onTabSelected 选中未调用

Question

我刚刚将旧 ActionBar 迁移到新 TabLayout（支持 Material 设计）。

一切都很好，但我无法拦截选项卡选择方法onTabSelected只在第一次显示TabLayout时被调用，但是点击tabs时，没有任何反应！知道这段代码有什么问题吗？

 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);

Answer 1

当您调用 setupWithViewPager 时，这将在内部调用 setOnTabSelectedListener(new ViewPagerOnTabSelectedListener(viewPager));，覆盖您的 OnTabSelectedListener。

相反，您的侦听器应扩展 TabLayout.ViewPagerOnTabSelectedListener，然后覆盖 onTabSelected() 并在 setupWithViewPager():

之后调用 setOnTabSelectedListener()

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

Answer 2

这是一个更完整的示例，其中包含三个选项卡。它使用较新的 <strong>add</strong>OnTabSelectedListener 而不是 <strong>set</strong>OnTabSelectedListener .

TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
        (getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        viewPager.setCurrentItem(tab.getPosition());
        Log.i("TAG", "onTabSelected: " + tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {
        Log.i("TAG", "onTabUnselected: " + tab.getPosition());
    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {
        Log.i("TAG", "onTabReselected: " + tab.getPosition());
    }
});

备注：

onTabSelected 和 onTabUnselected 每次选项卡发生变化时都会被调用。
onTabReselected 每当再次单击已显示的选项卡时调用。

onTabSelected 选中未调用

onTabSelected Selected Not Called

tabs

android