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基于TabLayoutMediator实现TabLayout+ViewPager2（Fragment）封装

作者：笔触狂放9 | 2024-04-19 05:04:03

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tablayoutmediator

实现功能

1、TabLayout+ViewPager2(Fragments)

2、TabLayout

①、动态设置TabView（setTabViewResId），TextView动态设置IdseTabViewTextResId()，并获取TextView对象

②、默认全部Fragmnet预加载，可通过setOffscreenPageLimit(boolean)控制

③、UserTabConfigurationStrategy监听，获取所有TabView初始化对象

④、UserTabSelectedListener，获取TabLayout切换时候监听回调，包含切换前后上个item position

⑤、设置和更新  未读数和小红，包含是否开启初始化后立马显示未读数和小红点，也可以网络请求后设置

⑥、TabView支持选中字体加粗、字体大小、颜色，未选中字体加粗、字体大小、颜色

⑦、设置TextView，内边距和外边距。

在保留官方TabLayout和ViewPager2所有特性前提下，封装其他公共方法。

UserTabLayoutMediator代码：

  1. public final class UserTabLayoutMediator implements TabLayout.OnTabSelectedListener {
  2.     private static final long ATTACH_DRAWABLE_VIEW_DELAY_MILLIS = 500l;
  3.  
  4.     private TabLayout tabLayout;
  5.     private ViewPager2 viewPager;
  6.  
  7.     private TabLayoutMediator tabLayoutMediator;
  8.  
  9.     private UserTabConfigurationStrategy userTabConfigurationStrategy;
  10.     private UserTabSelectedListener userTabSelectedListener;
  11.     Map<Integer, BadgeDrawable> badgeDrawableMap = new HashMap<>();
  12.     private boolean attached = false;
  13.     private BadgeDrawableRunnable badgeDrawableRunnable;
  14.     private boolean attachDrawableViewAsync = false;
  15.  
  16.     private @LayoutRes
  17.     int tabViewResId = R.layout.base_user_tab_layout_mediator_tab_view;  //user_tab_layout_mediator_tab_view
  18.     private @IdRes
  19.     int tabViewTextResId = R.id.base_user_tab_layout_mediator_text_view;
  20.     private int selectTextSize;
  21.     private int unselectedTextSize;
  22.     private int selectTextColor;
  23.     private int unselectedTextColor;
  24.     private boolean fakeBoldText;
  25.     private List<String> tabViewTextList;
  26.     //默认设置 OffscreenPageLimit true，则ViewPager Fragment都会初始化并执行到onStart方法。当前台显示onResume->onPause
  27.     private boolean offscreenPageLimit = true;
  28.  
  29.     private int currentItemPosition;
  30.  
  31.     private int gravity;
  32.  
  33.     private int paddingLeft;
  34.     private int paddingTop;
  35.     private int paddingRight;
  36.     private int paddingBottom;
  37.  
  38.     private int marginLeft;
  39.     private int marginTop;
  40.     private int marginRight;
  41.     private int marginBottom;
  42.  
  43.     private int onTabSelectPosition;
  44.  
  45.     public UserTabLayoutMediator() {
  46.  
  47.     }
  48.  
  49.     public UserTabLayoutMediator(TabLayout tabLayout, UserTabConfigurationStrategy tabConfigurationStrategy) {
  50.         this(tabLayout, null, tabConfigurationStrategy);
  51.     }
  52.  
  53.     public UserTabLayoutMediator(ViewPager2 viewPager, UserTabConfigurationStrategy tabConfigurationStrategy) {
  54.         this(null, viewPager, tabConfigurationStrategy);
  55.     }
  56.  
  57.     public UserTabLayoutMediator(TabLayout tabLayout, ViewPager2 viewPager, UserTabConfigurationStrategy tabConfigurationStrategy) {
  58.         this.tabLayout = tabLayout;
  59.         this.viewPager = viewPager;
  60.         this.userTabConfigurationStrategy = tabConfigurationStrategy;
  61.     }
  62.  
  63.     public void setTabViewText(String[] tabViewText) {
  64.         if (tabViewText != null) {
  65.             this.tabViewTextList = new ArrayList<>();
  66.             Collections.addAll(this.tabViewTextList, tabViewText);
  67.         }
  68.     }
  69.  
  70.     public void setTabViewText(List<String> tabViewText) {
  71.         this.tabViewTextList = tabViewText;
  72.     }
  73.  
  74.     //设置自定义tab View resId
  75.     public void setTabViewResId(@LayoutRes int tabViewResId) {
  76.         this.tabViewResId = tabViewResId;
  77.     }
  78.  
  79.     //设置自定义 tabView textViwId
  80.     public void seTabViewTextResId(@IdRes int tabViewTextResId) {
  81.         this.tabViewTextResId = tabViewTextResId;
  82.     }
  83.  
  84.     public void setSelectFakeBoldText(boolean fakeBoldText) {
  85.         this.fakeBoldText = fakeBoldText;
  86.     }
  87.  
  88.     public void setTextSize(int selectTextSize, int unselectedTextSize) {
  89.         this.selectTextSize = selectTextSize;
  90.         this.unselectedTextSize = unselectedTextSize;
  91.     }
  92.  
  93.     public void setTextColor(@ColorRes int selectTextColor, @ColorRes int unselectedTextColor) {
  94.         this.selectTextColor = selectTextColor;
  95.         this.unselectedTextColor = unselectedTextColor;
  96.     }
  97.  
  98.     /**
  99.      * 设置显示的ViewPager item position，未绑定，初始化设置setCurrentItem，当初始化后，直接调用ViewPager.setCurrentItem()
  100.      *
  101.      * @param itemPosition
  102.      */
  103.     public void setCurrentItemPosition(int itemPosition) {
  104.         this.currentItemPosition = itemPosition;
  105.         if (attached) {
  106.             setCurrentItem(itemPosition);
  107.         }
  108.     }
  109.  
  110.     public void setCurrentItem(int item) {
  111.         setCurrentItem(item, true);
  112.     }
  113.  
  114.     public void setCurrentItem(int item, boolean smoothScroll) {
  115.         if (viewPager != null)
  116.             viewPager.setCurrentItem(item, smoothScroll);
  117.     }
  118.  
  119.     public void setAttachDrawableViewAsync(boolean attachDrawableViewAsync) {
  120.         this.attachDrawableViewAsync = attachDrawableViewAsync;
  121.     }
  122.  
  123.     public void setOffscreenPageLimit(boolean limit) {
  124.         this.offscreenPageLimit = limit;
  125.     }
  126.  
  127.     public void setGravity(int gravity) {
  128.         this.gravity = gravity;
  129.     }
  130.  
  131.     public void setPadding(int left, int top, int right, int bottom) {
  132.         this.paddingLeft = left;
  133.         this.paddingTop = top;
  134.         this.paddingRight = right;
  135.         this.paddingBottom = bottom;
  136.     }
  137.  
  138.     public void setMargins(int left, int top, int right, int bottom) {
  139.         this.marginLeft = left;
  140.         this.marginTop = top;
  141.         this.marginRight = right;
  142.         this.marginBottom = bottom;
  143.     }
  144.  
  145.  
  146.     //------设置监听----------------
  147.     public void addUserTabConfigurationStrategy(UserTabConfigurationStrategy tabConfigurationStrategy) {
  148.         this.userTabConfigurationStrategy = tabConfigurationStrategy;
  149.     }
  150.  
  151.     public void addTabSelectedListener(UserTabSelectedListener userTabSelectedListener) {
  152.         this.userTabSelectedListener = userTabSelectedListener;
  153.     }
  154.  
  155.  
  156.     public void attach() {
  157.         attached = true;
  158.         if (tabLayout != null && viewPager != null) {
  159.             viewPager.setCurrentItem(currentItemPosition);
  160.             tabLayoutMediator = new TabLayoutMediator(tabLayout, viewPager, new TabLayoutMediator.TabConfigurationStrategy() {
  161.                 @Override
  162.                 public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
  163.                     if (tabViewResId != View.NO_ID) {
  164.                         View customView = tab.setCustomView(tabViewResId).getCustomView();
  165.                         setTabViewGravity(customView);
  166.                         TextView textView = customView.findViewById(tabViewTextResId);
  167.                         setTabViewText(null, textView, position);
  168.                         setTabViewTextViewPadding(textView);
  169.                         setTabViewTextViewMargins(textView);
  170.  
  171.  
  172.                     } else {
  173.                         setTabViewText(tab, null, position);
  174.                     }
  175.                     if (userTabConfigurationStrategy != null) {
  176.                         userTabConfigurationStrategy.onConfigureTab(tab, position);
  177.                     }
  178.                 }
  179.             });
  180.  
  181.             tabLayout.addOnTabSelectedListener(this);
  182.             RecyclerView.Adapter adapter = viewPager.getAdapter();
  183.             if (offscreenPageLimit && adapter != null) {
  184.                 int itemCount = adapter.getItemCount();
  185.                 if (itemCount > 1)
  186.                     viewPager.setOffscreenPageLimit(itemCount);
  187.             }
  188.             tabLayoutMediator.attach();
  189.             if (attachDrawableViewAsync)
  190.                 attachDrawableViewByAsync();
  191.         }
  192.     }
  193.  
  194.  
  195.     public void detach() {
  196.         attached = false;
  197.         if (tabLayoutMediator != null) {
  198.             tabLayoutMediator.detach();
  199.             tabLayoutMediator = null;
  200.         }
  201.         if (tabLayout != null) {
  202.             tabLayout.removeOnTabSelectedListener(this);
  203.         }
  204.         if (badgeDrawableMap != null) {
  205.             badgeDrawableMap.clear();
  206.         }
  207.         removeDrawableViewCallbacks();
  208.     }
  209.  
  210.  
  211.     /**
  212.      * 添加 BadgeDrawable 小红点
  213.      *
  214.      * @param context
  215.      * @param position
  216.      * @param backgroundColor
  217.      */
  218.     public void addBadgeDrawable(Context context, int position, @ColorRes int backgroundColor) {
  219.         BadgeDrawable badge = BadgeDrawable.create(context);
  220.         badge.setBackgroundColor(ContextCompat.getColor(context, backgroundColor));
  221.         badge.setHorizontalOffset(5);
  222.         badge.setVerticalOffset(5);
  223.         badge.setVisible(true);
  224.         badgeDrawableMap.put(position, badge);
  225.     }
  226.  
  227.     /**
  228.      * 添加 BadgeDrawable 未读数量
  229.      *
  230.      * @param context           上下文
  231.      * @param position          需要添加位置
  232.      * @param backgroundColor   背景颜色
  233.      * @param badgeTextColor    字体颜色
  234.      * @param number            显示未读数量
  235.      * @param maxCharacterCount 最大位数 number 99999， max== 3 则显示：99+
  236.      */
  237.     public void addBadgeDrawable(Context context, int position, @ColorRes int backgroundColor, @ColorRes int badgeTextColor, int number, int maxCharacterCount) {
  238.         BadgeDrawable badge = BadgeDrawable.create(context);
  239.         badge.setBackgroundColor(ContextCompat.getColor(context, backgroundColor));
  240.         badge.setBadgeTextColor(ContextCompat.getColor(context, badgeTextColor));
  241.         badge.setHorizontalOffset(5);
  242.         badge.setVerticalOffset(5);
  243.         badge.setNumber(number);
  244.         badge.setMaxCharacterCount(maxCharacterCount);
  245.         badge.setVisible(true);
  246.         badgeDrawableMap.put(position, badge);
  247.  
  248.     }
  249.  
  250.     /**
  251.      * 绑定 DrawableView
  252.      *
  253.      * @param context
  254.      * @param position
  255.      * @param backgroundColor
  256.      */
  257.     @SuppressLint({"UnsafeExperimentalUsageError", "RestrictedApi"})
  258.     public void attachDrawableView(Context context, int position, @ColorRes int backgroundColor) {
  259.         addBadgeDrawable(context, position, backgroundColor);
  260.         BadgeDrawable badgeDrawable = badgeDrawableMap.get(position);
  261.         if (badgeDrawable != null) {
  262.             View view = badgeDrawableView(position);
  263.             if (view != null) {
  264.                 BadgeUtils.attachBadgeDrawable(badgeDrawable, view);
  265.             }
  266.         }
  267.     }
  268.  
  269.     /**
  270.      * 绑定 DrawableView
  271.      *
  272.      * @param context
  273.      * @param position
  274.      * @param backgroundColor
  275.      * @param badgeTextColor
  276.      * @param number
  277.      * @param maxCharacterCount
  278.      */
  279.     @SuppressLint("UnsafeExperimentalUsageError")
  280.     public void attachDrawableView(Context context, int position, @ColorRes int backgroundColor, @ColorRes int badgeTextColor, int number, int maxCharacterCount) {
  281.         addBadgeDrawable(context, position, backgroundColor, badgeTextColor, number, maxCharacterCount);
  282.         BadgeDrawable badgeDrawable = badgeDrawableMap.get(position);
  283.         if (badgeDrawable != null) {
  284.             View view = badgeDrawableView(position);
  285.             if (view != null) {
  286.                 BadgeUtils.attachBadgeDrawable(badgeDrawable, view);
  287.             }
  288.         }
  289.     }
  290.  
  291.     /**
  292.      * 绑定 DrawableView  不可初始化之后，直接调用
  293.      */
  294.     @SuppressLint("UnsafeExperimentalUsageError")
  295.     public void attachDrawableView() {
  296.         if (tabLayout != null && attached && badgeDrawableMap.size() > 0) {
  297.             for (Map.Entry<Integer, BadgeDrawable> entry : badgeDrawableMap.entrySet()) {
  298.                 TabLayout.Tab tabAt = tabLayout.getTabAt(entry.getKey());
  299.                 BadgeDrawable badgeDrawable = entry.getValue();
  300.                 if (tabAt != null && badgeDrawable != null) {
  301.                     View customView = tabAt.getCustomView();
  302.                     if (customView != null) {
  303.                         View view = customView.findViewById(tabViewTextResId);
  304.                         if (view != null) {
  305.                             BadgeUtils.attachBadgeDrawable(badgeDrawable, view);
  306.                         }
  307.                     }
  308.                 }
  309.             }
  310.         }
  311.     }
  312.  
  313.     /**
  314.      * 异步绑定 DrawableView
  315.      */
  316.     public void attachDrawableViewByAsync() {
  317.         if (tabLayout != null && attached && badgeDrawableMap.size() > 0) {
  318.             badgeDrawableRunnable = new BadgeDrawableRunnable(tabLayout, badgeDrawableMap, tabViewTextResId);
  319.             tabLayout.postDelayed(badgeDrawableRunnable, ATTACH_DRAWABLE_VIEW_DELAY_MILLIS);
  320.         }
  321.     }
  322.  
  323.     /**
  324.      * 移除异步线程
  325.      */
  326.     private void removeDrawableViewCallbacks() {
  327.         if (tabLayout != null && badgeDrawableRunnable != null) {
  328.             tabLayout.removeCallbacks(badgeDrawableRunnable);
  329.         }
  330.     }
  331.  
  332.  
  333.     /**
  334.      * 更新 BadgeDrawable
  335.      *
  336.      * @param position
  337.      * @param number
  338.      */
  339.     @SuppressLint("UnsafeExperimentalUsageError")
  340.     public void updateBadgeDrawable(int position, int number) {
  341.         if (badgeDrawableMap != null) {
  342.             if (badgeDrawableMap.containsKey(position)) {
  343.                 BadgeDrawable badgeDrawable = badgeDrawableMap.get(position);
  344.                 if (badgeDrawable != null) {
  345.                     badgeDrawable.setNumber(number);
  346.                     View view = detachBadgeDrawable(position);
  347.                     if (view != null) {
  348.                         BadgeUtils.attachBadgeDrawable(badgeDrawable, view);
  349.                     }
  350.                 }
  351.             }
  352.         }
  353.     }
  354.  
  355.     /**
  356.      * 移除 BadgeDrawable
  357.      *
  358.      * @param position
  359.      * @return
  360.      */
  361.     @SuppressLint("UnsafeExperimentalUsageError")
  362.     public View detachBadgeDrawable(int position) {
  363.         if (badgeDrawableMap != null && position < badgeDrawableMap.size()) {
  364.             BadgeDrawable badgeDrawable = badgeDrawableMap.get(position);
  365.             if (badgeDrawable != null) {
  366.                 badgeDrawable.setVisible(false);
  367.                 View view = badgeDrawableView(position);
  368.                 if (view != null) {
  369.                     BadgeUtils.detachBadgeDrawable(badgeDrawable, view);
  370.                 }
  371.                 return view;
  372.             }
  373.         }
  374.         return null;
  375.     }
  376.  
  377.     /**
  378.      * 获取当前 badgeDrawable ---view
  379.      *
  380.      * @param position
  381.      * @return
  382.      */
  383.     private View badgeDrawableView(int position) {
  384.         if (tabLayout != null) {
  385.             TabLayout.Tab tabAt = tabLayout.getTabAt(position);
  386.             if (tabAt != null) {
  387.                 View customView = tabAt.getCustomView();
  388.                 if (customView != null) {
  389.                     return customView.findViewById(tabViewTextResId);
  390.  
  391.                 }
  392.             }
  393.         }
  394.         return null;
  395.     }
  396.  
  397.     private void setTabViewText(TabLayout.Tab tab, TextView textView, int position) {
  398.         if (tabViewTextList != null && position < tabViewTextList.size()) {
  399.             String text = tabViewTextList.get(position);
  400.             if (tab != null) {
  401.                 tab.setText(text);
  402.             }
  403.  
  404.             if (textView != null)
  405.                 textView.setText(text);
  406.  
  407.         } else {
  408.             RecyclerView.Adapter adapter = viewPager.getAdapter();
  409.             if (adapter instanceof BaseFragmentPagerAdapter) {
  410.                 BaseFragmentPagerAdapter pagerAdapter = (BaseFragmentPagerAdapter) adapter;
  411.                 CharSequence text = pagerAdapter.getPageTitle(position);
  412.                 if (tab != null)
  413.                     tab.setText(text);
  414.  
  415.                 if (textView != null)
  416.                     textView.setText(text);
  417.             }
  418.         }
  419.     }
  420.  
  421.  
  422.     /**
  423.      * 设置tabView textView padding
  424.      *
  425.      * @param view
  426.      */
  427.     private void setTabViewTextViewPadding(View view) {
  428.         if (view != null && (paddingLeft != 0 || paddingTop != 0 || paddingRight != 0 || paddingBottom != 0)) {
  429.             view.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
  430.         }
  431.     }
  432.  
  433.     /**
  434.      * 设置tabView textView margin
  435.      *
  436.      * @param view
  437.      */
  438.     private void setTabViewTextViewMargins(View view) {
  439.         if (view != null && (marginLeft != 0 || marginTop != 0 || marginRight != 0 || marginBottom != 0)) {
  440.             ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
  441.             if (layoutParams instanceof LinearLayout.LayoutParams) {
  442.                 LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) layoutParams;
  443.                 params.setMargins(marginLeft, marginTop, marginRight, marginBottom);
  444.             }
  445.         }
  446.     }
  447.  
  448.     /**
  449.      * 设置tabView gravity
  450.      *
  451.      * @param view
  452.      */
  453.     private void setTabViewGravity(View view) {
  454.         if (view != null && gravity != 0 && view instanceof LinearLayout) {
  455.             LinearLayout linearLayout = (LinearLayout) view;
  456.             linearLayout.setGravity(gravity);
  457.         }
  458.     }
  459.  
  460.  
  461.     @Override
  462.     public void onTabSelected(TabLayout.Tab tab) {
  463.         if (viewPager != null)
  464.             onTabSelectPosition = viewPager.getCurrentItem();
  465.         if (tab != null) {
  466.             View customView = tab.getCustomView();
  467.             if (customView != null) {
  468.                 TextView textView = customView.findViewById(tabViewTextResId);
  469.                 if (textView != null) {
  470.                     if (selectTextSize != 0 && selectTextSize != unselectedTextSize)
  471.                         textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, selectTextSize);
  472.                     if (selectTextColor != 0 && selectTextColor != unselectedTextColor)
  473.                         textView.setTextColor(ContextCompat.getColor(textView.getContext(), selectTextColor));
  474.                     if (fakeBoldText)
  475.                         textView.getPaint().setFakeBoldText(true);
  476.                 }
  477.             }
  478.         }
  479.         if (userTabSelectedListener != null) {
  480.             userTabSelectedListener.onTabSelected(tab, onTabSelectPosition);
  481.         }
  482.     }
  483.  
  484.     @Override
  485.     public void onTabUnselected(TabLayout.Tab tab) {
  486.         if (tab != null) {
  487.             View customView = tab.getCustomView();
  488.             if (customView != null) {
  489.                 TextView textView = customView.findViewById(tabViewTextResId);
  490.                 if (textView != null) {
  491.                     if (selectTextSize != 0 && selectTextSize != unselectedTextSize)
  492.                         textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, unselectedTextSize);
  493.                     if (selectTextColor != 0 && selectTextColor != unselectedTextColor)
  494.                         textView.setTextColor(ContextCompat.getColor(textView.getContext(), unselectedTextColor));
  495.                     if (fakeBoldText)
  496.                         textView.getPaint().setFakeBoldText(false);
  497.                 }
  498.             }
  499.         }
  500.  
  501.         if (userTabSelectedListener != null) {
  502.             userTabSelectedListener.onTabUnselected(tab, onTabSelectPosition);
  503.         }
  504.     }
  505.  
  506.     @Override
  507.     public void onTabReselected(TabLayout.Tab tab) {
  508.         if (userTabSelectedListener != null) {
  509.             userTabSelectedListener.onTabReselected(tab);
  510.         }
  511.     }
  512.  
  513.     /**
  514.      * 异步 BadgeDrawableView
  515.      */
  516.     static class BadgeDrawableRunnable implements Runnable {
  517.         private WeakReference<TabLayout> tabLayoutWeakReference;
  518.         private Map<Integer, BadgeDrawable> badgeDrawableMap;
  519.         private int tabViewTextResId;
  520.  
  521.         public BadgeDrawableRunnable(TabLayout tabLayout, Map<Integer, BadgeDrawable> badgeDrawableMap, int tabViewTextResId) {
  522.             if (tabLayout != null)
  523.                 tabLayoutWeakReference = new WeakReference<>(tabLayout);
  524.             this.badgeDrawableMap = badgeDrawableMap;
  525.             this.tabViewTextResId = tabViewTextResId;
  526.         }
  527.  
  528.         @SuppressLint("UnsafeExperimentalUsageError")
  529.         @Override
  530.         public void run() {
  531.             if (tabLayoutWeakReference != null && tabLayoutWeakReference.get() != null && badgeDrawableMap != null) {
  532.                 TabLayout tabLayout = tabLayoutWeakReference.get();
  533.                 for (Map.Entry<Integer, BadgeDrawable> entry : badgeDrawableMap.entrySet()) {
  534.                     TabLayout.Tab tabAt = tabLayout.getTabAt(entry.getKey());
  535.                     BadgeDrawable badgeDrawable = entry.getValue();
  536.                     if (tabAt != null && badgeDrawable != null) {
  537.                         View customView = tabAt.getCustomView();
  538.                         if (customView != null) {
  539.                             View view = customView.findViewById(tabViewTextResId);
  540.                             if (view != null) {
  541.                                 BadgeUtils.attachBadgeDrawable(badgeDrawable, view);
  542.                             }
  543.                         }
  544.                     }
  545.                 }
  546.             }
  547.         }
  548.     }
  549.  
  550.  
  551.     public interface UserTabConfigurationStrategy {
  552.         /**
  553.          * Called to configure the tab for the page at the specified position. Typically calls {@link
  554.          * TabLayout.Tab#setText(CharSequence)}, but any form of styling can be applied.
  555.          *
  556.          * @param tab      The Tab which should be configured to represent the title of the item at the given
  557.          *                 position in the data set.
  558.          * @param position The position of the item within the adapter's data set.
  559.          */
  560.         void onConfigureTab(@NonNull TabLayout.Tab tab, int position);
  561.     }
  564.     public interface UserTabSelectedListener {
  565.         void onTabSelected(TabLayout.Tab tab, int position);
  567.         /**
  568.          * Called when a tab exits the selected state.
  569.          *
  570.          * @param tab The tab that was unselected
  571.          */
  572.         void onTabUnselected(TabLayout.Tab tab, int unPosition);
  574.         /**
  575.          * Called when a tab that is already selected is chosen again by the user. Some applications may
  576.          * use this action to return to the top level of a category.
  577.          *
  578.          * @param tab The tab that was reselected.
  579.          */
  580.         void onTabReselected(TabLayout.Tab tab);
  582.     }
  585. }
tabView：base_user_tab_layout_mediator_tab_view 

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     android:layout_width="match_parent"
  4.     android:layout_height="match_parent"
  5.     android:gravity="center"
  6.     android:orientation="horizontal">
  7.  
  8.     <TextView
  9.         android:id="@id/base_user_tab_layout_mediator_text_view"
  10.         android:layout_width="wrap_content"
  11.         android:layout_height="wrap_content"
  12.         android:text="" />
  13.  
  14.  
  15. </LinearLayout>

ids.xml

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <resources>
  3.     <!-- tabLayout tabView id -->
  4.     <item name="base_user_tab_layout_mediator_tab_view" type="id"></item>
  5.     <!-- tabLayout tabView textView id -->
  6.     <item name="base_user_tab_layout_mediator_text_view" type="id"></item>
  7. </resources>

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