android - 如何从 RecyclerView 获取修改后的数据？

Question

我有一个 RecyclerView 来显示随适配器传递的过滤器列表。此列表包含带有 bool 值的项目，用于检查项目是否被按下。我需要将这些数据返回到 Activity 中以获得已检查元素的列表。我怎样才能做到这一点？

RecyclerView 适配器

public class RvFilterAdapter extends BaseQuickAdapter<FilterSelectable, BaseViewHolder> {

    public RvFilterAdapter(int layoutResId, List data) {
        super(R.layout.filter_item, data);
    }

    @Override
    protected void convert(BaseViewHolder viewHolder, FilterSelectable item) {

        int position = viewHolder.getLayoutPosition();

        setupViews(viewHolder, item);
        setupListeners(viewHolder, item);

        Log.e("RV", "position=" + position + " i=" + item.getId() +" name=" + item.getName() + " checked=" + item.isSelected());

    }

    public void setupViews(BaseViewHolder baseViewHolder, FilterSelectable item){

        baseViewHolder
                .setText(R.id.tv_filter_name, item.getName())
                .setChecked(R.id.tbc_filter, item.isSelected())
                .addOnClickListener(R.id.ll_filter_root)
                .addOnClickListener(R.id.tbc_filter);

    }

    public void setupListeners(BaseViewHolder baseViewHolder, final FilterSelectable item){

        baseViewHolder.getView(R.id.tbc_filter).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(v.isSelected()){
                    v.setSelected(false);
                    item.setSelected(false);
                }else{
                    v.setSelected(true);
                    item.setSelected(true);
                }
            }
        });

    }

}

过滤 Activity

RvFilterAdapter filterAdapter = new RvFilterAdapter(this, R.layout.filter_item, filterList);
filterAdapter.openLoadAnimation();
recyclerView.setAdapter(filterAdapter);

我如何修改传递给适配器的 filterList 以保持 Activity 和 RecyclerView 之间的变化？

谢谢

Answer 1

将以下方法添加到您的适配器并在您的 Activity 中使用它，如 adapter.getSelection()

public List<Item> getSelection() {

    List<Item> selectedItems = new ArrayList<>();

    for(Item item: list) {
        if(item.isSelected()) {
           selectedItems.add(item);
        }
    }
    return selectedItems;
}