ItemDragHelperCallback.java

package name.caiyao.microreader.ui.helper;

import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.helper.ItemTouchHelper;

/**
 * Created by 蔡小木 on 2016/4/28 0028.
 */
public class ItemDragHelperCallback extends ItemTouchHelper.Callback {

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags;
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if (manager instanceof GridLayoutManager || manager instanceof StaggeredGridLayoutManager) {
            dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
        } else {
            dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        }
        // 如果想支持滑动(删除)操作, swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END
        int swipeFlags = 0;
        return makeMovementFlags(dragFlags, swipeFlags);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        // 不同Type之间不可移动
        if (viewHolder.getItemViewType() != target.getItemViewType()) {
           // return false;
        }

        if (recyclerView.getAdapter() instanceof OnItemMoveListener) {
            OnItemMoveListener listener = ((OnItemMoveListener) recyclerView.getAdapter());
            listener.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
        }
        return true;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

    }

    @Override
    public boolean isLongPressDragEnabled() {
        // 不支持长按拖拽功能 手动控制
        return false;
    }

    @Override
    public boolean isItemViewSwipeEnabled() {
        // 不支持滑动功能
        return false;
    }
}