SlideItemAnimator

SlideItemAnimator.java

package dk.shape.goboat.animation.animators;

import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;

import dk.shape.goboat.animation.utils.AnimUtils;
import dk.shape.goboat.animation.utils.SimpleAnimatorListener;

//
// SlideItemAnimator
// GoBoat
//
// Created by Ben De La Haye on 13/01/2017.
// Copyright (c) 2017 SHAPE A/S. All rights reserved.
//
public class SlideItemAnimator extends DefaultItemAnimator {

    @Override
    public boolean canReuseUpdatedViewHolder(RecyclerView.ViewHolder viewHolder) {
        return false;
    }

    @Override
    public boolean animateDisappearance(@NonNull RecyclerView.ViewHolder viewHolder, @NonNull ItemHolderInfo preLayoutInfo, @Nullable ItemHolderInfo postLayoutInfo) {

        ObjectAnimator slideAnimator = ObjectAnimator.ofFloat(viewHolder.itemView, "translationX", -viewHolder.itemView.getWidth());
        ObjectAnimator fadeAnimator = ObjectAnimator.ofInt(viewHolder.itemView, "alpha", 0);

        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(slideAnimator, fadeAnimator);
        animatorSet.setDuration(200);
        fadeAnimator.setInterpolator(AnimUtils.getExitInterpolator());
        animatorSet.addListener(new SimpleAnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animation) {
                dispatchAnimationFinished(viewHolder);
                dispatchRemoveFinished(viewHolder);
            }
        });
        animatorSet.start();
        dispatchRemoveStarting(viewHolder);

        return true;
    }

    @Override
    public boolean animateAppearance(@NonNull RecyclerView.ViewHolder viewHolder, @Nullable ItemHolderInfo preLayoutInfo, @NonNull ItemHolderInfo postLayoutInfo) {

        ObjectAnimator fadeAnimator = ObjectAnimator.ofInt(viewHolder.itemView, "alpha", 0, 1);
        fadeAnimator.setDuration(200);
        fadeAnimator.setInterpolator(AnimUtils.getEnterInterpolator());
        fadeAnimator.addListener(new SimpleAnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animation) {
                dispatchAnimationFinished(viewHolder);
                dispatchAddFinished(viewHolder);
            }
        });
        fadeAnimator.start();
        dispatchAddStarting(viewHolder);

        return true;
    }

    @Override
    public boolean animateMove(RecyclerView.ViewHolder holder, int fromX, int fromY, int toX, int toY) {

        final View view = holder.itemView;

        fromX += ViewCompat.getTranslationX(view);
        fromY += ViewCompat.getTranslationY(view);

        int deltaX = toX - fromX;
        int deltaY = toY - fromY;
        if (deltaX == 0 && deltaY == 0) {
            dispatchMoveFinished(holder);
            return false;
        }

        if (deltaX != 0) {
            ViewCompat.setTranslationX(view, -deltaX);
        }
        if (deltaY != 0) {
            ViewCompat.setTranslationY(view, -deltaY);
        }

        ObjectAnimator horizontalSlideAnimator = ObjectAnimator.ofFloat(view, "translationX", 0);
        ObjectAnimator verticalSlideAnimator = ObjectAnimator.ofFloat(view, "translationY", 0);

        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(horizontalSlideAnimator, verticalSlideAnimator);
        animatorSet.setStartDelay(200);
        animatorSet.setDuration(300);
        animatorSet.setInterpolator(new AccelerateDecelerateInterpolator());
        animatorSet.addListener(new SimpleAnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
                dispatchMoveStarting(holder);
            }

            @Override
            public void onAnimationEnd(Animator animation) {
                dispatchAnimationFinished(holder);
                dispatchMoveFinished(holder);
            }
        });
        animatorSet.start();

        return true;
    }
}