在我的应用中，我想在一张地图中显示两个纬度和长点。我得到一个值为当前位置lat和long以及其他值作为手动输入。我用不同的标记标记这两个点
但是我能够在地图中只看到一个标记，也就是当前位置。以下是我的代码，
MapView mapView;
MapController mc,mc1;
GeoPoint p,q;
double latPoint,lngPoint;
double latPoint1 = 9.909186;
double lngPoint1 = 78.102936;
class MapOverlay extends com.google.android.maps.Overlay
{
public boolean draw(Canvas canvas, MapView mapView,boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
//---add the marker---
Bitmap bmp = BitmapFactory.decodeResource
(
getResources(), R.drawable.pin);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);
return true;
}
}
class SitesOverlay extends com.google.android.maps.Overlay
{
public boolean draw(Canvas canvas, MapView mapView,boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
Point screenPts = new Point();
mapView.getProjection().toPixels(q, screenPts);
//---add the marker---
Bitmap bmp = BitmapFactory.decodeResource
(
getResources(), R.drawable.marker);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);
return true;
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mapview);
mapView = (MapView) findViewById(R.id.mapView);
LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);
android.view.View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView,
new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
mc = mapView.getController();
mc1 = mapView.getController();
LocationManager myManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
if(myManager != null)
{
//List list = myManager.getAllProviders();
String param = (String)myManager.getProviders(true).get(0);
Location loc = myManager.getLastKnownLocation(param);
if(loc != null)
{
latPoint = loc.getLatitude();
lngPoint = loc.getLongitude();
}
else
Log.e("GoogleMaps ","Error: Location is null");
}
else
Log.e("GoogleMaps ","Error: Location Manager is null");
p = new GeoPoint
(
(int) (latPoint * 1E6),
(int) (lngPoint * 1E6)
);
mc.animateTo(p);
mc.setZoom(17);
mapView.invalidate();
//---Add a location marker---
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
q = new GeoPoint
(
(int) (latPoint1 * 1E6),
(int) (lngPoint1 * 1E6)
);
mc1.animateTo(q);
mc1.setZoom(17);
mapView.invalidate();
SitesOverlay sitesOverlay = new SitesOverlay();
List<Overlay> listOfOverlays1 = mapView.getOverlays();
listOfOverlays1.clear();
listOfOverlays1.add(mapOverlay);
mapView.invalidate();
请帮帮我朋友......
答案 0 :(得分：0)
以下是我用于在单个地图中获取两个位置的代码。一个是当前位置广告，另一个是我自己的
给出的值public class ViewMap extends MapActivity
{
MapView mapView;
MapController mc,mc1;
GeoPoint p,q;
double latPoint,latPoint1,lngPoint,lngPoint1;
private List<Overlay> mapOverlays;
private Projection projection;
int fromlatE6,fromlonE6,tolatE6,tolonE6;
class MapOverlay extends com.google.android.maps.Overlay
{
public boolean draw(Canvas canvas, MapView mapView,boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pin);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);
mapView.getProjection().toPixels(q, screenPts);
Bitmap bmp1 = BitmapFactory.decodeResource(getResources(), R.drawable.marker);
canvas.drawBitmap(bmp1, screenPts.x, screenPts.y-50, null);
return true;
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mapview);
latPoint1 = Double.valueOf(RestingSpotProfile.LAT);
lngPoint1 = Double.valueOf(RestingSpotProfile.LON);
mapView = (MapView) findViewById(R.id.mapView);
LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);
android.view.View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView, new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
mc = mapView.getController();
mc1 = mapView.getController();
LocationManager myManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
if(myManager != null)
{
String param = (String)myManager.getProviders(true).get(0);
Location loc = myManager.getLastKnownLocation(param);
if(loc != null)
{
latPoint = loc.getLatitude();
lngPoint = loc.getLongitude();
}
else
Log.e("GoogleMaps ","Error: Location is null");
}
else
Log.e("GoogleMaps ","Error: Location Manager is null");
p = new GeoPoint
(
(int) (latPoint * 1E6),
(int) (lngPoint * 1E6)
);
//---Add a location marker---
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
q = new GeoPoint((int) ((latPoint1 + 2.0)* 1E6), (int) ((lngPoint1 + 2.0)* 1E6));
tolonE6=(int)((latPoint + 2.0)*1e6);
tolatE6=(int)((lngPoint + 2.0)*1e6);
mc.animateTo(p);
mc.setZoom(9);
//---Add a location marker---
MapOverlay mapOverlay1 = new MapOverlay();
List<Overlay> listOfOverlays1 = mapView.getOverlays();
listOfOverlays1.clear();
listOfOverlays.add(mapOverlay1);
mapView.invalidate();
mc1.animateTo(q);
mc1.setZoom(17);
mapView.invalidate();
mapView.invalidate();
}
@Override
protected boolean isRouteDisplayed()
{
return false;
}
public class MyOverlay extends Overlay
{
private GeoPoint gp1;
private GeoPoint gp2;
public MyOverlay(int fromlatE6,int fromlonE6,int tolatE6,int tologE6)
{
int flat=0,flog=0,tlat=0,tlog=0;
flat=fromlatE6;
flog=fromlonE6;
tlat=tolatE6;
tlog=tologE6;
gp1 = new GeoPoint(flat,flog);
gp2 = new GeoPoint(tlat,tlog);
}
}
}