1. 初始化
   1）在xml中設(shè)置顏色變化

   app:tabTextColor="@color/white_7f"
   app:tabSelectedTextColor="@color/white"

   其中，tabTextColor未未選中時的顏色，tabSelectedTextColor為選中時的顏色。
   2）對已定義好的TabLayout進行處理。

   //獲取TabLayout設(shè)置的字體顏色,包含tabTextColor及tabSelectedTextColor
   ColorStateList colorStateList = tabLayout.getTabTextColors();
   //對每個Tab 設(shè)置customView，設(shè)置為TextView，用于設(shè)置字體大小等
   for (int i = 0; i < tabLayout.getTabCount(); i++) {
       TabLayout.Tab tab = tabLayout.getTabAt(i);
       assert tab != null;
       String tabStr = Objects.requireNonNull(tab.getText()).toString();
       if(tab.getCustomView() == null || !(tab.getCustomView() instanceof TextView)){
            TextView tv = new TextView(tabLayout.getContext());
            tv.setTextColor(colorStateList);
            tv.setText(tabStr);
            tv.setTextSize(tab.isSelected()?selectSize:unSelectSize);
            tab.setCustomView(tv);
       }
   }

2. 在監(jiān)聽器中設(shè)置樣式

   tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
               @Override
               public void onTabSelected(TabLayout.Tab tab) {
                   String tabStr = Objects.requireNonNull(tab.getText()).toString();
                   if(onSelectedListener!=null){
                       onSelectedListener.onSelected(tabStr);
                   }
                   if(enableChangeSize){
                       TextView tv = (TextView) tab.getCustomView();
                       assert tv != null;
                       tv.setTextSize(selectSize);
                   }
               }
   
               @Override
               public void onTabUnselected(TabLayout.Tab tab) {
                   if(enableChangeSize){
                       TextView tv = (TextView) tab.getCustomView();
                       assert tv != null;
                       tv.setTextSize(unSelectSize);
                   }
               }
   
               @Override
               public void onTabReselected(TabLayout.Tab tab) {
   
               }
           });

   在選中時或未選中時，獲取已設(shè)置的TextView，然后可以去設(shè)置需要的大小、加粗等變化。

3. 我做了一個簡單的封裝，這里分享一下。文章來源地址http://www.zghlxwxcb.cn/news/detail-531448.html

   
   public class TabLayoutUtil {
       private final TabLayout tabLayout;
       private boolean enableChangeSize = false;
       private int unSelectSize = 15,selectSize = 16;
   
       private TabLayoutUtil(TabLayout tabLayout) {
           this.tabLayout = tabLayout;
       }
   
       public static TabLayoutUtil build(TabLayout tabLayout){
           return new TabLayoutUtil(tabLayout);
       }
   
       public TabLayoutUtil enableChangeStyle() {
           this.enableChangeSize = true;
           ColorStateList colorStateList = tabLayout.getTabTextColors();
           for (int i = 0; i < tabLayout.getTabCount(); i++) {
               TabLayout.Tab tab = tabLayout.getTabAt(i);
               assert tab != null;
               String tabStr = Objects.requireNonNull(tab.getText()).toString();
               if(tab.getCustomView() == null || !(tab.getCustomView() instanceof TextView)){
                   TextView tv = new TextView(tabLayout.getContext());
                   //使用默認TabItem樣式時，需要添加LayoutParams，否則會出現(xiàn)Tab文字不居中問題
                   ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(-2,-2);
                   tv.setLayoutParams(params);
                   tv.setTextColor(colorStateList);
                   tv.setText(tabStr);
                   tv.setTextSize(tab.isSelected()?selectSize:unSelectSize);
                   tab.setCustomView(tv);
               }
           }
           return this;
       }
   
       public TabLayoutUtil setTextSizes(int selectSize,int unSelectSize) {
           this.selectSize = selectSize;
           this.unSelectSize = unSelectSize;
           return this;
       }
   
   
       public TabLayoutUtil setOnSelectedListener(OnSelectedListener onSelectedListener) {
           tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
               @Override
               public void onTabSelected(TabLayout.Tab tab) {
                   String tabStr = Objects.requireNonNull(tab.getText()).toString();
                   if(onSelectedListener!=null){
                       onSelectedListener.onSelected(tabStr);
                   }
                   if(enableChangeSize){
                       TextView tv = (TextView) tab.getCustomView();
                       assert tv != null;
                       tv.setTextSize(selectSize);
                   }
               }
   
               @Override
               public void onTabUnselected(TabLayout.Tab tab) {
                   if(enableChangeSize){
                       TextView tv = (TextView) tab.getCustomView();
                       assert tv != null;
                       tv.setTextSize(unSelectSize);
                   }
               }
   
               @Override
               public void onTabReselected(TabLayout.Tab tab) {
   
               }
           });
           return this;
       }
   
       public interface OnSelectedListener{
           void onSelected(String tabStr);
       }
   }
   

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