在XML布局文件中，将ViewPager和TabLayout放在一个父布局中。

在Activity的onCreate方法中，初始化ViewPager和TabLayout，并与FragmentAdapter关联。

viewPager = findViewById(R.id.view_pager);
tabLayout = findViewById(R.id.tab_layout);

FragmentAdapter adapter = new FragmentAdapter(getSupportFragmentManager());

viewPager.setAdapter(adapter);
tabLayout.setupWithViewPager(viewPager);

创建FragmentAdapter类，继承FragmentPagerAdapter，并实现getItem和getCount方法。getItem方法用于返回ViewPager中关联的Fragment，getCount方法用于返回Fragment的数量。

private class FragmentAdapter extends FragmentPagerAdapter {
    private final String[] titles = {"Tab1", "Tab2", "Tab3"};

    public FragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return new Fragment1();
            case 1:
                return new Fragment2();
            case 2:
                return new Fragment3();
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return titles.length;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }
}

创建三个Fragment，并设置布局和逻辑。

public class Fragment1 extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_1, container, false); // 设置布局文件
        return view;
    }
}

public class Fragment2 extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_2, container, false); // 设置布局文件
        return view;
    }
}

public class Fragment