1.首先添加依赖：

以前的是

implementation'com.android.support:design:28.0.0'

换成

implementation "com.google.android.material:material:1.0.0"

2.xml布局：

<com.google.android.material.tabs.TabLayout

android:id="@+id/tab_layout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

app:tabGravity="fill"

app:tabMaxWidth="0dp"

app:tabIndicatorColor="@color/colorAccent"

app:tabSelectedTextColor="@color/colorPrimary"

app:tabTextColor="@color/colorPrimary"

app:tabIndicatorFullWidth="false"

app:tabBackground="@color/transparent"

app:tabRippleColor="@color/transparent"

>

</com.google.android.material.tabs.TabLayout>

<View

android:layout_width="match_parent"

android:layout_height="0.5dp"

android:background="#E4E4E4"

></View>

<androidx.viewpager.widget.ViewPager

android:id="@+id/viewPager"

android:layout_width="match_parent"

android:layout_height="match_parent" >

</androidx.viewpager.widget.ViewPager>

3.java代码：

public class MainActivityB extends AppCompatActivity {

static final int NUM_ITEMS = 4;

private List<Fragment> fragmentList = new ArrayList<Fragment>();

private String[] strings = new String[]{"A","B","C","D"};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_mainb);

fragmentList.add(new FragmentA());

fragmentList.add(new FragmentB());

fragmentList.add(new FragmentC());

fragmentList.add(new FragmentD());

initView();

}

private void initView(){

TabLayout tab_layout = findViewById(R.id.tab_layout);

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

MyAdapter fragmentAdater = new MyAdapter(getSupportFragmentManager());

viewPager.setAdapter(fragmentAdater);

tab_layout.setupWithViewPager(viewPager);

}

public class MyAdapter extends FragmentPagerAdapter {

public MyAdapter(FragmentManager fm) {

super(fm);

}

@Override

public int getCount() {

return NUM_ITEMS;

}

@Override

public Fragment getItem(int position) {

return fragmentList.get(position);

}

@Nullable

@Override

public CharSequence getPageTitle(int position) {

return strings[position];

}

}

}