FragmentTabHost未在Android中的Fragment内部创建视图 [英] FragmentTabHost not creating view inside Fragment in android

问题描述

我在使视图在Tabhost上更改时遇到问题-当我选择一个选项卡时，内容保持空白。

I am having an issue getting the view to change on a tabhost - when I select a tab the content stays blank.

据我所知， onCreateView 不在子片段上被调用。 onMenuCreate 可以正常运行，因为菜单应该按照预期进行更改。

From what I can tell, onCreateView is not being called on the child Fragments. onMenuCreate runs fine because the menu changes like it is supposed to.

   public class PatientTabFragment extends Fragment {
    private FragmentTabHost mTabHost;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mTabHost = new FragmentTabHost(getActivity());
        mTabHost.setup(getActivity(), getChildFragmentManager());

        mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Info"),
                NewPatientFragment.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("Notes"),
                NoteListFragment.class, null);


        return mTabHost;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mTabHost = null;
    }
}

推荐答案

到文档：

特殊的TabHost，允许将Fragment对象用于其Tab
的内容。将其放置在视图层次结构中时， 在扩大
层次结构后，必须将setup（Context，FragmentManager，int）调用为
以完成选项卡宿主的初始化。

Special TabHost that allows the use of Fragment objects for its tab content. When placing this in a view hierarchy, after inflating the hierarchy you must call setup(Context, FragmentManager, int) to complete the initialization of the tab host.

（强调我的意思）

所以我建议像这样：

   public class PatientTabFragment extends Fragment {
    private FragmentTabHost mTabHost;
    private boolean createdTab = false;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mTabHost = new FragmentTabHost(getActivity());
        mTabHost.setup(getActivity(), getChildFragmentManager());

        mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Info"),
                NewPatientFragment.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("Notes"),
                NoteListFragment.class, null);


        return mTabHost;
    }

    public void onResume(){
        if (!createdTab){
          createdTab = true;
          mTabHost.setup(getActivity(), getActivity().
                         getSupportedFragmentManager());
        }
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mTabHost = null;
    }
}

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