Android ViewPager 左右滑动2-1

public class PagerActivity extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initViewPager();
}

private void initViewPager()
{
ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);

View view1 = LayoutInflater.from(this).inflate(R.layout.index_1, null);
View view2 = LayoutInflater.from(this).inflate(R.layout.index_2, null);
View view3 = LayoutInflater.from(this).inflate(R.layout.index_3, null);

ArrayList<View> views = new ArrayList<View>();
views.add(view1);
views.add(view2);
views.add(view3);

MYPagerAdapter adapter = new MYPagerAdapter();
adapter.setViews(views);
viewPager.setAdapter(adapter);
}
}

public class MYPagerAdapter extends PagerAdapter
{
private ArrayList<View> views;

public void setViews(ArrayList<View> views)
{
this.views = views;
}

@Override
public int getCount()
{
return views.size();
}

@Override
public boolean isViewFromObject(View arg0, Object arg1)
{
return arg0 == arg1;
}

@Override
public void destroyItem(View container, int position, Object object)
{

((ViewPager) container).removeView(views.get(position));
}

@Override
public Object instantiateItem(View container, int position)
{
((ViewPager) container).addView(views.get(position));
return views.get(position);
}
}


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<requestFocus />
</android.support.v4.view.ViewPager>

</RelativeLayout>