ViewPager实现导航页

public class ViewPagerAdapter extends PagerAdapter{

     List<View> views; //用于放置导航页
      private Context context;
     
      public ViewPagerAdapter(List<View> views, Context context) {
            super();
            this. views = views;
            this. context = context;
     }

//   获取需要滑动的控件数量
      public int getCount() {
            // TODO Auto-generated method stub
            return views.size();
     }


//   判断是否是同一个元素
      public boolean isViewFromObject(View arg0, Object arg1) {
            // TODO Auto-generated method stub
            return arg0 == arg1;
     }
     
//   超出了缓存数量，销毁
      @Override
      public void destroyItem(View container, int position, Object object) {
            // TODO Auto-generated method stub
          ((ViewPager)container).removeView( views.get(position));
     }
     
//   初始化显示加载图片
      @Override
      public Object instantiateItem(View container, int position) {
           ((ViewPager)container).addView( views.get(position));
            return views.get(position);
     }
}

public class GuidePageActivity extends Activity implements OnPageChangeListener{


     private ViewPager viewPager;
     private List<View> views; //放置需要切换的页面
     private ViewPagerAdapter vpAdater; //适配器
     private int[] layoutIds; //切换页面的布局id
     private int[] dotsIds; //导航点的id
     private ImageView[] dots; //导航点集合
     private Button enterButton;
     
     protected void onCreate (Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
           requestWindowFeature(Window. FEATURE_NO_TITLE); //隐藏标题
           setContentView(R.layout. guide);
          getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN,
                     WindowManager.LayoutParams. FLAG_FULLSCREEN); //设置全屏
           initViews(); //初始化组件
     }
     
     void initViews(){
           LayoutInflater inflater = LayoutInflater. from(this);
            layoutIds = new int[]{R.layout. scene1, R.layout.scene2, R.layout.scene3 ,
                     R.layout. scene4, R.layout. scene5};
            dotsIds = new int[]{R.id. dot_01, R.id. dot_02, R.id.dot_03,
                     R.id. dot_04, R.id. dot_05};
           
           
//         初始化views集合
            views = new ArrayList<View>();
            for( int i=0; i< layoutIds. length; i++){
                 views.add(inflater.inflate( layoutIds[i], null));
           }
           
//         初始化dots
            dots = new ImageView[ dotsIds. length];
            for( int i=0; i< dotsIds. length; i++){
                 dots[i] = (ImageView)findViewById( dotsIds[i]);
           }
           
            viewPager = (ViewPager)findViewById(R.id.guide_viewpager );
            vpAdater = new ViewPagerAdapter( views, this);
            viewPager.setAdapter( vpAdater); //为viewPager设置适配器
           
            //同时需要监听ViewPager滑动的情况，根据滑动的状态设置导航点
            viewPager.setOnPageChangeListener( this);
           
            enterButton = (Button)( views.get( views.size() - 1)).findViewById(R.id.enter_button );
            enterButton.setOnClickListener(
                      new OnClickListener() {
                            public void onClick(View v) {
                                 // TODO Auto-generated method stub
                                Intent intent = new Intent(GuidePageActivity.this , MainActivity.class);
                                startActivity(intent);
                                finish();
                           }
                     }
                     );
     }

     @Override
     public void onPageScrollStateChanged( int arg0) {
            // TODO Auto-generated method stub
           
     }

     @Override
     public void onPageScrolled( int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub
           
     }


     //根据选定的页面状态设置导航点
     public void onPageSelected( int arg0) {
            //选定arg0位置的页面
            for( int i=0; i< views.size(); i++){
                 if(i == arg0){
                      dots[i].setImageResource(R.drawable. dot_img_selected);
                }
                 else{
                      dots[i].setImageResource(R.drawable. dot_img);
                }
           }
     }
}