TabLayout+ViewPager实现tab和页面联动效果

目录：android.support.design.widget.TabLayout

xml中：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.TabLayout
        android:id="@+id/toolbar_tl_tab"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:layout_gravity="bottom"
        app:layout_scrollFlags="scroll"
        app:tabIndicatorColor="@android:color/holo_green_light"
        app:tabSelectedTextColor="@android:color/holo_green_light" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#f0f0f0" />

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

代码中使用：

public class MainActivity extends AppCompatActivity {

    private TabLayout toolbar_tl_tab;
    private ViewPager vp_container;
    private String[] titles = {"标题1", "标题2", "标题3", "标题4"};

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

    private void init() {
        toolbar_tl_tab = (TabLayout) findViewById(R.id.toolbar_tl_tab);
        vp_container = (ViewPager) findViewById(R.id.vp_container);
        toolbar_tl_tab.setupWithViewPager(vp_container);
        toolbar_tl_tab.setTabMode(TabLayout.MODE_SCROLLABLE);
        vp_container.setAdapter(new FragmentStatePagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return new PageFragment();
            }

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

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

}

碎片：PageFragment

public class PageFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_page, null);
        return view;
    }
}

碎片xml：fragment_page.xml

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="页面" />
</LinearLayout>

注意：

1、模式相关
使用滚动模式，特点是超过屏幕可以滚动显示：

toolbar_tl_tab.setTabMode(TabLayout.MODE_SCROLLABLE);

使用屏幕等分模式，特点是显示tab的宽度是屏幕等分后的宽度：

toolbar_tl_tab.setTabMode(TabLayout.MODE_FIXED);