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Creating Swipe Views with Tabs

Creating Swipe Views with Tabs

作者: 独倚栏杆 | 来源:发表于2017-09-26 18:41 被阅读0次

    在ViewPager一篇里面有这么一句:For more information about how to use ViewPager, read Creating Swipe Views with Tabs.所以为了探索ViewPager的全貌,决定写这一篇。

    • 滑动视图提供兄弟屏幕之间的横向导航,例如具有水平手指手势(有时称为水平分页)的标签的标签。本课程教你如何创建一个带有滑动视图的选项卡布局,用于在选项卡之间切换,或者如何显示标题栏而不是选项卡。

    Implement Swipe Views

    在XML文件中创建ViewPager

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.view.ViewPager
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    

    要插入代表每个页面的子视图,你需要将此布局挂接到PagerAdapter。你可以使用两种适配器:
    FragmentPagerAdapter
    在同步屏幕之间进行导航,这表示固定的,少量的页面是最好的。
    FragmentStatePagerAdapter
    这最适合在不确定页数的对象集合之间进行分页。 当用户导航到其他页面时,它会破坏Fragment,从而尽量减少内存使用。
    例如,以下是使用FragmentStatePagerAdapter的栗子:

    public class CollectionDemoActivity extends FragmentActivity {
        // When requested, this adapter returns a DemoObjectFragment,
        // representing an object in the collection.
        DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
        ViewPager mViewPager;
    
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_collection_demo);
    
            // ViewPager and its adapters use support library
            // fragments, so use getSupportFragmentManager.
            mDemoCollectionPagerAdapter =
                    new DemoCollectionPagerAdapter(
                            getSupportFragmentManager());
            mViewPager = (ViewPager) findViewById(R.id.pager);
            mViewPager.setAdapter(mDemoCollectionPagerAdapter);
        }
    }
    
    // Since this is an object collection, use a FragmentStatePagerAdapter,
    // and NOT a FragmentPagerAdapter.
    public class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
        public DemoCollectionPagerAdapter(FragmentManager fm) {
            super(fm);
        }
    
        @Override
        public Fragment getItem(int i) {
            Fragment fragment = new DemoObjectFragment();
            Bundle args = new Bundle();
            // Our object is just an integer :-P
            args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1);
            fragment.setArguments(args);
            return fragment;
        }
    
        @Override
        public int getCount() {
            return 100;
        }
    
        @Override
        public CharSequence getPageTitle(int position) {
            return "OBJECT " + (position + 1);
        }
    }
    
    // Instances of this class are fragments representing a single
    // object in our collection.
    public static class DemoObjectFragment extends Fragment {
        public static final String ARG_OBJECT = "object";
    
        @Override
        public View onCreateView(LayoutInflater inflater,
                ViewGroup container, Bundle savedInstanceState) {
            // The last two arguments ensure LayoutParams are inflated
            // properly.
            View rootView = inflater.inflate(
                    R.layout.fragment_collection_object, container, false);
            Bundle args = getArguments();
            ((TextView) rootView.findViewById(android.R.id.text1)).setText(
                    Integer.toString(args.getInt(ARG_OBJECT)));
            return rootView;
        }
    }
    

    此示例仅显示创建滑动视图所需的代码。 以下部分显示如何添加选项卡,以帮助促进页面之间的导航。

    Add Tabs to the Action Bar


    未完待续。。。

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