Java 如何在Android中更改所选选项卡标题文本大小

我正在试图找到一种方法来更改选中时

选项卡标题的文本大小。直到现在都没有出口。希望有人能帮助我

我的代码如下：

XML:

还有我的旋转木马碎片类：

 public class CarouselFragment extends Fragment {

    private TabLayout tabLayout;
    private ViewPager viewPager;
    private ViewPagerAdapter viewPagerAdapter;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_carousel, container, false);
        tabLayout = (TabLayout)root.findViewById(R.id.tab_layout);
        viewPager = (ViewPager)root.findViewById(R.id.pager_view);
        setHasOptionsMenu(true);
        return root;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);


        viewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager(), getResources());
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
            viewPager.setAdapter(viewPagerAdapter);
            tabLayout.setSelectedTabIndicatorColor(Color.RED);
            tabLayout.setupWithViewPager(viewPager);
        }else {
            viewPager.setAdapter(viewPagerAdapter);
            tabLayout.setupWithViewPager(viewPager);
        }

        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
//here i should do something, but what???

            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
//here i should do something, but what???
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });
    }
}

非常感谢
 使用此代码

for (int i = 0; i < tabLayout.getTabCount(); i++) {

    TabLayout.Tab tab = tabLayout.getTabAt(i);
    if (tab != null) {

        TextView tabTextView = new TextView(this);
        tab.setCustomView(tabTextView);

        tabTextView.getLayoutParams().width = ViewGroup.LayoutParams.WRAP_CONTENT;
        tabTextView.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;

        tabTextView.setText(tab.getText());

        if (i == 0) {
            tabTextView.setTextSize(16);
        }

    }

}
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0);
        ViewGroup vgTab = (ViewGroup) vg.getChildAt(tab.getPosition());
        int tabChildsCount = vgTab.getChildCount();
        for (int i = 0; i < tabChildsCount; i++) {
            View tabViewChild = vgTab.getChildAt(i);
            if (tabViewChild instanceof TextView) {
                ((TextView) tabViewChild).setTextSize(16);
            }
        }
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {
        ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0);
        ViewGroup vgTab = (ViewGroup) vg.getChildAt(tab.getPosition());
        int tabChildsCount = vgTab.getChildCount();
        for (int i = 0; i < tabChildsCount; i++) {
            View tabViewChild = vgTab.getChildAt(i);
            if (tabViewChild instanceof TextView) {
                ((TextView) tabViewChild).setTextSize(14);
            }
        }
    }
}

for（int i=0；i
我建议设置自定义选项卡

首先，您需要启动自定义选项卡，否则它不会改变任何内容

使用
文本视图创建一个新布局（您可以在每个选项卡中添加任何您想要的内容）

在您的
on活动中，在
表格布局之后创建
。设置WithViewPager
启动自定义选项卡：

for (int i = 0; i < 3; i++) { // 3 - A+B+C in your example
    TabLayout.Tab tab = tabLayout.getTabAt(i);
    if (tab != null) {
        ViewGroup tabContainer = (ViewGroup) LayoutInflater.from(this).inflate(R.layout.custom_tab_item, tabLayout, false);
        if (tabContainer != null) {
            TextView yourTv = (TextView) tabContainer.findViewById(R.id.tv); 
            yourTv.setTextSize(18);
            tab.setCustomView(tabContainer);
        }
    }
}


您可以将自己的视图设置为表格布局的各个选项卡，也可以在选项卡选择中更改后者的大小-

以下是代码提示-

        TabLayout mTabLayout = (TabLayout) findViewById(R.id.tab_layout);

        TabLayout.Tab tabOne = mTabLayout.newTab();
        tabOne.setCustomView(getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
        mTabLayout.addTab(tabOne);

        TabLayout.Tab tabTwo = mTabLayout.newTab();
        tabTwo.setCustomView(getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
        mTabLayout.addTab(tabTwo);
        tabTwo.select();
        // mTabLayout.setupWithViewPager(mViewPager);
        if (getResources().getDisplayMetrics().widthPixels > getResources().getDisplayMetrics().heightPixels) {
            mTabLayout.setTabMode(TabLayout.MODE_FIXED);
        } else {
            mTabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
        }


        mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                ((TextView) tab.getCustomView().findViewById(R.id.text1)).setTextSize(16);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                ((TextView) tab.getCustomView().findViewById(R.id.text1)).setTextSize(13);
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

iteb_tab.xml可以是-

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:text="One"
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

编辑

通过从适配器本身设置选项卡标题，您可以进一步减少工作量-

        PagerAdapter mPagerAdapter = mViewPager.getAdapter();
        for (int position = 0; position < mPagerAdapter.getCount(); position++) {
            View view = (getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
            TextView label = (TextView) view.findViewById(R.id.text1);
            label.setText(mPagerAdapter.getPageTitle(position));
            TabLayout.Tab tab = mTabLayout.newTab();
            tab.setCustomView(view);
            mTabLayout.addTab(tab);
        }

PagerAdapter mPagerAdapter=mviewpage.getAdapter（）；
对于（int position=0；position

下面是它的样子-
谢谢你的回答，但是文本大小没有改变。我尝试过改变textColor-效果很好。知道为什么textSize没有改变吗？再次检查答案@lounchyIt Works！textSize正在改变，非常感谢！@Amir\u p，嗨，我正在使用你的答案，只是没有自定义视图，因为默认情况下TextView在TabView中存在，大小不会随着时间的推移而改变选择一个标签，但是如果setText方法确实改变了文本。TabLayout高度设置为wrap_内容，所以我找不到文本没有变大的任何原因。也许你可以帮我解决这个问题，并且如果你能解释TabLayout.tab和TabLayout.TabView之间的区别，因为我很难理解你为什么不直接修改您可以使用tab对象，而不是tab的位置？感谢您不用从view pager设置选项卡布局，而是使用您的代码进行设置。例如创建选项卡并为其设置自定义视图。
for (int i = 0; i < tabLayout.getTabCount(); i++) {
    TabLayout.Tab tab = tabLayout.getTabAt(i);
    if (tab != null) {
        View customView = tab.getCustomView();
        if (customView != null) {
            TextView yourTv = (TextView) customView.findViewById(R.id.tv);
            if (yourTv != null) {
                if (i == selectedTabIndex) {
                    yourTv.setTextSize(18);
                } else {
                    yourTv.setTextSize(16);
                }
            }
        }
    }
}

        TabLayout mTabLayout = (TabLayout) findViewById(R.id.tab_layout);

        TabLayout.Tab tabOne = mTabLayout.newTab();
        tabOne.setCustomView(getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
        mTabLayout.addTab(tabOne);

        TabLayout.Tab tabTwo = mTabLayout.newTab();
        tabTwo.setCustomView(getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
        mTabLayout.addTab(tabTwo);
        tabTwo.select();
        // mTabLayout.setupWithViewPager(mViewPager);
        if (getResources().getDisplayMetrics().widthPixels > getResources().getDisplayMetrics().heightPixels) {
            mTabLayout.setTabMode(TabLayout.MODE_FIXED);
        } else {
            mTabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
        }


        mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                ((TextView) tab.getCustomView().findViewById(R.id.text1)).setTextSize(16);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                ((TextView) tab.getCustomView().findViewById(R.id.text1)).setTextSize(13);
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:text="One"
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

            mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }
            @Override
            public void onPageSelected(int position) {
                mTabLayout.getTabAt(position).select();
            }
            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });

        PagerAdapter mPagerAdapter = mViewPager.getAdapter();
        for (int position = 0; position < mPagerAdapter.getCount(); position++) {
            View view = (getLayoutInflater().inflate(R.layout.item_tab, mTabLayout, false));
            TextView label = (TextView) view.findViewById(R.id.text1);
            label.setText(mPagerAdapter.getPageTitle(position));
            TabLayout.Tab tab = mTabLayout.newTab();
            tab.setCustomView(view);
            mTabLayout.addTab(tab);
        }