Android Realm RecyclerView动画不起作用？

Question

我有一个由< code > RealmRecyclerViewAdapter 填充的< code > recycle view ,但不知何故，当数据更改时，没有动画播放。adapter类为不同的布局使用多个< code > view holder ,但这不应该影响动画，对吗？

public class DiaryPageEntryAdapter extends RealmRecyclerViewAdapter<Entry, RecyclerView.ViewHolder> {

      static class MealEntryViewHolder extends RecyclerView.ViewHolder {
              @BindView(R.id.item_diary_entry_drink_title) TextView tvMealEntryTitle;
              @BindView(R.id.item_diary_entry_meal_time) TextView tvMealEntryTime;
              BindView(R.id.item_diary_entry_meal_bullet_list) RecyclerView rvBulletList;

         MealEntryBulletAdapter bulletAdapter;

        public MealEntryViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            this.bulletAdapter = new MealEntryBulletAdapter();
            rvBulletList.setLayoutManager(new LinearLayoutManager(itemView.getContext()));
            rvBulletList.setAdapter(this.bulletAdapter);
        }

        void bindData(MealEntry mealEntry) {
            tvMealEntryTitle.setText(mealEntry.getTitle());
            tvMealEntryTime.setText(DateTimeUtils.timeValueToText(itemView.getContext(), mealEntry.getTime()));
            this.bulletAdapter.updateData(mealEntry.getConsumedMeals() ,mealEntry.getConsumedDrinks());
        }
    }

 // Other ViewHolders

    public DiaryPageEntryAdapter(@Nullable OrderedRealmCollection<Entry> data, boolean autoUpdate) {
        super(data, autoUpdate, true);
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case MEAL_ENTRY:
                // Inflate meal entry layout and then create a new meal view holder with it
                View rowMeal = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_diary_entry_meal, parent, false);
                return new MealEntryViewHolder(rowMeal);
           // Other case options.
         }

@Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        Entry entry = getItem(position);

        if(Entry.isMealEntry(entry)) {
            MealEntryViewHolder mealHolder = (MealEntryViewHolder) holder;
            mealHolder.bindData(Entry.getMealEntryFromEntry(entry));
        }
    // Other if branches.
  }

@Override
    public int getItemViewType(int position) {
        Entry entry = getItem(position);

        if(Entry.isMealEntry(entry)) return MEAL_ENTRY;
      // Other if branches.
     }

用于设置 RecyclerView 和适配器的代码如下所示：

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.frag_diary_page_rv_entries);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        entryAdapter = new DiaryPageEntryAdapter(null, true);
        recyclerView.setAdapter(entryAdapter);

将数据绑定到适配器的代码如下所述：

RealmResults<Entry> sortedEntries = diaryEntry.getEntries()
                .where()
                .findAllSortedAsync("time");

entryAdapter.updateData(sortedEntries);

自动更新工作正常，但不知何故没有数据更改时没有动画。一个新条目只是出现，但没有动画。此外，我希望在首次填充回收器视图后播放一个简短的动画-类似于[http://anthony-skr.com/article/recyclerview-items-animation-with-rebound-effect][1]的入口动画。

注意：在我的应用程序版本中。格雷德尔锉刀

dependencies {
// Other dependencies
compile 'io.realm:android-adapters:2.1.0'
}

在 Project build.gradle 文件中：

dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'
        classpath "io.realm:realm-gradle-plugin:3.1.4"
}

Answer 1

从代码示例中，不容易看出从哪里调用< code > entry adapter . update date()，但是在每次更新时连续调用此方法将禁用所有动画，因为它只调用< code > notifyDataSetChanged()。

更标准的模式应该是这样的:

RealmResults<Entry> sortedEntries = diaryEntry.getEntries()
                .where()
                .findAllSortedAsync("time");
entryAdapter = new DiaryPageEntryAdapter(sortedEntries, true);
recyclerView.setAdapter(entryAdapter);

如果执行上述操作，动画应该可以工作。