Viewpager实现滑块切换效果

activity_main.xml

<?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=".MainActivity">
    <androidx.viewpager2.widget.ViewPager2
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/viewpager"
        android:background="@color/teal_200">

    </androidx.viewpager2.widget.ViewPager2>



</LinearLayout>

mainactivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ViewPager2 viewPager=findViewById(R.id.viewpager);
        ViewPagerAdapter viewPagerAdapter=new ViewPagerAdapter();
        viewPager.setAdapter(viewPagerAdapter);

    }

创建item_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:id="@+id/container">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tvtitle"
        android:textSize="50dp"
        android:textColor="@color/white"
        android:text="hello"/>
</RelativeLayout>

创建 ViewPagerAdapter.java

public class ViewPagerAdapter extends RecyclerView.Adapter<ViewPagerAdapter.ViewPagerViewHolder> {
    private List<String> titles=new ArrayList<>();
    public ViewPagerAdapter(){
        titles.add("1");
        titles.add("2");
        titles.add("3");
        titles.add("4");
        titles.add("5");
    }
    @NonNull
    @Override
    public ViewPagerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewPagerViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_pager,parent,false));
    }

    //绑定数据
    @Override
    public void onBindViewHolder(@NonNull ViewPagerViewHolder holder, int position) {

        holder.mtv.setText(titles.get(position));
    }
    //返回的值为绑定的个数
    @Override
    public int getItemCount() {
        return 5;
    }
    //解析item_pager.xml
    class ViewPagerViewHolder extends RecyclerView.ViewHolder{
        TextView mtv;
        RelativeLayout mContainer;
        public ViewPagerViewHolder(@NonNull View itemView){
            super(itemView);
            mContainer=itemView.findViewById(R.id.container);
            mtv=itemView.findViewById(R.id.tvtitle);
        }
    }

}