Android自定义控件实现简单的轮播图控件

public class CarouselView extends FrameLayout implements ViewPager.OnPageChangeListener {

  private Context context;

  private int totalCount =100;//总数，这是为实现无限滑动设置的

  private int showCount;//要显示的轮播图数量

  private int currentPosition =0;//当前ViewPager的位置

  private ViewPager viewPager;

  private LinearLayout carouselLayout;//展示指示器的布局

  private Adapter adapter;
  private int pageItemWidth;//每个指示器的宽度
  private boolean isUserTouched = false;

  public CarouselView(Context context) {
    super(context);
    this.cOntext= context;
  }

  public CarouselView(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.cOntext= context;
  }

  public CarouselView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.cOntext= context;
  }
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>

@Override
  protected void onFinishInflate() {
    super.onFinishInflate();
    View view = LayoutInflater.from(context).inflate(R.layout.carousel_layout,null);
    this.viewPager = (ViewPager) view.findViewById(R.id.gallery);
    this.carouselLayout = (LinearLayout)view.findViewById(R.id.CarouselLayoutPage);
    pageItemWidth = ConvertUtils.dip2px(context,5);
    this.viewPager.addOnPageChangeListener(this);
    addView(view);
  }

//定义一个接口让外部设置展示的View
public interface Adapter{
    boolean isEmpty();
    View getView(int position);
    int getCount();
  }
//ViewPager的适配器
class ViewPagerAdapter extends PagerAdapter {

    @Override
    public int getCount() {
      return totalCount;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
      return view==object;
    }

    @Override
    public Object isViewFromObject(ViewGroup container, int position) {
      position %= showCount;
      //调用接口的getView()获取使用者要展示的View;
      View view = adapter.getView(position);
      container.addView(view);
      return view;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
      container.removeView((View) object);
    }

    @Override
    public int getItemPosition(Object object) {
      return super.getItemPosition(object);
    }

    @Override
    public void finishUpdate(ViewGroup container) {
      super.finishUpdate(container);

      int position = viewPager.getCurrentItem();
      //实现Viewpager到第一页的实现能向左滑动
      if (position==0){
        position=showCount;
        viewPager.setCurrentItem(position,false);

      }else if (position==totalCount-1){//ViewPager到最后一页的实现向又滑动
        position = showCount - 1;
        viewPager.setCurrentItem(position,false);
      }
    }
  }
//为外部提供设置数据源的方法,同时为ViewPager做展示
public void setAdapter(Adapter adapter){
    this.adapter = adapter;
    if (adapter!=null){
      init();
    }
  }

private void init() {
    viewPager.setAdapter(null);
    carouselLayout.removeAllViews();//清空之前的数据
    if (adapter.isEmpty()){
      return;
    }
    int count = adapter.getCount();
    showCount = adapter.getCount();
    for (int i=0;i

 CarouselView carouselView = (CarouselView) findViewById(R.id.CarouselView);
  carouselView.setAdapter(new CarouselView.Adapter() {
   @Override
   public boolean isEmpty() {
    return false;
   }

   @Override
   public View getView(int position) {
    View view = mInflater.inflate(R.layout.item,null);
    ImageView imageView = (ImageView) view.findViewById(R.id.image);
    imageView.setImageResource(mImagesSrc[position]);
    return view;
   }

   @Override
   public int getCount() {
    return mImagesSrc.length;
   }
  });