Android remove all recyclerview with animation on a button click

Question

I have a recycler view. On a button click I want to remove all the items from the recyclerview but the items must be removed with animation. I am able to remove all the ite

Answer 1

Extend BaseItemAnimator class of recyclerview-animators library:

MyAdapter adapter = new MyAdapter(null);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setAdapter(adapter);
recyclerView.setItemAnimator(new MyScaleInLeftAnimator());

findViewById(R.id.button).setOnClickListener(
    new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            int count = adapter.getItemCount();
            adapter.clear();
            adapter.notifyItemRangeRemoved(0, count);
        }
    }
);

...

public class MyAdapter extends RecyclerView.Adapter mItems;

    ...

    public void clear() {
        if (mItems != null) {
            mItems.clear();
        }
    }

}

...

public class MyScaleInLeftAnimator extends BaseItemAnimator {

    private long lastRemoval;
    private int removeCount;

    public MyScaleInLeftAnimator() {
        lastRemoval = 0;
        removeCount = 0;
    }

    public MyScaleInLeftAnimator(Interpolator interpolator) {
        mInterpolator = interpolator;
        lastRemoval = 0;
        removeCount = 0;
    }

    @Override protected void preAnimateRemoveImpl(RecyclerView.ViewHolder holder) {
        ViewCompat.setPivotX(holder.itemView, 0);
    }

    @Override protected void animateRemoveImpl(final RecyclerView.ViewHolder holder) {
        long time = System.currentTimeMillis();
        long d = time - lastRemoval;
        if (d < 100) {
            removeCount++;
        } else {
            removeCount = 0;
        }
        lastRemoval = time;
        ViewCompat.animate(holder.itemView)
                .scaleX(0)
                .scaleY(0)
                .setDuration(getRemoveDuration())
                .setInterpolator(mInterpolator)
                .setListener(new DefaultRemoveVpaListener(holder))
                .setStartDelay(removeCount * 100)
                .start();
    }

    @Override protected void preAnimateAddImpl(RecyclerView.ViewHolder holder) {
        ViewCompat.setPivotX(holder.itemView, 0);
        ViewCompat.setScaleX(holder.itemView, 0);
        ViewCompat.setScaleY(holder.itemView, 0);
    }

    @Override protected void animateAddImpl(final RecyclerView.ViewHolder holder) {
        ViewCompat.animate(holder.itemView)
                .scaleX(1)
                .scaleY(1)
                .setDuration(getAddDuration())
                .setInterpolator(mInterpolator)
                .setListener(new DefaultAddVpaListener(holder))
                .setStartDelay(getAddDelay(holder))
                .start();
    }
}