InstaMaterial source files (comments transitions)

FeedAdapter_animatePhotoLike.java

private void animatePhotoLike(final CellFeedViewHolder holder) {
    if (!likeAnimations.containsKey(holder)) {
        holder.vBgLike.setVisibility(View.VISIBLE);
        holder.ivLike.setVisibility(View.VISIBLE);

        holder.vBgLike.setScaleY(0.1f);
        holder.vBgLike.setScaleX(0.1f);
        holder.vBgLike.setAlpha(1f);
        holder.ivLike.setScaleY(0.1f);
        holder.ivLike.setScaleX(0.1f);

        AnimatorSet animatorSet = new AnimatorSet();
        likeAnimations.put(holder, animatorSet);

        ObjectAnimator bgScaleYAnim = ObjectAnimator.ofFloat(holder.vBgLike, "scaleY", 0.1f, 1f);
        bgScaleYAnim.setDuration(200);
        bgScaleYAnim.setInterpolator(DECCELERATE_INTERPOLATOR);
        ObjectAnimator bgScaleXAnim = ObjectAnimator.ofFloat(holder.vBgLike, "scaleX", 0.1f, 1f);
        bgScaleXAnim.setDuration(200);
        bgScaleXAnim.setInterpolator(DECCELERATE_INTERPOLATOR);
        ObjectAnimator bgAlphaAnim = ObjectAnimator.ofFloat(holder.vBgLike, "alpha", 1f, 0f);
        bgAlphaAnim.setDuration(200);
        bgAlphaAnim.setStartDelay(150);
        bgAlphaAnim.setInterpolator(DECCELERATE_INTERPOLATOR);

        ObjectAnimator imgScaleUpYAnim = ObjectAnimator.ofFloat(holder.ivLike, "scaleY", 0.1f, 1f);
        imgScaleUpYAnim.setDuration(300);
        imgScaleUpYAnim.setInterpolator(DECCELERATE_INTERPOLATOR);
        ObjectAnimator imgScaleUpXAnim = ObjectAnimator.ofFloat(holder.ivLike, "scaleX", 0.1f, 1f);
        imgScaleUpXAnim.setDuration(300);
        imgScaleUpXAnim.setInterpolator(DECCELERATE_INTERPOLATOR);

        ObjectAnimator imgScaleDownYAnim = ObjectAnimator.ofFloat(holder.ivLike, "scaleY", 1f, 0f);
        imgScaleDownYAnim.setDuration(300);
        imgScaleDownYAnim.setInterpolator(ACCELERATE_INTERPOLATOR);
        ObjectAnimator imgScaleDownXAnim = ObjectAnimator.ofFloat(holder.ivLike, "scaleX", 1f, 0f);
        imgScaleDownXAnim.setDuration(300);
        imgScaleDownXAnim.setInterpolator(ACCELERATE_INTERPOLATOR);

        animatorSet.playTogether(bgScaleYAnim, bgScaleXAnim, bgAlphaAnim, imgScaleUpYAnim, imgScaleUpXAnim);
        animatorSet.play(imgScaleDownYAnim).with(imgScaleDownXAnim).after(imgScaleUpYAnim);

        animatorSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                resetLikeAnimationState(holder);
            }
        });
        animatorSet.start();
    }
}

FeedAdapter_updateHeartButton.java

private void updateHeartButton(final CellFeedViewHolder holder, boolean animated) {
    if (animated) {
        if (!likeAnimations.containsKey(holder)) {
            AnimatorSet animatorSet = new AnimatorSet();
            likeAnimations.put(holder, animatorSet);

            ObjectAnimator rotationAnim = ObjectAnimator.ofFloat(holder.btnLike, "rotation", 0f, 360f);
            rotationAnim.setDuration(300);
            rotationAnim.setInterpolator(ACCELERATE_INTERPOLATOR);

            ObjectAnimator bounceAnimX = ObjectAnimator.ofFloat(holder.btnLike, "scaleX", 0.2f, 1f);
            bounceAnimX.setDuration(300);
            bounceAnimX.setInterpolator(OVERSHOOT_INTERPOLATOR);

            ObjectAnimator bounceAnimY = ObjectAnimator.ofFloat(holder.btnLike, "scaleY", 0.2f, 1f);
            bounceAnimY.setDuration(300);
            bounceAnimY.setInterpolator(OVERSHOOT_INTERPOLATOR);
            bounceAnimY.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationStart(Animator animation) {
                    holder.btnLike.setImageResource(R.drawable.ic_heart_red);
                }
            });

            animatorSet.play(rotationAnim);
            animatorSet.play(bounceAnimX).with(bounceAnimY).after(rotationAnim);

            animatorSet.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    resetLikeAnimationState(holder);
                }
            });

            animatorSet.start();
        }
    } else {
        if (likedPositions.contains(holder.getPosition())) {
            holder.btnLike.setImageResource(R.drawable.ic_heart_red);
        } else {
            holder.btnLike.setImageResource(R.drawable.ic_heart_outline_grey);
        }
    }
}

FeedAdapter_updateLikesCounter.java

private void updateLikesCounter(CellFeedViewHolder holder, boolean animated) {
    int currentLikesCount = likesCount.get(holder.getPosition()) + 1;
    String likesCountText = context.getResources().getQuantityString(
            R.plurals.likes_count, currentLikesCount, currentLikesCount
    );

    if (animated) {
        holder.tsLikesCounter.setText(likesCountText);
    } else {
        holder.tsLikesCounter.setCurrentText(likesCountText);
    }

    likesCount.put(holder.getPosition(), currentLikesCount);
}

item_feed_likes_counter.xml

<!--...-->
<LinearLayout
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:gravity="center_vertical|right">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_heart_small_blue" />

    <TextSwitcher
        android:id="@+id/tsLikesCounter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:inAnimation="@anim/slide_in_likes_counter"
        android:outAnimation="@anim/slide_out_likes_counter">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="123 likes"
            android:textColor="@color/text_like_counter" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/text_like_counter" />
    </TextSwitcher>
</LinearLayout>
<!--...-->