Java 导入项目时出现NoClassDefException

我有一个问题，我正在做一个地图应用程序，我需要使用一些浮动菜单。我发现了一个非常好的例子，它发布在这个网站上（QuickAction）。但是当我将这个项目包含到我的项目的构建路径中时，我得到了一个NoClassDefError。这是我的日志

日志：

03-14 15:19:17.858: W/dalvikvm(1807): VFY: unable to find class referenced in signature (Lnet/londatiga/android/QuickAction;)
03-14 15:19:17.888: E/dalvikvm(1807): Could not find class 'net.londatiga.android.ActionItem', referenced from method com.gps.gpsclient.GPSClientActivity.createFloatingMenu
03-14 15:19:17.888: W/dalvikvm(1807): VFY: unable to resolve new-instance 646 (Lnet/londatiga/android/ActionItem;) in Lcom/gps/gpsclient/GPSClientActivity;
03-14 15:19:17.888: D/dalvikvm(1807): VFY: replacing opcode 0x22 at 0x0000
03-14 15:19:17.898: D/dalvikvm(1807): DexOpt: unable to opt direct call 0x0f95 at 0x02 in Lcom/gps/gpsclient/GPSClientActivity;.createFloatingMenu
03-14 15:19:17.908: D/dalvikvm(1807): DexOpt: unable to opt direct call 0x0f98 at 0x20 in Lcom/gps/gpsclient/GPSClientActivity;.createFloatingMenu
03-14 15:19:17.968: I/org.osmdroid.views.MapView(1807): Using tile source: org.osmdroid.tileprovider.tilesource.XYTileSource@410e7460
03-14 15:19:17.978: I/org.osmdroid.tileprovider.modules.MapTileFileStorageProviderBase(1807): sdcard state: mounted
03-14 15:19:17.978: I/org.osmdroid.tileprovider.modules.MapTileFileStorageProviderBase(1807): sdcard state: mounted
03-14 15:19:18.038: I/org.osmdroid.tileprovider.MapTileProviderBase(1807): rescale tile cache from 0 to 10
03-14 15:19:18.088: I/org.osmdroid.tileprovider.MapTileProviderBase(1807): Finished rescale in 44ms
03-14 15:19:18.098: D/dalvikvm(1807): GC_CONCURRENT freed 141K, 3% free 6877K/7047K, paused 2ms+7ms
03-14 15:19:18.128: D/dalvikvm(1807): GC_FOR_ALLOC freed 39K, 4% free 7144K/7431K, paused 28ms
03-14 15:19:18.258: D/dalvikvm(1807): GC_CONCURRENT freed 206K, 3% free 7467K/7687K, paused 2ms+3ms
03-14 15:19:18.258: D/AndroidRuntime(1807): Shutting down VM
03-14 15:19:18.268: I/dalvikvm(1807): threadid=3: reacting to signal 3
03-14 15:19:18.288: W/dalvikvm(1807): threadid=1: thread exiting with uncaught exception (group=0x40a671f8)
03-14 15:19:18.298: I/dalvikvm(1807): Wrote stack traces to '/data/anr/traces.txt'
03-14 15:19:18.298: E/AndroidRuntime(1807): FATAL EXCEPTION: main
03-14 15:19:18.298: E/AndroidRuntime(1807): java.lang.NoClassDefFoundError: net.londatiga.android.ActionItem
03-14 15:19:18.298: E/AndroidRuntime(1807):     at com.gps.gpsclient.GPSClientActivity.createFloatingMenu(GPSClientActivity.java:61)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at com.gps.gpsclient.GPSClientActivity.onCreate(GPSClientActivity.java:47)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.Activity.performCreate(Activity.java:4492)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.os.Looper.loop(Looper.java:137)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at android.app.ActivityThread.main(ActivityThread.java:4424)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at java.lang.reflect.Method.invokeNative(Native Method)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at java.lang.reflect.Method.invoke(Method.java:511)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-14 15:19:18.298: E/AndroidRuntime(1807):     at dalvik.system.NativeStart.main(Native Method)
03-14 15:19:18.558: D/dalvikvm(1807): GC_CONCURRENT freed 406K, 7% free 7450K/7943K, paused 3ms+2ms
03-14 15:19:18.768: I/dalvikvm(1807): threadid=3: reacting to signal 3
03-14 15:19:18.768: I/dalvikvm(1807): Wrote stack traces to '/data/anr/traces.txt'
03-14 15:19:18.888: I/dalvikvm(1807): threadid=3: reacting to signal 3
03-14 15:19:18.898: I/dalvikvm(1807): Wrote stack traces to '/data/anr/traces.txt'

我想这是对buildpath的一些思考，但这是我第一次将完整的项目包含到buildpath中，所以我没有这方面的经验。导入工作正常

活动：

package com.gps.gpsclient;



import net.londatiga.android.ActionItem;
import net.londatiga.android.QuickAction;

import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;



import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import org.osmdroid.views.MapView;


import com.gps.gpsclient.R;




public class GPSClientActivity extends Activity {

private MapView view;
private MapDrawer mainDrawer;
private QuickAction mQuickAction; 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gps);
        view = (MapView) findViewById(R.id.mapView);
        view.setTileSource(TileSourceFactory.MAPNIK);
        view.setBuiltInZoomControls(true);
        MapController mapController = view.getController();
        mapController.setZoom(10);
        GeoPoint point2 = new GeoPoint(51496994, -134733);
        mapController.setCenter(point2);
        mainDrawer=new MapDrawer(view);
        createFloatingMenu();
        final Button button = (Button) findViewById(R.id.addButton);
        button.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                mQuickAction.show(view);
                return false;
            }
        }); 

    }

    public void createFloatingMenu()
    {
        ActionItem item=new ActionItem();
        item.setIcon(getResources().getDrawable(R.drawable.ic_launcher));
        item.setTitle("Custom");
        mQuickAction =new QuickAction(view.getContext());
        mQuickAction.addActionItem(item);


    }


}

希望您能帮助清洁和建造

如果这没有帮助，那么重新启动eclipse并重新清理和构建

编辑：

你说：

.但当我将此项目包含到我的项目的构建路径中时，我会得到一个 诺卡斯特罗

您的生成路径中似乎包含一些库项目。您需要将此外部项目标记为库项目。为此，将项目导入工作区后，转到主项目。右键单击并转到属性。。然后选择左侧的“Android”组。在右侧窗格的最底部，您将看到一个Library面板。单击add，find，将另一个项目添加到其中，并将其标记为Library项目

完成此操作后，请清理构建并执行我前面所说的操作

如果这解决了您的问题，请将其标记为答案