class cast exception with custom gallery android

i'm trying to make a custom Gallery in my app. I created a class that extends Gallery but when i try to get the gallery from my xml i get a ClassCastException

Here is what i'm trying to do

 MyCustomGallery mcg = (MyCustomGallery )findViewById(R.id.gallery);;
 d.setAdapter(new MyAdapter(getApplicationContext(), images));

This is my custom gallery class

public class MyCustomGallery exten开发者_运维百科ds Gallery {

    public MyCustomGallery (Context context) {
        super(context);
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        return super.onFling(e1, e2, 100, 100);

    }
}

and this is my xml:

<Gallery android:id="@+id/gallery"
        android:background="#000000"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:spacing="20dp"
    />

what i'm i doing wrong?

Thanks in advance.

You have declared it as a plain Gallery in your xml, you need to declare it as your custom gallery.

<com.yourPackage.MyCustomGallery android:id="@+id/gallery"
        android:background="#000000"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:spacing="20dp"
    />

Note that you must include the full package name in the declaration inside your xml or it will not work properly.