设计仅包含图标的支持库选项卡

Question

我正在使用设计支持库来创建选项卡。默认情况下，它会创建带有文本的选项卡。如何创建只有图标的选项卡？如果它是当前选定的选项卡，我还想更改图标颜色。

Answer 1

我不知道直接的方法。但是通过文档我注意到你可以设置一个 Tab's icon with setIcon()

所以也许你会这样做：

for (int i = 0; i < mTabLayout.getTabCount(); i++) {
  mTabLayout.getTabAt(i).setIcon(R.drawable.icon);
}

您似乎也可以在选项卡上执行 setCustomView()。做这样的事情：

for (int i = 0; i < mTabLayout.getTabCount(); i++) {
  View v = inflater.inflate(view, parent, false);
  ((ImageView) v).setImageResource(R.drawable.icon);
  mTabLayout.getTabAt(i).setCustomView(v);
}

Answer 2

您可以 return 在视图寻呼机适配器中清空标题，或者如果您需要重复使用适配器，只需按照如下所示将标题设置为空来设置图标：

 for (int i = 0; i < mTabLayout.getTabCount(); i++) {
                    TabLayout.Tab tab = mTabLayout.getTabAt(i);
                    tab.setIcon(R.drawable.icon);
                    tab.setText("");
                }

Answer 3

您可以通过使用 SpannableString 并向其添加 ImageSpan 来获得 "icon only" 效果。参见：How can i develop the PagerSlidingTabStrip with images in android?

Answer 4

使用它来填充 viewPager：

public class SectionPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return mFragmentA;
            case 1:
                return mFragmentB;
            case 2:
                return mFragmentC;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return ""; // This removes the title, as you wish
    }
}

然后在 onCreateView 中：

final TabLayout tabLayout = (TabLayout) v.findViewById(R.id.tab_layout);
final ViewPager viewPager = (ViewPager) v.findViewById(R.id.view_pager);

viewPager.setAdapter(new SectionPagerAdapter(getActivity().getSupportFragmentManager()));
tabLayout.setupWithViewPager(viewPager);

也方便知道：

for (int i = 0; i < tabLayout.getTabCount(); i++) {
    int iconId = -1;
    switch (i) {
        case 0:
            iconId = R.drawable.icon1;
            break;
        case 1:
            iconId = R.drawable.icon2;
            break;
        case 2:
            iconId = R.drawable.icon3;
            break;
    }
    tabLayout.getTabAt(i).setIcon(iconId);
}

// Needed since support libraries version 23.0.0 
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
       tabLayout.getTabAt(position).select();
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }

});

tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        super.onTabSelected(tab);
    }
});

并更改所选选项卡的颜色：

   tabLayout.setSelectedTabIndicatorColor(colorId); // For the line
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        for (int i = 0; i < tabLayout.getTabCount(); i++) {
            tabLayout.getTabAt(i).getIcon().setTint(getResources().getColor(R.color.gray));
        }
        tabLayout.getTabAt(selectedTabPosition).getIcon().setTint(colorId);
    }

设计仅包含图标的支持库选项卡

Design support library tabs with only icons

tabs

android

android-tablayout