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RecyclerView Animators

RecyclerView Animators is an Android library that allows developers to easily create RecyclerView with animations.

Please feel free to use this.

Features

• Animate addition and removal of ItemAnimator
• Appearance animations for items in RecyclerView.Adapter

Demo

ItemAnimator

Adapters

How do I use it?

Setup

Gradle

On your module's build.gradle file add this implementation statement to the dependencies section:

dependencies {
  // Kotlin
  implementation 'jp.wasabeef:recyclerview-animators:4.0.2'
}

Also make sure that the repositories section includes not only "mavenCentral()" but also a maven section with the "google()" endpoint.

repositories {
  google()
  mavenCentral()
  jcenter()
}

ItemAnimator

Step 1

Set RecyclerView ItemAnimator.

val recyclerView = findViewById<RecyclerView>(R.id.list)
recyclerView.itemAnimator = SlideInLeftAnimator()

val recyclerView = findViewById<RecyclerView>(R.id.list)
recyclerView.itemAnimator = SlideInUpAnimator(OvershootInterpolator(1f))

Step 2

Please use the following
notifyItemChanged(int)
notifyItemInserted(int)
notifyItemRemoved(int)
notifyItemRangeChanged(int, int)
notifyItemRangeInserted(int, int)
notifyItemRangeRemoved(int, int)

If you want your animations to work, do not rely on calling notifyDataSetChanged(); as it is the RecyclerView's default behavior, animations are not triggered to start inside this method.

fun remove(position: Int) {
  dataSet.removeAt(position)
  notifyItemRemoved(position)
}

fun add(text: String, position: Int) {
  dataSet.add(position, text)
  notifyItemInserted(position)
}

Advanced Step 3

You can change the durations.

recyclerView.itemAnimator?.apply {
  addDuration = 1000
  removeDuration = 100
  moveDuration = 1000
  changeDuration = 100
}

Advanced Step 4

Change the interpolator.

recyclerView.itemAnimator = SlideInLeftAnimator().apply {
  setInterpolator(OvershootInterpolator())
}

Advanced Step 5

By implementing AnimateViewHolder, you can override preset animation. So, custom animation can be set depending on view holder.

class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView), AnimateViewHolder {

  override fun preAnimateRemoveImpl(holder: RecyclerView.ViewHolder) {
    // do something
  }

  override fun animateRemoveImpl(holder: RecyclerView.ViewHolder, listener: ViewPropertyAnimatorListener) {
    itemView.animate().apply {
      translationY(-itemView.height * 0.3f)
      alpha(0f)
      duration = 300
      setListener(listener)
    }.start()
  }

  override fun preAnimateAddImpl(holder: RecyclerView.ViewHolder) {
    itemView.setTranslationY(-itemView.height * 0.3f)
    itemView.setAlpha(0f)
  }

  override fun animateAddImpl(holder: RecyclerView.ViewHolder, listener: ViewPropertyAnimatorListener) {
    itemView.animate().apply {
      translationY(0f)
      alpha(1f)
      duration = 300
      setListener(listener)
    }.start()
  }
}

Animators

Cool

LandingAnimator

Scale

ScaleInAnimator, ScaleInTopAnimator, ScaleInBottomAnimator
ScaleInLeftAnimator, ScaleInRightAnimator

Fade

FadeInAnimator, FadeInDownAnimator, FadeInUpAnimator
FadeInLeftAnimator, FadeInRightAnimator

Flip

FlipInTopXAnimator, FlipInBottomXAnimator
FlipInLeftYAnimator, FlipInRightYAnimator

Slide

SlideInLeftAnimator, SlideInRightAnimator, OvershootInLeftAnimator, OvershootInRightAnimator
SlideInUpAnimator, SlideInDownAnimator

RecyclerView.Adapter

Step 1

Set RecyclerView ItemAnimator.

val recyclerView = findViewById<RecyclerView>(R.id.list)
recyclerView.adapter = AlphaInAnimationAdapter(MyAdapter())

Java

RecyclerView recyclerView = findViewById(R.id.list);
recyclerView.setAdapter(new AlphaInAnimationAdapter(MyAdapter());

Advanced Step 2

recyclerView.adapter = AlphaInAnimationAdapter(MyAdapter()).apply {
  // Change the durations.
  setDuration(1000)
  // Change the interpolator.
  setInterpolator(vershootInterpolator())
  // Disable the first scroll mode.
  setFirstOnly(false)
}

Java

AlphaInAnimationAdapter alphaInAnimationAdapter = new AlphaInAnimationAdapter(new MyAdapter());
alphaInAnimationAdapter.setDuration(1000);
alphaInAnimationAdapter.setInterpolator(new OvershootInterpolator());
alphaInAnimationAdapter.setFirstOnly(false);

Advanced Step 3

Multiple Animations

val alphaAdapter = AlphaInAnimationAdapter(MyAdapter())
recyclerView.adapter = ScaleInAnimationAdapter(alphaAdapter)

Java

recyclerView.setAdapter(new ScaleInAnimationAdapter(alphaInAnimationAdapter));

Adapters

Alpha

AlphaInAnimationAdapter

Scale

ScaleInAnimationAdapter

Slide

SlideInBottomAnimationAdapter
SlideInRightAnimationAdapter, SlideInLeftAnimationAdapter

Applications using RecyclerView Animators

Please ping me or send a pull request if you would like to be added here.

Icon	Application
	Ameba Ownd
	QuitNow!
	AbemaTV
	CL

Developed By

Daichi Furiya (Wasabeef) - [email protected]

Contributions

Any contributions are welcome!

Contributers

• craya1982

Thanks

• Inspired by AndroidViewAnimations in daimajia.

License

Copyright 2020 Daichi Furiya / Wasabeef

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.