Android TabLayout未在棉花糖上显示选项卡标题

当我在棉花糖设备上测试我的应用程序时，我的标签标题出现了一个奇怪的问题。当我在所有其他设备上测试它时，标题显示得很好。在调试时，设备会点击所有相同的点，包括我的适配器中的“getPageTitle”方法。我已经阅读了很多关于使用android的TabLayout和ViewPager的教程，只是为了确保我没有遗漏任何东西，而且从我所能说的来看，我没有做错任何事情

这是我主要活动中的代码

// setup viewPager
final ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
setupViewPager(viewPager);

// setup tabLayout
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

我的setUpViewPager（）方法

还有我的适配器类，它扩展了FragmentPagerAdapter

private class ViewPagerAdapter extends FragmentPagerAdapter {
    private static final int NUM_FRAGMENTS = 2;

    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0: return AllFeaturesFragment.newInstance();
            case 1: return CategoriesFragment.newInstance();
        }
        return null;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0: return "All Features";
            case 1: return "Categories";
        }
        return null;
    }

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

非常感谢您的帮助

编辑

---

我从未想过要检查xml文件以获得答案，但我在TabLayout元素上使用了一种样式，其父样式是“Widget.AppCompat.Toolbar”。出于某种原因，这种风格使标题在棉花糖设备上看不见，而在其他设备上看不见。我所要做的就是去掉这个样式，它工作得很好

我也面临同样的问题。问题是，当您在寻呼机适配器内硬编码选项卡平铺时，支持库中存在一些问题。我像这样更换了寻呼机适配器

 class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

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

public class MainActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

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

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new OneFragment(), "ONE");
    adapter.addFragment(new TwoFragment(), "TWO");
    adapter.addFragment(new ThreeFragment(), "THREE");
    viewPager.setAdapter(adapter);
}
}

---

我也面临同样的问题。问题是，当您在寻呼机适配器内硬编码选项卡平铺时，支持库中存在一些问题。我像这样更换了寻呼机适配器

 class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

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

public class MainActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

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

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new OneFragment(), "ONE");
    adapter.addFragment(new TwoFragment(), "TWO");
    adapter.addFragment(new ThreeFragment(), "THREE");
    viewPager.setAdapter(adapter);
}
}

替换

tabLayout.setupWithViewPager(viewPager);

与

替换

tabLayout.setupWithViewPager(viewPager);

与

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尝试为您的TableAyout提供其他tabtextcolor。这可能会有所帮助。尝试为您的TableAyout提供其他tabtextcolor。这可能会有所帮助。您能解释一下吗？为什么？你能解释一下吗？为什么？用这种方法，我失去了图标，现在我有了标题。我需要两个图标和标题使用这种方法，我失去了图标，现在我有了标题。我需要图标和标题