Question

我这么长时间都在苦苦挣扎。我想在我的地图上添加叠加层。我正在使用开源OSMdroid。但我得到的例子是从一个角落到另一个角落的直线红线。我的目标是添加一些图标来设置我的geoPoint。

这是我的代码：

 package osmdemo.demo;

import java.util.List;

import microsoft.mappoint.TileSystem;

import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import org.osmdroid.views.MapView.Projection;
import org.osmdroid.views.overlay.Overlay;
import org.osmdroid.views.overlay.ScaleBarOverlay;
import org.osmdroid.views.util.constants.MapViewConstants;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.location.LocationManager;
import android.os.Bundle;

public class map extends Activity implements MapViewConstants
{

    /** Called when the activity is first created. */

    protected static final String PROVIDER_NAME = LocationManager.GPS_PROVIDER;
    MapController mapController;
    MapView mapView;
    ScaleBarOverlay mScaleBarOverlay;
    private MapOverlay mmapOverlay = null;
    private LocationManager mLocMgr;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mapView = (MapView) findViewById(R.id.mapview);

        mapView.setTileSource(TileSourceFactory.MAPNIK);
        mapView.setBuiltInZoomControls(true);
        mapView.setMultiTouchControls(true);

        mapController = mapView.getController();
        mapController.setZoom(20);
        GeoPoint point2 = new GeoPoint(31.987968, 34.783069);
        mapController.setCenter(point2);

        this.mmapOverlay = new MapOverlay(this);

        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.add(mmapOverlay);
        mapView.invalidate();
    }

    public class MapOverlay extends org.osmdroid.views.overlay.Overlay
    {

        public MapOverlay(Context ctx)
        {
            super(ctx);
            // TODO Auto-generated constructor stub
        }

        @Override
        protected void draw(Canvas pC, MapView pOsmv, boolean shadow)
        {
            if (shadow)
                return;

            Paint lp3;
            lp3 = new Paint();
            lp3.setColor(Color.RED);
            lp3.setAntiAlias(true);
            lp3.setStyle(Style.STROKE);
            lp3.setStrokeWidth(1);
            lp3.setTextAlign(Paint.Align.LEFT);
            lp3.setTextSize(12);
            // Calculate the half-world size
            final Rect viewportRect = new Rect();
            final Projection projection = pOsmv.getProjection();
            final int zoomLevel = projection.getZoomLevel();
            int mWorldSize_2 = TileSystem.MapSize(zoomLevel) / 2;

            // Save the Mercator coordinates of what is on the screen
            viewportRect.set(projection.getScreenRect());
            // DON'T set offset with either of below
            // viewportRect.offset(-mWorldSize_2, -mWorldSize_2);
            // viewportRect.offset(mWorldSize_2, mWorldSize_2);

            // Draw a line from one corner to the other
            pC.drawLine(viewportRect.left, viewportRect.top,
                    viewportRect.right, viewportRect.bottom, lp3);
        }

        public void onProviderDisabled(String arg0)
        {
        }

        public void onProviderEnabled(String provider)
        {
        }

    }

}

那是我的宣言：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.overlay" android:versionCode="1" android:versionName="1.0">
    <uses-sdk android:minSdkVersion="3" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


    <application >
        <activity android:name=".OverlayDemo" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

提前致谢，

射线。

Answer 1

自编写示例代码以来，jar版本3.0.3和3.0.4似乎发生了一些变化。

如果您的应用程序基于上一个答案中引用的代码，则更改行

mResourceProxy = new ResourceProxyImpl(getApplicationContext());

到

mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext());

这至少可以让你使用默认图标。

修改

这应该将地图放在利物浦的NE中心，并在中心放置一个图标。

package osmdemo.demo; import java.util.ArrayList; import org.osmdroid.DefaultResourceProxyImpl; import org.osmdroid.ResourceProxy; import org.osmdroid.tileprovider.tilesource.TileSourceFactory; import org.osmdroid.util.GeoPoint; import org.osmdroid.views.MapController; import org.osmdroid.views.MapView; import org.osmdroid.views.overlay.ItemizedIconOverlay; import org.osmdroid.views.overlay.ItemizedOverlay; import org.osmdroid.views.overlay.OverlayItem; import org.osmdroid.views.util.constants.MapViewConstants; import android.app.Activity; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.widget.Toast; public class DemoMap extends Activity implements LocationListener, MapViewConstants { private MapView mMapView; private MapController mapController; private LocationManager mLocMgr; private ItemizedOverlay<OverlayItem> mMyLocationOverlay; private ResourceProxy mResourceProxy; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext()); setContentView(R.layout.copymain); mMapView = (MapView) this.findViewById(R.id.mapview); mMapView.setTileSource(TileSourceFactory.MAPNIK); mMapView.setBuiltInZoomControls(true); mMapView.setMultiTouchControls(true); mapController = this.mMapView.getController(); mapController.setZoom(15); GeoPoint point2 = new GeoPoint(53554070, -2959520); // centre map here GeoPoint point3 = new GeoPoint(53554070 + 1000, -2959520 + 1000); // icon goes here mapController.setCenter(point2); mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE); mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 100, this); ArrayList<OverlayItem> items = new ArrayList<OverlayItem>(); // Put overlay icon a little way from map centre items.add(new OverlayItem("Here", "SampleDescription", point3)); /* OnTapListener for the Markers, shows a simple Toast. */ this.mMyLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items, new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() { @Override public boolean onItemSingleTapUp(final int index, final OverlayItem item) { Toast.makeText( DemoMap.this, "Item '" + item.mTitle, Toast.LENGTH_LONG).show(); return true; // We 'handled' this event. } @Override public boolean onItemLongPress(final int index, final OverlayItem item) { Toast.makeText( DemoMap.this, "Item '" + item.mTitle ,Toast.LENGTH_LONG).show(); return false; } }, mResourceProxy); this.mMapView.getOverlays().add(this.mMyLocationOverlay); mMapView.invalidate(); } public void onLocationChanged(Location location) { int lat = (int) (location.getLatitude() * 1E6); int lng = (int) (location.getLongitude() * 1E6); GeoPoint gpt = new GeoPoint(lat, lng); mapController.setCenter(gpt); mMapView.invalidate(); } @Override public void onProviderDisabled(String arg0) {} @Override public void onProviderEnabled(String provider) {} @Override public void onStatusChanged(String provider, int status, Bundle extras) {} }

它有点粗糙和准备好了，但至少只运行3.0.4 jar和slf4j就可以了。希望它有所帮助。

编辑2

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="osmdemo.demo" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name="DemoMap" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="3" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> </manifest>

Answer 2

如果您要添加图标，则需要查看ItemizedOverlay类。您可以使用osmdroid的ItemizedIconOverlay，它是ItemizedOverlay的具体实现，或者您可以自己子类化ItemizedOverlay。看看样本，例如：

http://code.google.com/p/osmdroid/source/browse/trunk/OpenStreetMapViewer/src/org/osmdroid/samples/SampleWithMinimapItemizedoverlay.java

Answer 3

@rayman

还有一件事。当地图的位置发生变化时确实发生了变化，但Icon已经消失了。我如何验证图标进入新变化？ - rayman 2011年7月1日在7:12

这是您的位置更改

public void onLocationChanged(Location location) {
    int lat = (int) (location.getLatitude() * 1E6);
    int lng = (int) (location.getLongitude() * 1E6);
    GeoPoint gpt = new GeoPoint(lat, lng);
    mapController.setCenter(gpt);
    mMapView.invalidate();
}

但是你可以看到它没有在叠加层中添加新图标。

您应该清除以前的项目

items.clear()

（如果您希望在创建新图标时删除“旧”图标），然后将新点（gpt）添加到项目中。

items.add(new OverlayItem("Title", "Description", gpt));

依旧......

添加Overlay到OSMDROID

3 个答案: