java – RecylerView没有动画插入,但它确实动画删除

因此,当我添加一个项目时,它不会为其设置动画,也不会滚动到正确的位置.但是,当我删除某些内容时,它将为对象移除设置动画.

这是添加代码:

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == NEWITEMREQUESTCODE && resultCode == Activity.RESULT_OK) {
            // AFTER CREATING A NEW ITEM
            OilChangeableItem oilChangeableItem = data.getParcelableExtra("oil_item");
            // Add the new item and notify the dataset.
            oilChangeableAdapter.notifyItemInserted(0);
            items.add(0, oilChangeableItem);
        } else if (requestCode == EDITITEMRESULTCODE && resultCode == Activity.RESULT_OK) {
            // AFTER EDITING AN ITEM
            OilChangeableItem oilChangeableItem = data.getParcelableExtra("oil_item");
            // Replace the existing item at whatever position it was originally at and notify the dataset.
            oilChangeableAdapter.notifyItemChanged(data.getIntExtra("item_position", 0));
            items.set(data.getIntExtra("item_position", 0), oilChangeableItem);
        }
    }

这是删除代码:

final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                    builder.setTitle(R.string.dialog_delete_title);
                    builder.setIcon(R.drawable.ic_action_warning);
                    builder.setMessage(R.string.dialog_delete_message);

                    builder.setPositiveButton(R.string.button_text_delete, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // Removed the selected item
                            oilChangeableAdapter.notifyItemRemoved(oilChangeableAdapter.getSelectedViewPosition());
                            items.remove(oilChangeableAdapter.getSelectedViewPosition());
                            // Notify the user it has been removed.
                            Toast.makeText(getActivity(), R.string.toast_item_deleted, Toast.LENGTH_SHORT).show();
                        }
                    });
                    builder.setNegativeButton(R.string.button_text_cancel, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });
                builder.create();
                builder.show();
                mode.finish();

有没有人有任何想法?

这是因为您要在当前可见项目“上方”添加项目.

我理解这看起来很意外,如果你考虑第一个位置,但如果RV显示5到10的项目并且在位置2添加了新项目,你真的不希望你的列表移动到4到9.

所以LinearLayoutManager保持这个简单,如果在列表的上方或下方添加一个项目,它就不会移动(这样UX就是一致的).

如果您希望在将项目添加到位置0时显示位置0,请致电
添加项目后,recyclelerView.scrollToPosition(0).我觉得你真正想要的是:

items.add(0, oilChangeableItem);    
oilChangeableAdapter.notifyItemInserted(0);
if (layoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
    layoutManager.scrollToPosition(0);
}
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