在 Eclipse 中包含 Android-DirectionalViewPager .jar 时出错

Has somebody already used this library? I need some help :)

这是我的代码:

清单:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="own.vvp"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="7" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".MainActivity"
        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>

布局:

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<com.directionalviewpager.DirectionalViewPager
    android:id="@+id/pager"
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    />

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="2dp"
    android:orientation="horizontal">

    <Button
        android:id="@+id/horizontal"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_marginRight="1dp"
        android:text="Horizontal" />
    <Button
        android:id="@+id/vertical"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_marginLeft="1dp"
        android:text="Vertical" />

</LinearLayout>

</LinearLayout>

和主要活动:

package own.vvp;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.Button;
import com.directionalviewpager.DirectionalViewPager;


public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //Set up the pager
    final DirectionalViewPager pager = (DirectionalViewPager)findViewById(R.id.pager);
    pager.setAdapter(new TestFragmentAdapter(getSupportFragmentManager()));

    //Bind to control buttons
    ((Button)findViewById(R.id.horizontal)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            pager.setOrientation(DirectionalViewPager.HORIZONTAL);
        }
    });
    ((Button)findViewById(R.id.vertical)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            pager.setOrientation(DirectionalViewPager.VERTICAL);
        }
    });
}
}

和例子中的代码一样，除了包名和主activity的名字，所以我猜，我包含库的方式一定是错误的.