关于项目取消对RecyclerView没有动画 [英] No animation on item removal on RecyclerView

问题描述

我使用 RecyclerView 首次。一切工作正常，除了有关于项目去除没有动画，即使在项目除了动画作品就好。

I am using RecyclerView for the first time. Everything is working fine except that there is no animation on item removal even though the animation on item addition works just fine.

我没有设置任何自定义项目的动画，但根据文档：

I have not set any custom item animator, but according to the documentation:

动画添加和删除项目中默认 RecyclerView 启用。

Animations for adding and removing items are enabled by default in RecyclerView.

于是就拆除动画应该工作。

So the animations on removal should work.

我想有默认的动画上去除，但无法得到那个工作。

I would like to have the default animation on removal, but can't get that to work.

这是我如何设置RecyclerView：

This is how I setup the RecyclerView:

private void setupRecyclerView() {
  mRecyclerView = (RecyclerView) mRootView.findViewById(R.id.recycler_view);
  mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
  View emptyView = mRootView.findViewById(R.id.empty_view);
  mAdapter = new RoutineAdapter(getActivity(), mRoutineItems, emptyView);
  mRecyclerView.setAdapter(mAdapter);
}

这是我的适配器：

private class RoutineAdapter
      extends RecyclerView.Adapter<RoutineAdapter.ViewHolder> {

private final Context mContext;
private List<RoutineItem> mData;
private View mEmptyView;

    public RoutineAdapter(Context context, List<RoutineItem> data, View emptyView) {
      mContext = context;
      mData = data;
      mEmptyView = emptyView;
      setEmptyViewVisibility();
    }

    public void add(RoutineItem routineItem, int position) {
      mData.add(position, routineItem);
      setEmptyViewVisibility();
      notifyItemInserted(position);
    }

    public void remove(int position){
      mData.remove(position);
      setEmptyViewVisibility();
      notifyItemRemoved(position);
    }

    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      final View view = LayoutInflater.from(mContext).inflate(
          R.layout.fragment_routines_list_item, parent, false);
      return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
      final RoutineItem routineItem = getItem(position);
      holder.circle.setBackgroundResource(
          colorNumberToDrawableResource(routineItem.colorNumber));
      holder.initial.setText(routineItem.routineName.substring(0, 1));
      holder.routineName.setText(routineItem.routineName);
      holder.lastTimeDone.setText(routineItem.lastTimeDoneText);
      if (routineItem.isSelected) {
        holder.itemView.setBackgroundColor(
            getResources().getColor(R.color.background_item_selected));
      } else {
        holder.itemView.setBackgroundResource(
            R.drawable.darker_background_on_pressed);
      }
      holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          mPresenter.onRoutineClicked(routineItem.routineName);
        }
      });
      holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
          mPresenter.onRoutineLongClicked(routineItem.routineName);
          return true;
        }
      });
    }

    @Override
    public int getItemCount() {
      return mData.size();
    }

    public RoutineItem getItem(int position) {
      return mData.get(position);
    }

    private void setEmptyViewVisibility() {
      if (getItemCount() == 0) {
        mEmptyView.setVisibility(View.VISIBLE);
      } else {
        mEmptyView.setVisibility(View.GONE);
      }
    }

    class ViewHolder extends RecyclerView.ViewHolder {
      public final View circle;
      public final TextView initial;
      public final TextView routineName;
      public final TextView lastTimeDone;

      public ViewHolder(View view) {
        super(view);
        circle = view.findViewById(R.id.circle);
        initial = (TextView) view.findViewById(R.id.initial);
        routineName = (TextView) view.findViewById(R.id.routine_name);
        lastTimeDone = (TextView) view.findViewById(R.id.last_time_done);
      }
    }
}

Fragment_routines_list_item.xml：

Fragment_routines_list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:minHeight="@dimen/standard_list_item_height"
  android:paddingBottom="8dp"
  android:background="@drawable/darker_background_on_pressed"
  android:clickable="true">
    ......
</RelativeLayout>

我在做什么错，导致默认清除动画不能正常工作？

What am I doing wrong that causes the default removal animation to not work?

推荐答案

解决了这个问题。

的问题是，在调用后 mAdapter.remove（位置），我的code另一部分叫 mAdapter.notifyDataSetChanged（ ）我以为停止拆除动画。

The issue was that, after calling mAdapter.remove(position), another part of my code was calling mAdapter.notifyDataSetChanged() which I assume stops the removal animation.

综上所述，如果你调用 mAdapter.notifyDataSetChanged 同时有一个动画正在进行的动画将停止。

To sum up, if you call mAdapter.notifyDataSetChanged while there is an animation ongoing the animation will stop.

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