TabLayout结合ViewPager实现顶部导航

这是效果图

点击标签，手指左右滑动都是可以实现翻页的。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tab"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="12"/>

</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager viewPager;

    FragmentAdapter adapter;

    //Fragment队列和标题队列
    private List<Fragment> fragmentList;
    private List<String> titleList;

    //4个Fragment
    private Fragment firstFragment;
    private Fragment secondFragment;
    private Fragment thirdFragment;
    private Fragment fourthFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();//初始化

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

    private void initView() {
        tabLayout = findViewById(R.id.tab);
        viewPager = findViewById(R.id.viewpager);

        firstFragment = new FirstFragment();
        secondFragment = new SecondFragment();
        thirdFragment = new ThirdFragment();
        fourthFragment = new FourthFragment();

        fragmentList = new ArrayList<Fragment>();
        titleList = new ArrayList<String>();

        fragmentList.add(firstFragment);
        fragmentList.add(secondFragment);
        fragmentList.add(thirdFragment);
        fragmentList.add(fourthFragment);

        titleList.add("第一页");
        titleList.add("第二页");
        titleList.add("第三页");
        titleList.add("第四页");

        adapter = new FragmentAdapter(getSupportFragmentManager(), fragmentList, titleList);
    }
}

FragmentAdapter.java

public class FragmentAdapter extends FragmentPagerAdapter {

    private List<Fragment> fragmentList;
    private List<String> titleList;


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

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

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

    //这个方法是为了显示名称
    @Override
    public CharSequence getPageTitle(int position) {
        return titleList.get(position);
    }
}

FirstFragment.java

public class FirstFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        TextView view = new TextView(getActivity());
        view.setTextSize(60);
        view.setText("**********\n这是第一页\n*************");
        return view;
    }
}

其他注意事项

1. 其他3个Fragment仿照FirstFragment来写即可
2. TabLayout需要添加依赖 implementation ‘com.google.android.material:material:1.0.0’