地图无法显示

Question

我一直收到错误，我认为我建议我引用多个地图。请指教。

import java.util.List;

import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;

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 PlacesMapActivity extends MapActivity {
// Nearest places
PlacesList nearPlaces;

// Map view
MapView mapView;

// Map overlay items
List<Overlay> mapOverlays;

AddItemizedOverlay itemizedOverlay;

GeoPoint geoPoint;
// Map controllers
MapController mc;

double latitude;
double longitude;
OverlayItem overlayitem;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.map_places);

    // Getting intent data
    Intent i = getIntent();

    // Users current geo location
    String user_latitude = i.getStringExtra("user_latitude");
    String user_longitude = i.getStringExtra("user_longitude");

    // Nearplaces list
    nearPlaces = (PlacesList) i.getSerializableExtra("near_places");

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.setBuiltInZoomControls(true);

    mapOverlays = mapView.getOverlays();

    // Geopoint to place on map
    geoPoint = new GeoPoint((int) (Double.parseDouble(user_latitude) * 1E6),
            (int) (Double.parseDouble(user_longitude) * 1E6));

    // Drawable marker icon
    Drawable drawable_user = this.getResources().getDrawable(R.drawable.mark_red);

    itemizedOverlay = new AddItemizedOverlay(drawable_user, this);

    // Map overlay item
    overlayitem = new OverlayItem(geoPoint, "Your Location",
            "That is you!");

    itemizedOverlay.addOverlay(overlayitem);

    mapOverlays.add(itemizedOverlay);
    itemizedOverlay.populateNow();

    // Drawable marker icon
    Drawable drawable = this.getResources()
            .getDrawable(R.drawable.mark_blue);

    itemizedOverlay = new AddItemizedOverlay(drawable, this);

    mc = mapView.getController();

    // These values are used to get map boundary area
    // The area where you can see all the markers on screen
    int minLat = Integer.MAX_VALUE;
    int minLong = Integer.MAX_VALUE;
    int maxLat = Integer.MIN_VALUE;
    int maxLong = Integer.MIN_VALUE;

    // check for null in case it is null
    if (nearPlaces.results != null) {
        // loop through all the places
        for (Place place : nearPlaces.results) {
            latitude = place.geometry.location.lat; // latitude
            longitude = place.geometry.location.lng; // longitude

            // Geopoint to place on map
            geoPoint = new GeoPoint((int) (latitude * 1E6),
                    (int) (longitude * 1E6));

            // Map overlay item
            overlayitem = new OverlayItem(geoPoint, place.name,
                    place.vicinity);

            itemizedOverlay.addOverlay(overlayitem);


            // calculating map boundary area
            minLat  = (int) Math.min( geoPoint.getLatitudeE6(), minLat );
            minLong = (int) Math.min( geoPoint.getLongitudeE6(), minLong);
            maxLat  = (int) Math.max( geoPoint.getLatitudeE6(), maxLat );
            maxLong = (int) Math.max( geoPoint.getLongitudeE6(), maxLong );
        }
        mapOverlays.add(itemizedOverlay);

        // showing all overlay items
        itemizedOverlay.populateNow();
    }

    // Adjusting the zoom level so that you can see all the markers on map
    mapView.getController().zoomToSpan(Math.abs( minLat - maxLat ), Math.abs( minLong - maxLong ));

    // Showing the center of the map
    mc.animateTo(new GeoPoint((maxLat + minLat)/2, (maxLong + minLong)/2 ));
    mapView.postInvalidate();

}

@Override
protected boolean isRouteDisplayed() {
    return false;
}

}

以下是错误日志：我不知道如何解决这个问题。我不认为我添加了多个地图引用。

    06-20 12:21:57.665    6675-6675/com.henry.eat E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NoClassDefFoundError: com/henry/eat/PlacesMapActivity
            at com.henry.eat.MainActivity$3.onClick(MainActivity.java:200)
             at android.view.View.performClick(View.java:4147)
           at android.view.View$PerformClick.run(View.java:17161)
            at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:213)
        at android.app.ActivityThread.main(ActivityThread.java:4787)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at                    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to     unexpected implementation
        at dalvik.system.DexFile.defineClass(Native Method)
        at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:211)
        at dalvik.system.DexPathList.findClass(DexPathList.java:315)
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:58)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:461)