Android ViewPager实现软件的第一次加载的滑动效果

public class MainActivity extends Activity { private ViewPager viewPager;
private List<View> Views;
private ImageView[] imgs;
private ViewGroup main,group;
private ImageView img;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState); Views=new ArrayList<View>();
main=(ViewGroup) View.inflate(this,R.layout.main, null); viewPager=(ViewPager) main.findViewById(R.id.viewpager);
group=(ViewGroup) main.findViewById(R.id.viewgroup); View view1=View.inflate(this, R.layout.item0, null);
View view2=View.inflate(this, R.layout.item1, null);
View view3=View.inflate(this, R.layout.item2, null);
View view4=View.inflate(this, R.layout.item4, null); Views.add(view4);
Views.add(view3);
Views.add(view2);
Views.add(view1); imgs=new ImageView[Views.size()]; for(int i=0;i<Views.size();i++)
{
img=new ImageView(this);
img.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
img.setPadding(10, 10, 10, 10);
if(i==0)
{
img.setImageResource(R.drawable.white);
}else
{
img.setImageResource(R.drawable.black);
}
group.addView(img);
imgs[i]=img;
} setContentView(main);
//添加数据
viewPager.setAdapter(new MyAdapter());
//监听滑动效果
viewPager.setOnPageChangeListener(new OnPageChangeListener()
{
public void onPageSelected(int arg0)
{
for(int i=0;i<Views.size();i++)
{
if(arg0!=i)
{
imgs[i].setImageResource(R.drawable.black);
}else
{
imgs[i].setImageResource(R.drawable.white);
}
} } @Override
public void onPageScrolled(int arg0, float arg1, int arg2){ }
public void onPageScrollStateChanged(int arg0){}
});
} class MyAdapter extends PagerAdapter
{ @Override
public int getCount() {
return Views.size();
} @Override
public boolean isViewFromObject(View arg0, Object arg1)
{
return arg0==arg1;
} @Override
public int getItemPosition(Object object)
{
return super.getItemPosition(object);
} 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"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" > <android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="fill_parent"
android:layout_height="wrap_content" /> <RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" > <LinearLayout
android:id="@+id/viewgroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="30dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
</LinearLayout>
</RelativeLayout> </FrameLayout>