我刚刚迁移我的老动作条新TabLayout（支持材料设计）一切都很好，但我不能拦截选项卡选择该方法onTabSelected只叫第一次显示tabLayout，但点击选项卡时，没有任何反应！任何想法有什么不对的code？

  tabLayout =（TabLayout）findViewById（R.id.tabs）;    tabLayout.setTabMode（TabLayout.MODE_SCROLLABLE）;    mViewPager =（ViewPager）findViewById（R.id.pager）;    如果（mViewPager！= NULL）{        setupViewPager（）;    }    tabLayout.setOnTabSelectedListener（新TabLayout.OnTabSelectedListener（）{        @覆盖        公共无效onTabSelected（TabLayout.Tab标签）{            numTab = tab.getPosition（）;            prefs.edit（）putInt（numTab，numTab）。适用（）。        }        @覆盖        公共无效onTabUnselected（TabLayout.Tab标签）{        }        @覆盖        公共无效onTabReselected（TabLayout.Tab标签）{        }    }）;    tabLayout.setupWithViewPager（mViewPager）; 

解决方案

当你调用 setupWithViewPager ，这将在内部调用 setOnTabSelectedListener（新ViewPagerOnTabSelectedListener（ viewPager））; ，覆盖你的 OnTabSelectedListener

相反，你的听众应该扩展TabLayout.ViewPagerOnTabSelectedListener ，然后覆盖 onTabSelected（）并调用 setOnTabSelectedListener（）在 setupWithViewPager（）：

  tabLayout.setupWithViewPager（mViewPager）;tabLayout.setOnTabSelectedListener（  新TabLayout.ViewPagerOnTabSelectedListener（viewPager）{    @覆盖    公共无效onTabSelected（TabLayout.Tab标签）{        super.onTabSelected（标签）;        numTab = tab.getPosition（）;        prefs.edit（）putInt（numTab，numTab）。适用（）。    }}）; 

I have just migrated my old actionBar to new TabLayout ( Support Material Design ) Everything is great but I can't intercept tab selection The method onTabSelected is only called the first time tabLayout is displayed, but when clicking tabs, nothing happens! Any idea what's wrong with this code?

 tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    mViewPager = (ViewPager) findViewById(R.id.pager);
    if (mViewPager != null) {
        setupViewPager();
    }
    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {

            numTab = tab.getPosition();
            prefs.edit().putInt("numTab", numTab).apply();

        }

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

        }

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

        }
    });

    tabLayout.setupWithViewPager(mViewPager);

When you call setupWithViewPager, this will internally call setOnTabSelectedListener(new ViewPagerOnTabSelectedListener(viewPager));, overriding your OnTabSelectedListener.

Instead, your listener should extend TabLayout.ViewPagerOnTabSelectedListener and then override onTabSelected() and call setOnTabSelectedListener() after setupWithViewPager():

tabLayout.setupWithViewPager(mViewPager);
tabLayout.setOnTabSelectedListener(
  new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        super.onTabSelected(tab);
        numTab = tab.getPosition();
        prefs.edit().putInt("numTab", numTab).apply();

    }
});