如何在 RecyclerView 项目出现时为其设置动画 [英] How to animate RecyclerView items when they appear

问题描述

当出现 RecyclerView 项目时，我该如何动画?

How can I animate the RecyclerView Items when there are appearing?

默认项目动画器仅在设置回收器数据后添加或删除数据时才动画.我是新开发的应用程序，不知道从哪里开始.

The default item animator only animates when a data is added or removed after the recycler data has been set. I'm new developing applications and don't have any clue where to start.

任何想法如何实现这一目标?

Any ideas how to achieve this?

推荐答案

Made Simple with XML only

Made Simple with XML only

访问要点链接

res/anim/layout_animation.xml

<?xml version="1.0" encoding="utf-8"?>
    <layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
        android:animation="@anim/item_animation_fall_down"
        android:animationOrder="normal"
        android:delay="15%" />

res/anim/item_animation_fall_down.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500">

    <translate
        android:fromYDelta="-20%"
        android:toYDelta="0"
        android:interpolator="@android:anim/decelerate_interpolator"
        />

    <alpha
        android:fromAlpha="0"
        android:toAlpha="1"
        android:interpolator="@android:anim/decelerate_interpolator"
        />

    <scale
        android:fromXScale="105%"
        android:fromYScale="105%"
        android:toXScale="100%"
        android:toYScale="100%"
        android:pivotX="50%"
        android:pivotY="50%"
        android:interpolator="@android:anim/decelerate_interpolator"
        />

</set>

在布局和 recylcerview 中使用，例如:

Use in layouts and recylcerview like:

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layoutAnimation="@anim/layout_animation"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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