在扩展Activity和扩展AndroidApplication之间

Question

我想打电话

public class main3D extends  AndroidApplication  {
        public void onCreate (android.os.Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                initialize(new genarate3D(), false);
        }

}

这个班级

public class mainPage extends Activity
{
    private ImageView mHome;
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_page);

        mHome = (ImageView) findViewById(R.id.imgVtownHome);
        mHome.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent i = new Intent(mainPage.this, main3D.class);
                startActivity(i);
            }
        });

    }

但有错误

09-28 08:38:56.886: E/AndroidRuntime(24439): FATAL EXCEPTION: main

09-28 08:38:56.886: E/AndroidRuntime(24439): java.lang.NoClassDefFoundError: com.qualcomm.QCARSamples.ImageTargets.main3D

09-28 08:38:56.886: E/AndroidRuntime(24439): at com.qualcomm.QCARSamples.ImageTargets.mainPage$1.onClick(mainPage.java:24)

我该如何解决这个问题？ 谢谢。