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];
}
}
}
4.其他属性：
app:tabIndicatorColor ：指示线的颜色
app:tabIndicatorHeight ： 指示线的高度
app:tabIndicatorFullWidth="false" 指示线是否铺满宽度
app:tabSelectedTextColor ： tab选中时的字体颜色
app:tabTextColor="@color/colorPrimary" ：未选中字体颜色
app:tabBackground="color" ： 整个tablayout颜色
app:tabMode="scrollable" ： 默认是fixed，固定的；scrollable：可滚动的
