Я выяснил это сам ... видимо, это какой-то большой секрет или что-то в этом роде ...
в любом случае, наслаждайтесь кодом. Счастливо скопируйте и вставьте его по сети, чтобы раскрыть секрет.
package myjunk.android.gps;
import java.util.List;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.RemoteException;
import android.util.Log;
import android.widget.Toast;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
public class ActivityMap extends MapActivity
{
//member variables
private static final String TAG = "MyMapActivity";
private MapView mapView;
private MapController mapController;
private float mFloatMyLat;
private float mFloatMyLon;
private float mFloatOtherPersonLat;
private float mFloatOtherPersonLon;
private List<Overlay> mapOverlays;
private Drawable drawable;
private MapItemizedOverlay itemizedOverlay;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
mapView = (MapView) findViewById(R.id.map);
mapController = mapView.getController();
//zoom to street level showing a few blocks
//1 is world view, 21 is the tightest zoom possible
mapController.setZoom(17);
//mapView.setSatellite(true);//show satellite view
mapView.setStreetView(false);//setting this to true causes blue lines around roads
mapView.invalidate();
mapOverlays = mapView.getOverlays();
drawable = this.getResources().getDrawable(R.drawable.androidmarker);
Bundle extras = getIntent().getExtras();
if (extras != null)
{
//Get starting locations passed in by previous Activity
mStrNickname = extras.getString("NickName");
mFloatMyLat = extras.getFloat("MyLat");
mFloatMyLon = extras.getFloat("MyLon");
mFloatOtherPersonLat = extras.getFloat("OthersLat");
mFloatOtherPersonLon = extras.getFloat("OthersLon");
}
itemizedOverlay = new MapItemizedOverlay(drawable, this, 30);//text size: 30
//put my location on the map
GeoPoint gPointMe = new GeoPoint((int)(mFloatMyLat * 1000000),(int)(mFloatMyLon * 1000000));
OverlayItem overlayItem = new OverlayItem(gPointMe, "Me", "This is my location");
itemizedOverlay.addOverlay(overlayItem);
//show other person on map
GeoPoint gPoint = new GeoPoint((int)(mFloatOtherPersonLat * 1000000),(int)(mFloatOtherPersonLon * 1000000));
overlayItem = new OverlayItem(gPoint, mStrNickname, "This is that person's location");
itemizedOverlay.addOverlay(overlayItem);
//add overlay items to master list of overlays
mapOverlays.add(itemizedOverlay);
mapView.invalidate();
mapView.setBuiltInZoomControls(true);
//move map over to my position
mapController.animateTo(gPointMe);
}
@Override
protected boolean isRouteDisplayed()
{
return false;
}
}
package myjunk.android.gps;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
public class MapItemizedOverlay extends ItemizedOverlay<OverlayItem>
{
//member variables
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
private int mTextSize;
public MapItemizedOverlay(Drawable defaultMarker, Context context, int textSize)
{
super(boundCenterBottom(defaultMarker));
mContext = context;
mTextSize = textSize;
}
//In order for the populate() method to read each OverlayItem, it will make a request to createItem(int)
// define this method to properly read from our ArrayList
@Override
protected OverlayItem createItem(int i)
{
return mOverlays.get(i);
}
@Override
public int size()
{
return mOverlays.size();
}
@Override
protected boolean onTap(int index)
{
OverlayItem item = mOverlays.get(index);
//Do stuff here when you tap, i.e. :
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
//return true to indicate we've taken care of it
return true;
}
@Override
public void draw(android.graphics.Canvas canvas, MapView mapView, boolean shadow)
{
super.draw(canvas, mapView, shadow);
if (shadow == false)
{
//cycle through all overlays
for (int index = 0; index < mOverlays.size(); index++)
{
OverlayItem item = mOverlays.get(index);
// Converts lat/lng-Point to coordinates on the screen
GeoPoint point = item.getPoint();
Point ptScreenCoord = new Point() ;
mapView.getProjection().toPixels(point, ptScreenCoord);
//Paint
Paint paint = new Paint();
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(mTextSize);
paint.setARGB(150, 0, 0, 0); // alpha, r, g, b (Black, semi see-through)
//show text to the right of the icon
canvas.drawText(item.getTitle(), ptScreenCoord.x, ptScreenCoord.y+mTextSize, paint);
}
}
}
public void addOverlay(OverlayItem overlay)
{
mOverlays.add(overlay);
populate();
}
public void removeOverlay(OverlayItem overlay)
{
mOverlays.remove(overlay);
populate();
}
public void clear()
{
mOverlays.clear();
populate();
}
}