带有 TabLayout 的 ViewPager

一个 TabLayout 可用于更方便的导航。
你可以使用 TabLayout.newTab() 方法为适配器中的每个片段设置选项卡,但还有另一种更方便,更简单的方法,即 TabLayout.setupWithViewPager()

每次调用时,此方法都会根据与 ViewPager 关联的适配器的内容创建和删除选项卡进行同步。
此外,它将设置回调,因此每次用户翻页时,都会选择相应的选项卡。

只需定义一个布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        app:tabMode="scrollable" />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="1" />

</LinearLayout>

然后实现 FragmentPagerAdapter 并将其应用于 ViewPager

public class MyViewPagerActivity extends AppCompatActivity {
    private static final String TAG = MyViewPagerActivity.class.getName();

    private MyPagerAdapter mFragmentAdapter;
    private ViewPager mViewPager;
    private TabLayout mTabLayout;

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

        // Get the ViewPager and apply the PagerAdapter
        mFragmentAdapter = new MyPagerAdapter(getSupportFragmentManager());    
        mViewPager = (ViewPager) findViewById(R.id.view_pager);
        mViewPager.setAdapter(mFragmentAdapter);

        // link the tabLayout and the viewpager together
        mTabLayout = (TabLayout) findViewById(R.id.tab_layout);
        mTabLayout.setupWithViewPager(mViewPager);
    }

    private class MyPagerAdapter extends FragmentPagerAdapter{

        public MyPagerAdapter(FragmentManager supportFragmentManager) {
            super(supportFragmentManager);
        }

         // Returns the fragment to display for that page
        @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;
            }
        }
        
        // Will be displayed as the tab's label
        @Override
        public CharSequence getPageTitle(int position) {
            switch(position) {
                case 0:
                    return "Fragment 1 title";

                case 1:
                    return "Fragment 2 title";

                case 2:
                    return "Fragment 3 title";

                default:
                    return null;
            }
        }

        // Returns total number of pages 
        @Override
        public int getCount() {
            return 3;
        }

    }
}