访问Tablayout中片段的xml

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimary"
    app:tabTextColor="@color/tab_text_color"
    app:tabSelectedTextColor="@color/tab_selected_text_color"
    app:tabIndicatorColor="@color/tab_indicator_color"
    app:tabIndicatorHeight="2dp"
    app:tabMode="fixed"
    app:tabGravity="fill" />

<android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

public class MyPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> fragmentList;

    public MyPagerAdapter(FragmentManager fm, List<Fragment> fragmentList) {
        super(fm);
        this.fragmentList = fragmentList;
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }
}

TabLayout tabLayout = findViewById(R.id.tabLayout);
ViewPager viewPager = findViewById(R.id.viewPager);

List<Fragment> fragmentList = new ArrayList<>();
fragmentList.add(new Fragment1());
fragmentList.add(new Fragment2());
fragmentList.add(new Fragment3());

MyPagerAdapter pagerAdapter = new MyPagerAdapter(getSupportFragmentManager(), fragmentList);
viewPager.setAdapter(pagerAdapter);
tabLayout.setupWithViewPager(viewPager);