java—虽然我有3个选项卡，但tablayout.getchildcount()返回1

8wigbo56 于 2021-08-25 发布在 Java

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我在viewpager中添加了3个选项卡，然后使用setupwithviewpager创建相应的选项卡：

private void setupFragments(){
    ViewPager mViewPager = findViewById(R.id.container);
    SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager());
    adapter.addFragment(new SignalsFragment(),"Live Signals");
    adapter.addFragment(new FavSignalsFragment(),"Fav Signals");
    adapter.addFragment(new RemotesFragment(),"Remotes");
    mViewPager.setAdapter(adapter);

    TabLayout tabLayout = findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);
    System.out.println("Number Of Tabs: "+tabLayout.getChildCount());
}

它返回1我需要通过标签以太化，为它们设置onlongclicklistener。。。
感谢您的帮助。

Java android android-viewpager

来源：https://stackoverflow.com/questions/68292301/while-i-have-3-tabs-tablayout-getchildcount-returns-1

1条答案

按热度按时间

xwbd5t1u1#

在这里，我发现了问题和解决方案：我把tablayout的直接子对象与tabs误认为了，而tablayout对象只有一个直接子对象，它是一组tabs。因此，关键是首先提取该群体并通过其子女以太化。以下是对我有用的代码：

private void setupFragments(){
    ViewPager mViewPager = findViewById(R.id.container);
    SectionsPageAdapter adapter = new 
    SectionsPageAdapter(getSupportFragmentManager());
    adapter.addFragment(new SignalsFragment(),"Live Signals");
    adapter.addFragment(new FavSignalsFragment(),"Fav Signals");
    adapter.addFragment(new RemotesFragment(),"Remotes");
    mViewPager.setAdapter(adapter);

    TabLayout tabLayout = findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);

    View tabLayoutChild = tabLayout.getChildAt(0);
    ViewGroup group = (ViewGroup) tabLayoutChild;
    group.getChildAt(0).setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            return true;
        }
    });
}

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java—虽然我有3个选项卡，但tablayout.getchildcount()返回1

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