Android中Viewpager嵌套在Viewpager中不显示布局

Question

我被指派创建一个非常不正常的布局，只能通过在另一个viewpager的第二个窗格中使用viewpager来完成，幸运的是，外部的viewpager需要被锁定，因此任务变得更加现实，然而出现了意外问题，即在内部viewpager加载后，onCreateView从未被调用过，我可以看到它在左右滑动，因此内部viewpager已经设置好了，但由于某种奇怪的原因它不会加载任何内部视图，请给予帮助，谢谢！

主要活动

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_fragment);

    pagePosition = 0;

    setupViews();

}

private void setupViews() {

    //setup images to be changed later

    ivCategory = (ImageView) findViewById(R.id.ivCatergory);
    ivHome = (ImageView) findViewById(R.id.ivHome);
    ivProfile = (ImageView) findViewById(R.id.ivProfile);

    //setup the viewpager
    pager = (CustomViewPager) findViewById(R.id.viewpager);

    //add fragments to the fragment array
    pageList.add(NavigationFragment.newInstance(0, getApplicationContext(), this));
    pageList.add(NavigationFragment.newInstance(1, getApplicationContext(), this));
    pageList.add(NavigationFragment.newInstance(0, getApplicationContext(), this));


    // initialize the page adapter
    pageAdapter = new FragmentHomeAdapter(getSupportFragmentManager(), pageList);

    //set the page adapter to the viewpager
    pager.setAdapter(pageAdapter);

    //set homepage to be first
    pager.setCurrentItem(1);


    //disable swiping to mimic iphone behaviour
    pager.setPagingEnabled(false);


}

viewpager

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    int pageType = getArguments().getInt(PAGE_TYPE);

    View v;


    if (pageType == 1) {//all inner fragments will happen here

        v = inflater.inflate(R.layout.fragment_container, container, false);

        //setup the inner viewpager
        pager = (CustomViewPager) v.findViewById(R.id.viewpager);

        pageList.add(HomeFragment.newInstance(0, context, getActivity()));
        pageList.add(HomeFragment.newInstance(1, context, getActivity()));

        // initialize the page adapter
        pageAdapter = new FragmentHomeAdapter(getActivity().getSupportFragmentManager(), pageList);

        //set the page adapter to the viewpager
        pager.setAdapter(pageAdapter);

        pager.setPagingEnabled(true);

    }


    return v;
}

内部ViewPager

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View v;

    v = inflater.inflate(R.layout.fragment_list_feed, container, false);

    lv = (ListView) v.findViewById(R.id.lvFeed);

    listAdapter = new ListHomeAdapter(getArguments().getInt(PAGE_TYPE), feedListItems, getActivity());

    //add header
    header = (ViewGroup) inflater.inflate(R.layout.list_item_header, lv, false);
    lv.addHeaderView(header, null, false);

    lv.setAdapter(listAdapter);

    if (getArguments().getInt(PAGE_TYPE) == 0) {

        new getFeedListItems().execute();

    } else {

        new getFeedListItems().execute();

    }

    Toast.makeText(context, "This never shows",
            Toast.LENGTH_SHORT).show();


    return v;
}

- Edmund Rojas

Answer 1

在另一个Fragment中显示Fragment时，请使用getChildFragmentManager()而不是getSupportFragmentManager()。

以这种方式初始化您的pageAdapter：

pageAdapter = new FragmentHomeAdapter(getChildFragmentManager(), pageList);

- Tiozao