둥글게...는 크기를 조절해서 표현이 가능합니다.
그래서 크기를 조절하는 부분만 구현해봤습니다.
이건  APIDemo의 소스를 수정한 넘입니다.

package com.example.android.apis.view;
import com.example.android.apis.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;

public class ImageSwitcher1 extends Activity implements
        AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory {
 public int selectedIndex = -1;
 ImageAdapter ia;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.image_switcher_1);
        mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
        mSwitcher.setFactory(this);
        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));
        ia = new ImageAdapter(this);
        Gallery g = (Gallery) findViewById(R.id.gallery);
        g.setCallbackDuringFling(true);
        g.setAdapter(ia);
        g.setOnItemSelectedListener(this);
        
    }
    public void onItemSelected(AdapterView parent, View v, int position, long id) {
        mSwitcher.setImageResource(mImageIds[position]);
        ia.setSelectedPosition(position);
        ia.notifyDataSetChanged();
    }
    public void onNothingSelected(AdapterView parent) {
     
    }
    public View makeView() {
        ImageView i = new ImageView(this);
        i.setBackgroundColor(0xFF000000);
        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.FILL_PARENT));
        return i;
    }
    private ImageSwitcher mSwitcher;
    public class ImageAdapter extends BaseAdapter {
     int mSelectedPosition = -1;
     
        public ImageAdapter(Context c) {
            mContext = c;
        }
        public int getCount() {
            return mThumbIds.length;
        }
        public Object getItem(int position) {
            return position;
        }
        public long getItemId(int position) {
            return position;
        }
        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView = new ImageView(mContext);
            
            imageView.setImageResource(mThumbIds[position]);
            imageView.setAdjustViewBounds(false);
            
            if(position == mSelectedPosition){
             imageView.setLayoutParams(new Gallery.LayoutParams(
                     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            }else if(Math.abs(position-mSelectedPosition)==1 && mSelectedPosition!=-1){
             imageView.setLayoutParams(new Gallery.LayoutParams(
                     20, 20));
            }else if(mSelectedPosition!=-1){
             imageView.setLayoutParams(new Gallery.LayoutParams(
                     10, 10));
            }else{
             imageView.setLayoutParams(new Gallery.LayoutParams(
                     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            }
            imageView.setBackgroundResource(R.drawable.picture_frame);
            
            
            return imageView;
        }
        private Context mContext;
        public void setSelectedPosition(int p){
         mSelectedPosition = p;
        }
    }
    private Integer[] mThumbIds = {
            R.drawable.sample_thumb_0, R.drawable.sample_thumb_1,
            R.drawable.sample_thumb_2, R.drawable.sample_thumb_3,
            R.drawable.sample_thumb_4, R.drawable.sample_thumb_5,
            R.drawable.sample_thumb_6, R.drawable.sample_thumb_7};
    private Integer[] mImageIds = {
            R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2,
            R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7};
}

화면에 몇개 표시할건가를 정하셔야 할거구요...
그리고 가운데 것만 크게 할 것이기 때문에 화면 크기를 놓고 "작도" 해보시는게 나을겁니다.
크기가 결정 되면 getView의 if문에서 크기를 조절하시면 됩니다.