content: package com.xiaochao.lcrapiddeveloplibrary.SmartTab.UtilsV4;
  
  import android.support.v4.util.SparseArrayCompat;
  import android.support.v4.view.PagerAdapter;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  import java.lang.ref.WeakReference;
  
  public class ViewPagerItemAdapter extends PagerAdapter {
  
    private final ViewPagerItems pages;
    private final SparseArrayCompat<WeakReference<View>> holder;
    private final LayoutInflater inflater;
  
    public ViewPagerItemAdapter(ViewPagerItems pages) {
      this.pages = pages;
      this.holder = new SparseArrayCompat<>(pages.size());
      this.inflater = LayoutInflater.from(pages.getContext());
    }
  
    @Override
    public int getCount() {
      return pages.size();
    }
  
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
      View view = getPagerItem(position).initiate(inflater, container);
      container.addView(view);
      holder.put(position, new WeakReference<View>(view));
      return view;
    }
  
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
      holder.remove(position);
      container.removeView((View) object);
    }
  
    @Override
    public boolean isViewFromObject(View view, Object object) {
      return object == view;
    }
  
    @Override
    public CharSequence getPageTitle(int position) {
      return getPagerItem(position).getTitle();
    }
  
    @Override
    public float getPageWidth(int position) {
      return getPagerItem(position).getWidth();
    }
  
    public View getPage(int position) {
      final WeakReference<View> weakRefItem = holder.get(position);
      return (weakRefItem != null) ? weakRefItem.get() : null;
    }
  
    protected ViewPagerItem getPagerItem(int position) {
      return pages.get(position);
    }
  }
  