Android一步步带你在RecyclerView上面实现"拖放"和"滑动删除"功能

 compile 'com.android.support:recyclerview-v7:25.3.0'

getMovementFlags(RecyclerView, ViewHolder)
onMove(RecyclerView, ViewHolder, ViewHolder)
onSwiped(ViewHolder, int)

isLongPressDragEnabled()
isItemViewSwipeEnabled()

@Override
public int getMovementFlags(RecyclerView recyclerView, 
  RecyclerView.ViewHolder viewHolder) {
 int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
 int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
 return makeMovementFlags(dragFlags, swipeFlags);
}

@Override
public boolean isLongPressDragEnabled() {
 return true;
}

@Override
public boolean isItemViewSwipeEnabled() {
 return true;
}

public interface ItemTouchHelperAdapter {
 void onItemMove(int fromPosition, int toPosition);
 void onItemDismiss(int position);
}

public class RecyclerListAdapter extends 
  RecyclerView.Adapter<ItemViewHolder> 
  implements ItemTouchHelperAdapter {
// ... code from gist
@Override
public void onItemDismiss(int position) {
 mItems.remove(position);
 notifyItemRemoved(position);
}
@Override
public boolean onItemMove(int fromPosition, int toPosition) {
 if (fromPosition < toPosition) {
  for (int i = fromPosition; i < toPosition; i++) {
   Collections.swap(mItems, i, i + 1);
  }
 } else {
  for (int i = fromPosition; i > toPosition; i--) {
   Collections.swap(mItems, i, i - 1);
  }
 }
 notifyItemMoved(fromPosition, toPosition);
 return true;
}

private final ItemTouchHelperAdapter mAdapter;
public SimpleItemTouchHelperCallback(
  ItemTouchHelperAdapter adapter) {
 mAdapter = adapter;
}

@Override
public boolean onMove(RecyclerView recyclerView, 
  RecyclerView.ViewHolder viewHolder, 
  RecyclerView.ViewHolder target) {
 mAdapter.onItemMove(viewHolder.getAdapterPosition(), 
   target.getAdapterPosition());
 return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, 
  int direction) {
 mAdapter.onItemDismiss(viewHolder.getAdapterPosition());
}

public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {
 private final ItemTouchHelperAdapter mAdapter;
 public SimpleItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
  mAdapter = adapter;
 }
 @Override
 public boolean isLongPressDragEnabled() {
  return true;
 }
 @Override
 public boolean isItemViewSwipeEnabled() {
  return true;
 }
 @Override
 public int getMovementFlags(RecyclerView recyclerView, ViewHolder viewHolder) {
  int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
  int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
  return makeMovementFlags(dragFlags, swipeFlags);
 }
 @Override
 public boolean onMove(RecyclerView recyclerView, ViewHolder viewHolder, 
   ViewHolder target) {
  mAdapter.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
  return true;
 }
 @Override
 public void onSwiped(ViewHolder viewHolder, int direction) {
  mAdapter.onItemDismiss(viewHolder.getAdapterPosition());
 }
}

ItemTouchHelper.Callback callback = 
 new SimpleItemTouchHelperCallback(adapter);
ItemTouchHelper touchHelper = new ItemTouchHelper(callback);
touchHelper.attachToRecyclerView(recyclerView);