//移动拖拽
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
//同来设置 拖拽移动，或移动删除
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int swiped = ItemTouchHelper.RIGHT | ItemTouchHelper.LEFT;
int dragFlags = 0;
//这里为什么要这么写？因为在 线性布局的时候一般是不需要刻意左右拖动
//所以在这里需要判断一下，是不是网格布局。是的话就可以上下左右一起拖动。
if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.RIGHT | ItemTouchHelper.LEFT;
} else {
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
}
//第一个参数拖动，第二个删除侧滑
return makeMovementFlags(dragFlags, swiped);
}
//在拖动中不断的回调这个方法
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
int oldPosition = viewHolder.getAdapterPosition();
int newPosition = target.getAdapterPosition();
if (oldPosition < newPosition) {
for (int i = oldPosition; i < newPosition; i++) {
// 改变实际的数据集
Collections.swap(listData, i, i + 1);
}
} else {
for (int i = oldPosition; i > newPosition; i--) {
// 改变实际的数据集
Collections.swap(listData, i, i - 1);
}
}
mAdapter.notifyItemMoved(oldPosition, newPosition);
return true;
}
//处理侧滑
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
listData.remove(position);
mAdapter.notifyItemRemoved(position);
}
});
itemTouchHelper.attachToRecyclerView(recycler_view_fenlei_yidong_item);
