TabLayout的标签不显示 [英] Tabs of TabLayout not showing

问题描述

我有一个主要活动，它承载的片段，这反过来又举办TabLayout（带ViewPager）。标签栏所示，baut标签本身未示出。

I have a main activity, which hosts a fragment, which in turn hosts a TabLayout (with a ViewPager). The tab bar is shown, baut the tabs themselves are not shown.

下面是主要的活动我的code，用于显示主机片段：

Here is my code in the main activity for displaying the host fragment:

        Fragment fragment = new BMITabsFragment();

        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).addToBackStack(Constants.BMI_TABS_FRAGMENT).commit();

下面是我的它承载的TabLayout，这是BMITabsFragment的片段（S.A。）：

Here is my the Fragment which hosts the TabLayout, which is BMITabsFragment (s.a.):

public class BMITabsFragment extends Fragment {
...
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
        mParam1 = getArguments().getString(ARG_PARAM1);
        mParam2 = getArguments().getString(ARG_PARAM2);
    }

}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    // Get the ViewPager and set it's PagerAdapter so that it can display items
    ViewPager viewPager = (ViewPager) view.findViewById(R.id.viewpager);
    viewPager.setAdapter(new BMIFragmentPagerAdapter(getActivity().getSupportFragmentManager(),
            getActivity()));

    // Give the TabLayout the ViewPager
    TabLayout tabLayout = (TabLayout) view.findViewById(R.id.sliding_tabs);
    tabLayout.setupWithViewPager(viewPager);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_bmitabs, container, false);
    return view;
}
...
}

这是我的FragmentPagerAdapter：

This is my FragmentPagerAdapter:

public class BMIFragmentPagerAdapter extends FragmentPagerAdapter {

final int PAGE_COUNT = 2;
private FragmentManager fragmentManager;
private Context context;

public BMIFragmentPagerAdapter(FragmentManager fm, Context context) {
    super(fm);
    this.context = context;
    this.fragmentManager = fm;

}

public BMIFragmentPagerAdapter(FragmentManager fm) {
    super(fm);
    fragmentManager = fm;

}

@Override
public CharSequence getPageTitle(int position) {
    String[] pageTitles = context.getResources().getStringArray(R.array.page_titles_array);
    return pageTitles[position];
}

@Override
public Fragment getItem(int position) {
    SharedPreferences prefs = context.getSharedPreferences(Constants.SHARED_PREFS_FILE, 0);
    long patientId = prefs.getLong(Constants.SELECTED_PATIENT_ID, 1);
    Fragment fragment = null;
    switch (position){
        case 0:
            return BMITabelleFragment.newInstance(patientId);

        case 1:
            return BMIChartFragment.newInstance(patientId);

        default:
            return BMITabelleFragment.newInstance(patientId);
    }
}

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

这是fragment_bmitabs.xml：

And this is the fragment_bmitabs.xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.TabLayout
    android:id="@+id/sliding_tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabMode="scrollable" />

<android.support.v4.view.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="0px"
    android:layout_weight="1"
    android:background="@android:color/white" />

</LinearLayout>

我的code是基于谷歌Android指南：<一href=\"https://github.com/$c$cpath/android_guides/wiki/Google-Play-Style-Tabs-using-TabLayout\">https://github.com/$c$cpath/android_guides/wiki/Google-Play-Style-Tabs-using-TabLayout

我是缺少在这里？

请注意：我使用AppCompatActivity和支持库V4和放大器; V7和COM：机器人：支持：设计库

Note: I am using AppCompatActivity and the support libraries v4 & v7 and the com:android:support:design library

推荐答案

我有同样的问题！
但是，这也解决了我。

I have the same problem! But this fix too me.

tabLayout.post(new Runnable() {
    @Override
    public void run() {
        tabLayout.setupWithViewPager(viewPager);
    }
});

<一个href=\"https://$c$c.google.com/p/android/issues/detail?id=180462\">https://$c$c.google.com/p/android/issues/detail?id=180462

这篇关于TabLayout的标签不显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！