我已经获得了数组列表中附近位置的所有搜索结果，但我无法在地图上显示它们。
当我调试我的应用程序时，在SitesOverlay()构造函数中添加断点，的位置已填充，但如果我作为android应用程序运行则不会。
我的代码如下：
public class Map1 extends MapActivity {
private MapView map = null;
private MyLocationOverlay me = null;
double source_lat;
double source_lng;
double destination_lat = 12.899915;
double destination_lng = 80.243969;
Boolean isLocationFound = false;
List<Place> arlPlaces = new ArrayList<Place>();
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new Thread(new Runnable() {
public void run() {
System.out.println("@#@#@#@# main() @#@#@#@#");
String strRequestUrl = "";
try {
URL url = new URL(strRequestUrl);
URLConnection yc = url.openConnection();
BufferedReader in = new BufferedReader(
new InputStreamReader(yc.getInputStream()));
String inputLine;
Place place = null;
while ((inputLine = in.readLine()) != null) {
if (inputLine.contains("name")) {
place = new Place();
place.setStrName(inputLine.substring(
inputLine.indexOf(">") + 1,
inputLine.lastIndexOf("<")));
}
if (inputLine.contains("vicinity")) {
place.setStrAddress(inputLine.substring(
inputLine.indexOf(">") + 1,
inputLine.lastIndexOf("<")));
}
if (inputLine.contains("lat")) {
place.setDblLatitude(Double.valueOf(inputLine
.substring(inputLine.indexOf(">") + 1,
inputLine.lastIndexOf("<"))));
}
if (inputLine.contains("lng")) {
place.setDblLongitude(Double.valueOf(inputLine
.substring(inputLine.indexOf(">") + 1,
inputLine.lastIndexOf("<"))));
arlPlaces.add(place);
}
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
map = (MapView) findViewById(R.id.map);
map.getController().setCenter(getPoint(12.899915, 80.243969));
map.setStreetView(true);
map.setSatellite(false);
map.getController().setZoom(15);
map.setBuiltInZoomControls(true);
Drawable marker = getResources().getDrawable(R.drawable.marker);
marker.setBounds(0, 0, marker.getIntrinsicWidth(),
marker.getIntrinsicHeight());
map.getOverlays().add(new SitesOverlay(marker));
me = new MyLocationOverlay(this, map);
map.getOverlays().add(me);
Button b1 = (Button) findViewById(R.id.button1);
Button b2 = (Button) findViewById(R.id.button2);
Button btnNearby = (Button) findViewById(R.id.button3);
btnNearby.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
}
});
b2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.button2:
if (map.isSatellite() == false) {
map.setSatellite(true);
}
break;
}
}
});
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
if (map.isSatellite() == true) {
map.setSatellite(false);
}
break;
}
}
});
}
@Override
protected boolean isRouteDisplayed() {
return (false);
}
private GeoPoint getPoint(double lat, double lon) {
return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
}
private class SitesOverlay extends ItemizedOverlay<OverlayItem> {
private List<OverlayItem> items = new ArrayList<OverlayItem>();
public SitesOverlay(Drawable marker) {
super(marker);
boundCenterBottom(marker);
items.add(new OverlayItem(getPoint(12.899915, 80.243969), "",
"Mantri Signature Villas" + "\n" + "ECR Link Road, Chennai"));
Iterator<Place> iterator = arlPlaces.iterator();
while (iterator.hasNext()) {
Place place = (Place) iterator.next();
System.out.println("@#@$#@#$@#!#@$@$#@ iterator");
items.add(new OverlayItem(getPoint(place.getDblLatitude(),
place.getDblLongitude()),place.getStrName(), place.getStrAddress()));
}
populate();
}
@Override
protected OverlayItem createItem(int i) {
return (items.get(i));
}
@Override
protected boolean onTap(final int i) {
// Toast.makeText(A.this,
// items.get(i).getSnippet(),
// Toast.LENGTH_SHORT).show();
AlertDialog.Builder alert = new AlertDialog.Builder(Map1.this);
if (items
.get(i)
.getSnippet()
.equalsIgnoreCase(
"Mantri Signature Villas\nECR Link Road, Chennai")) {
alert.setTitle(items.get(i).getSnippet());
alert.setMessage("Would you like to find the Route?");
// alert.setIcon(R.drawable.mnlo);
alert.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location myLocation1 = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location myLocation = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (myLocation != null) {
String uri = "http://maps.google.com/maps?saddr="
+ (myLocation.getLatitude())
+ ","
+ (myLocation.getLongitude())
+ "&daddr="
+ destination_lat
+ ","
+ destination_lng;
Intent intent = new Intent(
android.content.Intent.ACTION_VIEW,
Uri.parse(uri));
intent.setClassName(
"com.google.android.apps.maps",
"com.google.android.maps.MapsActivity");
startActivity(intent);
} else if (myLocation1 != null) {
String uri = "http://maps.google.com/maps?saddr="
+ (myLocation1.getLatitude())
+ ","
+ (myLocation1.getLongitude())
+ "&daddr="
+ destination_lat
+ ","
+ destination_lng;
Intent intent = new Intent(
android.content.Intent.ACTION_VIEW,
Uri.parse(uri));
intent.setClassName(
"com.google.android.apps.maps",
"com.google.android.maps.MapsActivity");
startActivity(intent);
} else {
Intent intent = new Intent(
getBaseContext(), Map1.class);
startActivity(intent);
}
}
});
alert.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
alert.show();
} else {
alert.setTitle(items.get(i).getSnippet());
alert.setMessage("Would you like to find the Route?");
alert.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String uri = "http://maps.google.com/maps?saddr="
+ items.get(i).getPoint()
+ "&daddr="
+ destination_lat
+ ","
+ destination_lng;
Intent intent = new Intent(
android.content.Intent.ACTION_VIEW, Uri
.parse(uri));
intent.setClassName(
"com.google.android.apps.maps",
"com.google.android.maps.MapsActivity");
startActivity(intent);
}
});
alert.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
alert.show();
}
return (true);
}
public int size() {
return (items.size());
}
}
}
答案 0 :(得分：0)
您应该在线程完成后填充地图。您的代码不会等待，直到它在start（）方法之后完成。
我建议您尝试在线程结束时使用Hanlder，或者使用AsyncTask。我赞成后者。
它可能在调试期间有效，因为在将标记添加到地图之前已完成线程。
答案 1 :(得分：0)
下面的代码用于在mapview上显示道路，这可能不会100％为您工作，因为您可能需要调整到您自己的代码，但随时可以提问。
在您的活动中：
public class NavigationTask extends AsyncTask<Void, Void, Void> {
Road mRoad;
String startname = "", destname ="";
@Override
protected Void doInBackground(Void... params) {
String url = getUrl(Double.parseDouble(driveobj.get("startLocationLat")), Double.parseDouble(driveobj.get("startLocationLon")), Double.parseDouble(driveobj.get("endLocationLat")), Double.parseDouble(driveobj.get("endLocationLon")));
String json = Internet.request(url, null);
mRoad = RoadProvider.getRoute(json);
return null;
}
@Override
protected void onPostExecute(Void result) {
//from.setText(startname);
//to.setText(destname);
MapOverlay mapOverlay = new MapOverlay(mRoad, mapview);
List<Overlay> listOfOverlays = mapview.getOverlays();
listOfOverlays.add(mapOverlay);
mapview.invalidate();
super.onPostExecute(result);
}
}
public String getUrl(double fromLat, double fromLon, double toLat, double toLon) {
StringBuffer urlString = new StringBuffer();
urlString.append("http://maps.googleapis.com/maps/api/directions/json?origin=");
urlString.append(Double.toString(fromLat));
urlString.append(",");
urlString.append(Double.toString(fromLon));
urlString.append("&destination=");// to
urlString.append(Double.toString(toLat));
urlString.append(",");
urlString.append(Double.toString(toLon));
urlString.append("&sensor=true");
return urlString.toString();
}
MapOverlay类
class MapOverlay extends com.google.android.maps.Overlay {
Road mRoad;
ArrayList<GeoPoint> mPoints = new ArrayList<GeoPoint>();;
public MapOverlay(Road road, MapView mv) {
mRoad = road;
if (road.points.size() > 0) {
mPoints.addAll(road.points);
showMarkers(mPoints);
int moveToLat = (mPoints.get(0).getLatitudeE6() + (mPoints.get(mPoints.size() - 1).getLatitudeE6() - mPoints.get(0).getLatitudeE6()) / 2);
int moveToLong = (mPoints.get(0).getLongitudeE6() + (mPoints.get(mPoints.size() - 1).getLongitudeE6() - mPoints.get(0).getLongitudeE6()) / 2);
GeoPoint moveTo = new GeoPoint(moveToLat, moveToLong);
int minLatitude = Integer.MAX_VALUE;
int maxLatitude = Integer.MIN_VALUE;
int minLongitude = Integer.MAX_VALUE;
int maxLongitude = Integer.MIN_VALUE;
for (GeoPoint p : mPoints) {
int lati = p.getLatitudeE6();
int lon = p.getLongitudeE6();
maxLatitude = Math.max(lati, maxLatitude);
minLatitude = Math.min(lati, minLatitude);
maxLongitude = Math.max(lon, maxLongitude);
minLongitude = Math.min(lon, minLongitude);
}
MapController mapController = mv.getController();
mapController.zoomToSpan(Math.abs(maxLatitude - minLatitude), Math.abs(maxLongitude - minLongitude));
}
}
@Override
public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) {
super.draw(canvas, mv, shadow);
drawPath(mv, canvas);
return true;
}
public void drawPath(MapView mv, Canvas canvas) {
int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
Paint paint = new Paint();
paint.setColor(LO.titleBackgroundColor+0xDE000000);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
for (int i = 0; i < mPoints.size(); i++) {
Point point = new Point();
mv.getProjection().toPixels(mPoints.get(i), point);
x2 = point.x;
y2 = point.y;
if (i > 0) {
canvas.drawLine(x1, y1, x2, y2, paint);
}
x1 = x2;
y1 = y2;
}
}
}
MarkerOverLay类：
class MarkerOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> overlays = new ArrayList<OverlayItem>();
public MarkerOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public void addOverlay(OverlayItem overlay) {
overlays.add(overlay);
populate();
}
@Override
protected OverlayItem createItem(int i) {
return overlays.get(i);
}
@Override
public int size() {
return overlays.size();
}
}
RoadProvider类：
public class RoadProvider {
public static Road getRoute(String json) {
Road road = new Road();
try {
JSONObject route = new JSONObject(json);
JSONArray routes = route.getJSONArray("routes");
JSONArray legs = routes.getJSONObject(0).getJSONArray("legs");
JSONArray steps = legs.getJSONObject(0).getJSONArray("steps");
for(int i = 0, len = steps.length(); i < len; i++) {
JSONObject step = steps.getJSONObject(i);
if(i == 0) {
if(step.has("start_location")) {
JSONObject start = step.getJSONObject("start_location");
double lon = Double.parseDouble(start.getString("lng"));
double lat = Double.parseDouble(start.getString("lat"));
GeoPoint point = new GeoPoint((int)(lat * 1E6), (int)(lon * 1E6));
road.add(point);
}
}
if(step.has("end_location")) {
JSONObject start = step.getJSONObject("end_location");
double lon = Double.parseDouble(start.getString("lng"));
double lat = Double.parseDouble(start.getString("lat"));
GeoPoint point = new GeoPoint((int)(lat * 1E6), (int)(lon * 1E6));
road.add(point);
}
}
} catch (Exception e) {
e.fillInStackTrace();
return null;
}
return road;
}
}