Introduction

The ViewPager2 framework is a component in the Android support library to achieve the sliding switching effect between pages.It is an upgraded version of ViewPager, which provides some new features and improvements. The technical principle of ViewPager2 is based on RecyclerView.Unlike ViewPager, ViewPager2 uses RecyclerView as its internal implementation mechanism, so it inherits all the advantages of RecyclerView. RecyclerView is a powerful back -to -view diagram container that can achieve data reuse and asynchronous loading to improve the smoothness and performance.ViewPager2 provides users with a better sliding experience by using these features of RecyclerView. ViewPager2 uses Adapter to provide data and view for it.Users can customize the layout and content of each page in ViewPager2 to meet different needs to meet different needs. It only takes four steps to use ViewPager2: 1. Add ViewPager2 component to the layout file: <androidx.viewpager2.widget.ViewPager2 android:id="@+id/viewPager2" android:layout_width="match_parent" android:layout_height="match_parent" /> 2. Instantly ViewPager2 in Java code: ViewPager2 viewPager2 = findViewById(R.id.viewPager2); 3. Create a custom adapter to provide data and views for ViewPager2: public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { // Related methods to implement adapter // ... } 4. Set the adapter to viewpager2: MyAdapter adapter = new MyAdapter(); viewPager2.setAdapter(adapter); Through these four steps, a simple viewPager2 can be achieved, and users can customize Adapter to achieve different layout and content display requirements. ViewPager2 also provides some other features, such as supporting nested sliding, sliding direction control and page switching animation.Users can set and customize through the method of ViewPager2. In short, ViewPager2 is a very powerful and flexible page sliding switching framework. Its technical principles are based on RecyclerView and provided users with data and view implementation through Adapter.Using ViewPager2 can easily achieve various sliding effects and layout requirements.