ItemTouchHelperCallback.java

package com.bigfat.itemtouchhelperdemo;

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

public class ItemTouchHelperCallback extends ItemTouchHelper.Callback {
    private final ItemTouchHelperAdapter mItemTouchHelperAdapter;
    private int mDraggedPosition;
    private int mTargetPosition;

    ItemTouchHelperCallback(ItemTouchHelperAdapter itemTouchHelperAdapter) {
        mItemTouchHelperAdapter = itemTouchHelperAdapter;
    }

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
        return makeMovementFlags(dragFlags, 0);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder
            target) {
        mDraggedPosition = viewHolder.getAdapterPosition();
        mTargetPosition = target.getAdapterPosition();
//                mItemTouchHelperAdapter.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
        return false;
    }

    @Override
    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
        super.onSelectedChanged(viewHolder, actionState);
        switch (actionState) {
            case ItemTouchHelper.ACTION_STATE_DRAG:
                mItemTouchHelperAdapter.onDragStarted();
                break;

            case ItemTouchHelper.ACTION_STATE_IDLE:
                mItemTouchHelperAdapter.onItemMove(mDraggedPosition, mTargetPosition);
//                mItemTouchHelperAdapter.onDragEnded();
                break;
        }
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        mItemTouchHelperAdapter.onItemDismiss(viewHolder.getAdapterPosition());
    }

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

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