Gallery items overlapping (bleed in)

My probel is that images in my Gallery are bleeding in into each other once I begin scrolling towards the next image.

I am using a android.widget.Gallery connected to a custom adapter I extended from BaseAdapter.

The adapter's GetView() method is like this

public View getView(int position, View convertView, ViewGroup parent) {
            ImageView i = new ImageView(mContext);
            if (mImageBitmap != null && position < mImageBitmap.length)
             i.setImageBitmap(mImageBitmap[position]);
            return i;

}