Android使用ViewPager实现翻页效果

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ViewPagerActivity">
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

<?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:background="#CF1717"
    android:gravity="center">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一个layout"
        android:textSize="20sp" />
</LinearLayout>

public class ViewPagerActivity extends AppCompatActivity {
    private ViewPager view_pager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_pager);
        view_pager = findViewById(R.id.view_pager);
        View inflate1 = LayoutInflater.from(this).inflate(R.layout.viewpager1, null);
        View inflate2 = LayoutInflater.from(this).inflate(R.layout.viewpager2, null);
        View inflate3 = LayoutInflater.from(this).inflate(R.layout.viewpager3, null);
        List<View> viewList = new ArrayList<>();
        viewList.add(inflate1);
        viewList.add(inflate2);
        viewList.add(inflate3);

        MyAdapter myAdapter = new MyAdapter(viewList);
        view_pager.setAdapter(myAdapter);

    }
}

public class MyAdapter extends PagerAdapter {
    private List<View> viewList;

    public MyAdapter(List<View> viewList) {
        this.viewList = viewList;
    }

    //获取多少View
    @Override
    public int getCount() {
        return viewList.size();
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        container.addView(viewList.get(position), 0);
        return viewList.get(position);
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView(viewList.get(position));
    }
}