带有自动滚动Android的Viewpager

我正在使用viewpager库来实现图像滑块，但不知道如何实现它来自动滚动。这是我的代码。

ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentPagerAdapter implements IconPagerAdapter{

private int[] Images = new int[] { R.drawable.viewpager, R.drawable.viewpager,
        R.drawable.viewpager, R.drawable.viewpager,R.drawable.viewpager, R.drawable.viewpager

};

protected static final int[] ICONS = new int[] { R.drawable.logo,
        R.drawable.logo, R.drawable.logo, R.drawable.logo,R.drawable.logo, R.drawable.logo };

private int mCount = Images.length;

public ViewPagerAdapter(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int position) {
    return new SliderFragment(Images[position]);
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return mCount;
}

public int getIconResId(int index) {
    return ICONS[index % ICONS.length];
}

public void setCount(int count) {
    if (count > 0 && count <= 10) {
        mCount = count;
        notifyDataSetChanged();
    }
}

}

SliderFragment.java

public class SliderFragment extends SherlockFragment {

int imageResourceId;

public SliderFragment(int i) {
    imageResourceId = i;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    ImageView image = new ImageView(getActivity());
    image.setImageResource(imageResourceId);

    LinearLayout layout = new LinearLayout(getActivity());
    layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
            LayoutParams.MATCH_PARENT));

    layout.setGravity(Gravity.CENTER);
    layout.addView(image);

    return layout;
}

}

MainActivity.java

mAdapter = new ViewPagerAdapter(getSupportFragmentManager());
    vPager = (ViewPager) findViewById(R.id.pager);
    pIndicator = (PageIndicator) findViewById(R.id.indicator);
    vPager.setAdapter(mAdapter);
    pIndicator.setViewPager(vPager);
    ((CirclePageIndicator) pIndicator).setSnap(true);

请指导我如何使用自动滚动实现它，以便图像在预定义的时间后自动滚动。