android - 内 View 分页器的实现

Question

我已经在另一个内部实现了一个 View 寻呼机。要求是在父 View 寻呼机上有标签，并在 subview 寻呼机上显示其项目。例如，父 View 寻呼机有两个选项卡(剧集、视频)，我们有需要在各个选项卡中显示的剧集和视频( subview 寻呼机)的数量。问题是当我从屏幕边缘滑动时，即使当前选项卡有更多要加载的项目，它也会更改选项卡。但是，当我从屏幕中心滑动并在剧集选项卡上显示下一集时，它工作正常。

这是一个代码:

public class ParentPagerAdapter extends FragmentStatePagerAdapter {

  private List<String> tabList;
  private boolean isPilot;
  private ArrayList<?extends IVideoModel> videoList;
  private ArrayList<?extends IEpisodeAndVideoModel> episodeList;

  public ParentPagerAdapter(FragmentManager fm, List<String> tabList,
      ArrayList<?extends IEpisodeModel> episodeList, ArrayList<?extends IVideoModel>
      videoList) {
    super(fm);
    this.episodeList = episodeList;
    this.videoList = videoList;
    this.tabList = tabList;
  }

  @Override
  public Fragment getItem(int position) {
    Fragment fragment;
    Bundle bundle = new Bundle();
    if(tabList.get(position).contains(VIDEOS_TAB_TITLE)){
      fragment = new VideoTabFragment();
      return fragment;
    }else if(tabList.get(position).contains(EPISODES_TAB_TITLE)){
      fragment = new EpisodeTabFragment();
      return fragment;
    }
    return null;
  }

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

  @Override
  public CharSequence getPageTitle(int position) {
    return tabList.get(position);
  }

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

subview 寻呼机 1:

public class ProjectVideoPagerAdapter extends PagerAdapter {
  public final String TAG = ProjectVideoPagerAdapter.class.getCanonicalName();
  private Context mContext;
  private LayoutInflater mLayoutInflator;
  private RowProjectLandingPagerItemBinding itemBinding;
  private List<? extends IVideoModel> projectVideoList;

  public ProjectVideoPagerAdapter(Context context, List<? extends IVideoModel> projectVideoList) {
    mContext = context;
    this.projectVideoList = projectVideoList;
    mLayoutInflator = ((LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE));
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    debugLog("Entering instantiateItem with position = " + position);
    itemBinding =
        DataBindingUtil.inflate(mLayoutInflator, R.layout.row_project_landing_pager_item, null,
            false);
    if (projectVideoList == null) return null;

    container.addView(itemBinding.getRoot());
    debugLog("Exiting instantiateItem()");
    return itemBinding.getRoot();
  }

  @Override
  public int getCount() {
    if (projectVideoList != null && !projectVideoList.isEmpty()) return projectVideoList.size();
    return 0;
  }

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

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

subview 寻呼机 2:

public class ProjectVideoPagerAdapter extends PagerAdapter {
  public final String TAG = ProjectVideoPagerAdapter.class.getCanonicalName();
  private Context mContext;
  private LayoutInflater mLayoutInflator;
  private RowProjectLandingPagerItemBinding itemBinding;
  private List<? extends IEpisodeModel> projectEpisodeList;

  public ProjectVideoPagerAdapter(Context context, List<? extends IEpisodeModel> projectList) {
    mContext = context;
    this.projectEpisodeList = projectList;
    mLayoutInflator = ((LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE));
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    debugLog("Entering instantiateItem with position = " + position);
    itemBinding =
        DataBindingUtil.inflate(mLayoutInflator, R.layout.row_project_landing_pager_item, null,
            false);
    if (projectEpisodeList == null) return null;

    container.addView(itemBinding.getRoot());
    debugLog("Exiting instantiateItem()");
    return itemBinding.getRoot();
  }

  @Override
  public int getCount() {
    if (projectEpisodeList != null && !projectEpisodeList.isEmpty()) return projectEpisodeList.size();
    return 0;
  }

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

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

Answer 1

对于内部 View 寻呼机，您应该使用“childfragmentmanager”而不是“fragmentmanager”。它工作正常。