Impossible to instantiate an OsmDroid MapView

Question

I'm trying to use OSMdroid for a project, and i'm utterly unable to make the simplest code work. Well, a few days ago i was able to display maps and so on, and now i can't even instantiate a MapView. I reduced the code to its sipmlest form. I work with eclipse. I downloaded osmdroid-android-3.0.5.jar and slf4j-android-1.5.8.jar, and i included them in the project by adding lines to the classpath file

    <classpathentry kind="lib" path="lib/osmdroid-android-3.0.5.jar"/>
<classpathentry kind="lib" path="lib/slf4j-android-1.5.8.jar"/>

Or by right clicking on them then Build Path-> Add to build path (both gave the same result, anyway)

Then i typed this code:

import android.app.Activity;
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;

public class TestMapActivity extends Activity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        MapView mv=new MapView(this,256);

    }
}

And i get a bug when running it on the emulator:

04-17 09:10:31.181: E/AndroidRuntime(595): FATAL EXCEPTION: main
04-17 09:10:31.181: E/AndroidRuntime(595): java.lang.NoClassDefFoundError:           org.osmdroid.views.MapView
04-17 09:10:31.181: E/AndroidRuntime(595):  at     testmap.sagem.TestMapActivity.onCreate(TestMapActivity.java:17)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.Activity.performCreate(Activity.java:4465)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.os.Looper.loop(Looper.java:137)
04-17 09:10:31.181: E/AndroidRuntime(595):  at android.app.ActivityThread.main(ActivityThread.java:4424)
04-17 09:10:31.181: E/AndroidRuntime(595):  at java.lang.reflect.Method.invokeNative(Native Method)
04-17 09:10:31.181: E/AndroidRuntime(595):  at java.lang.reflect.Method.invoke(Method.java:511)
04-17 09:10:31.181: E/AndroidRuntime(595):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-17 09:10:31.181: E/AndroidRuntime(595):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-17 09:10:31.181: E/AndroidRuntime(595):  at dalvik.system.NativeStart.main(Native Method)

When i comment out the "MapView mv=new MapView(this,256);" it works, so i don't understand why the mapview can't be instantiated.

Any idea on this?

Thank you for your attention.

EDIT: The AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="testmap.sagem"
android:versionCode="1"
android:versionName="1.0" >
<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" />
<uses-sdk android:minSdkVersion="15" />
<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".TestMapActivity"
        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>

The main.xml file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
</LinearLayout>

Answer 1

Change Folder name "lib" to "libs" and put all jar files in that folder and Charge path of jar files to "libs" folder. I am not sure but I think it will work.