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Editor to share with you how to use animation in XamarinAndroid RecylerView animation components, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

If the developer wants to add animation to the child elements of RecylerView, you need to use the SetItemAnimator () method in the RecyclerView class, which has the following syntax:

Public virtual void SetItemAnimator (Android.Support.V7.Widget.RecyclerView.ItemAnimator animator)

Where the animator parameter specifies an animation, which is the type of animation listed in Table 1-1.

[example 1-1] the following will animate child elements when adding and deleting child elements of RecylerView. The specific steps are as follows:

(1) create a project called RecylerViewAnimatorsItemAnimator

(2) RecyclerViewAnimators.dll, Square.OkHttp.dll, Square.OkIO.dll, Square.Picasso.dll, Xamarin.Android.Arch.Core.Common.dll, Xamarin.Android.Arch.Lifecycle.Common.dll, Xamarin.Android.Arch.Lifecycle.Runtime.dll, Xamarin.Android.Support.Animated.Vector.Drawable.dll, Xamarin.Android.Support.Annotations.dll, Xamarin.Android.Support.Compat.dll, Xamarin.Android.Support.Core.UI.dll, Xamarin.Android.Support.Core.Utils.dll, Xamarin.Android.Support.Fragment.dll, The Xamarin.Android.Support.Media.Compat.dll, Xamarin.Android.Support.v4.dll, Xamarin.Android.Support.v7.AppCompat.dll, Xamarin.Android.Support.v7.RecyclerView.dll, and Xamarin.Android.Support.Vector.Drawable.dll libraries are added to the reference to the RecylerViewAnimatorsItemAnimator project.

(3) add the picture image.jpg to the drawable folder under Resources of the RecylerViewAnimatorsItemAnimator project.

(4) create a xml file named layout_list_item.

(5) Open the layout_list_item.cs file and build the child elements of RecylerView. The code is as follows:

(6) create an adapter file named DataAdapter.

(7) Open the DataAdapter.cs file and add the following code:

Using System

Using System.Collections.Generic

Using System.Linq

Using System.Text

Using Android.App

Using Android.Content

Using Android.OS

Using Android.Runtime

Using Android.Views

Using Android.Widget

Using Square.Picasso

Using Android.Support.V7.Widget

Namespace RecylerViewAnimatorsItemAnimator

{

Public class DataAdapter: RecyclerView.Adapter

{

Context context

List dataset

/ / Construction method

Public DataAdapter (Context context, List dataset)

{

This.context = context

This.dataset = dataset

}

/ / number of child elements

Public override int ItemCount

{

Get

{

Return dataset.Count

}

}

/ / return a custom ViewHolder

Public override RecyclerView.ViewHolder OnCreateViewHolder (ViewGroup parent, int viewType)

{

Var v = LayoutInflater.From (context) .Inflate (Resource.Layout.layout_list_item, parent, false)

Return new ViewHolder (v)

}

/ / populate the controls in the ViewHolder returned by the onCreateViewHolder () method

Public override void OnBindViewHolder (RecyclerView.ViewHolder holder, int position)

{

Var h = (ViewHolder) holder

Picasso.With (context) .load (Resource.Drawable.image) .into (h.Image)

H.Text.Text = dataset [position]

}

/ / Delete child elements

Public void Remove (int position)

{

Dataset.RemoveAt (position)

NotifyItemRemoved (position)

}

/ / add child elements

Public void Add (string text, int position)

{

Dataset.Insert (position, text)

NotifyItemInserted (position)

}

Private class ViewHolder: RecyclerView.ViewHolder

{

Public ImageView Image {get; private set;}

Public TextView Text {get; private set;}

Public ViewHolder (View itemView)

: base (itemView)

{

Image = itemView.FindViewById (Resource.Id.image)

Text = itemView.FindViewById (Resource.Id.text)

}

}

}

}

Note: developers can trigger child element animations only if they call the NotifyItemRemoved (), NotifyItemInserted (), NotifyItemChanged (), and NotifyItemMoved () methods.

These are all the contents of the article "how to use Animation in RecylerView Animation components in XamarinAndroid". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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