {
// Show some generic error dialog because
// something must have gone wrong with location manager.
}
}
private void setupMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the
// map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
mMap.setLocationSource(this);
}
}
private void setUpMap() {
// TODO Auto-generated method stub
mMap.setMyLocationEnabled(true);
TileProvider geoServerTileProvider = TileProviderFactory
.getGeoServerTileProvider();
TileOverlay geoServerTileOverlay = mMap.addTileOverlay(
new TileOverlayOptions()
.tileProvider(geoServerTileProvider)
.zIndex(10000)
.visible(true));
}
// Non-relevant listener methods removed
}
TileProviderFactory
public class TileProviderFactory {
public static GeoServerTileProvider getGeoServerTileProvider() {
String baseURL = "mytileserver.com";
String version = "1.3.0";
String request = "GetMap";
String format = "image/png";
String srs = "EPSG:900913";
String service = "WMS";
String width = "256";
String height = "256";
String styles = "";
String layers = "wtx:road_hazards";
final String URL_STRING = baseURL +
"&LAYERS=" + layers +
"&VERSION=" + version +
"&SERVICE=" + service +
"&REQUEST=" + request +
"&TRANSPARENT=TRUE&STYLES=" + styles +
"&FORMAT=" + format +
"&SRS=" + srs +
"&BBOX=%f,%f,%f,%f" +
"&WIDTH=" + width +
"&HEIGHT=" + height;
GeoServerTileProvider tileProvider =
new GeoServerTileProvider(256,256) {
@Override
public synchronized URL getTileUrl(int x, int y, int zoom) {
try {
double[] bbox = getBoundingBox(x, y, zoom);
String s = String.format(Locale.US, URL_STRING, bbox[MINX],
bbox[MINY], bbox[MAXX], bbox[MAXY]);
Log.d("GeoServerTileURL", s);
URL url = null;
try {
url = new URL(s);
}
catch (MalformedURLException e) {
throw new AssertionError(e);
}
return url;
}
catch (RuntimeException e) {
Log.d("GeoServerTileException",
"getTile x=" + x + ", y=" + y +
", zoomLevel=" + zoom +
" raised an exception", e);
throw e;
}
}
};
return tileProvider;
}
}
GeoServerTileProvider
public abstract class GeoServerTileProvider extends UrlTileProvider{
// Web Mercator n/w corner of the map.
private static final double[] TILE_ORIGIN =
{-20037508.34789244, 20037508.34789244};
//array indexes for that data
private static final int ORIG_X = 0;
private static final int ORIG_Y = 1; // "
// Size of square world map in meters, using WebMerc projection.
private static final double MAP_SIZE = 20037508.34789244 * 2;
// array indexes for array to hold bounding boxes.
protected static final int MINX = 0;
protected static final int MINY = 1;
protected static final int MAXX = 2;
protected static final int MAXY = 3;
public GeoServerTileProvider(int width, int height) {
super(width, height);
}
// Return a web Mercator bounding box given tile x/y indexes and a zoom
// level.
protected double[] getBoundingBox(int x, int y, int zoom) {
double tileSize = MAP_SIZE / Math.pow(2, zoom);
double minx = TILE_ORIGIN[ORIG_X] + x * tileSize;
double maxx = TILE_ORIGIN[ORIG_X] + (x+1) * tileSize;
double miny = TILE_ORIGIN[ORIG_Y] - (y+1) * tileSize;
double maxy = TILE_ORIGIN[ORIG_Y] - y * tileSize;
double[] bbox = new double[4];
bbox[MINX] = minx;
bbox[MINY] = miny;
bbox[MAXX] = maxx;
bbox[MAXY] = maxy;
return bbox;
}
}
推荐答案
这原来是网络问题，与我的正确"实现完全无关.我想这个问题对于其他开始使用Android + GeoServer实施的人来说将是一个很好的例子，所以我不再赘述.
This turned out to be a network issue and completely unrelated to my implementation which is "correct". I guess this question will serve well as an example for others who are getting started with Android + GeoServer implementation so I will leave it up.
这篇关于在具有GeoServer的Android应用程序中使用getTileURL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！