Android的数据绑定提供了一些可观察到的数据接口，包括ObservableList。但排序列表（在最新版本的RecyclerView库引入）不扩展列表的。

Android data binding provides several Observable data interfaces including ObservableList. But SortedList (introduced in recent version of RecyclerView library) does not extend List at all.

我怎么可以使用排序列表的RecyclerView与Android的数据绑定库？

How could I use SortedList for RecyclerView with Android data binding library?

推荐答案

由乔治·芒启发，我已经从原来的排序列表来实现我的版本ObservableSortedList的全功能，其中包括：

Inspired by George Mount, I have implemented my version of ObservableSortedList with full functionalities from the original SortedList, including:

全部code：

public class ObservableSortedList<T> extends AbstractList<T> implements ObservableList<T> {

  /** @see android.support.v7.util.SortedList.Callback */
  public interface Callback<T2> {
    /** @see android.support.v7.util.SortedList.Callback#compare(Object, Object) */
    int compare(T2 o1, T2 o2);
    /** @see android.support.v7.util.SortedList.Callback#areItemsTheSame(Object, Object) */
    boolean areItemsTheSame(T2 item1, T2 item2);
    /** @see android.support.v7.util.SortedList.Callback#areContentsTheSame(Object, Object) */
    boolean areContentsTheSame(T2 oldItem, T2 newItem);
  }

  public ObservableSortedList(final Class<T> klass, final Callback<T> callback) {
    mList = new SortedList<>(klass, new CallbackWrapper<>(callback));
  }

  /** @see SortedList#beginBatchedUpdates() */
  public void beginBatchedUpdates() { mList.beginBatchedUpdates(); }
  /** @see SortedList#endBatchedUpdates() */
  public void endBatchedUpdates() { mList.endBatchedUpdates(); }

  @Override public boolean add(final T item) {
    sTlsUpdated.set(false);
    mList.add(item);
    return sTlsUpdated.get();   // May be set by Callback.onInserted() or onChanged().
  }

  @Override public T set(final int location, final T object) {
    final T old = mList.get(location);
    mList.updateItemAt(location, cast(object));
    return old;
  }

  @Override public int indexOf(final Object object) {
    try {
      return mList.indexOf(cast(object));
    } catch (final ClassCastException ignored) {
      return -1;
    }
  }

  @Override public boolean remove(final Object object) {
    try {
      return mList.remove(cast(object));
    } catch (final ClassCastException ignored) {
      return false;
    }
  }

  @SuppressWarnings("unchecked") private T cast(final Object object) { return (T) object; }

  @Override public boolean contains(final Object object) { return indexOf(object) != SortedList.INVALID_POSITION; }
  @Override public T get(final int location) { return mList.get(location); }
  @Override public int size() { return mList.size(); }
  @Override public void clear() { mList.clear(); }
  @Override public T remove(final int location) { return mList.removeItemAt(location); }

  /* ObservableList */

  @Override public void addOnListChangedCallback(final OnListChangedCallback<? extends ObservableList<T>> callback) {
    if (mListeners == null) this.mListeners = new ListChangeRegistry();
    mListeners.add(callback);
  }

  @Override public void removeOnListChangedCallback(final OnListChangedCallback<? extends ObservableList<T>> callback) {
    if (mListeners == null) return;
    mListeners.remove(callback);
  }

  private final SortedList<T> mList;
  private static final ThreadLocal<Boolean> sTlsUpdated = new ThreadLocal<>();
  private transient @Nullable ListChangeRegistry mListeners = new ListChangeRegistry();

  public class CallbackWrapper<T2> extends SortedList.Callback<T2> {

    @Override public final void onInserted(final int position, final int count) {
      sTlsUpdated.set(true);
      if (mListeners != null) mListeners.notifyInserted(ObservableSortedList.this, position, count);
    }

    @Override public final void onRemoved(final int position, final int count) {
      if (mListeners != null) mListeners.notifyRemoved(ObservableSortedList.this, position, count);
    }

    @Override public final void onMoved(final int fromPosition, final int toPosition) {
      if (mListeners != null) mListeners.notifyMoved(ObservableSortedList.this, fromPosition, toPosition, 1);
    }

    @Override public final void onChanged(final int position, final int count) {
      sTlsUpdated.set(true);
      if (mListeners != null) mListeners.notifyChanged(ObservableSortedList.this, position, count);
    }

    @Override public int compare(final T2 o1, final T2 o2) { return mCallback.compare(o1, o2); }
    @Override public boolean areContentsTheSame(final T2 oldItem, final T2 newItem) { return mCallback.areContentsTheSame(oldItem, newItem); }
    @Override public boolean areItemsTheSame(final T2 item1, final T2 item2) { return mCallback.areItemsTheSame(item1, item2); }
    public CallbackWrapper(final Callback<T2> callback) { mCallback = callback; }

    private final Callback<T2> mCallback;
  }
}