欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  移动技术

Android-仿“抖音”的评论列表的UI和效果

程序员文章站 2022-05-12 23:37:59
在design包里面 有一个 BottomSheetDialogFragment 这个Fragment,他已经帮我们处理好了手势,所以实现起来很简单。下面是代码: ......

在design包里面 有一个 BottomSheetDialogFragment 这个Fragment,他已经帮我们处理好了手势,所以实现起来很简单。下面是代码:

public class ItemListDialogFragment extends BottomSheetDialogFragment {

    // TODO: Customize parameter argument names
    private static final String ARG_ITEM_COUNT = "item_count";
    private Listener mListener;

    // TODO: Customize parameters
    public static ItemListDialogFragment newInstance(int itemCount) {
        final ItemListDialogFragment fragment = new ItemListDialogFragment();
        final Bundle args = new Bundle();
        args.putInt(ARG_ITEM_COUNT, itemCount);
        fragment.setArguments(args);
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // 在这里将view的高度设置为精确高度,即可屏蔽向上滑动不占全屏的手势。
        View view = inflater.inflate(R.layout.fragment_item_list_dialog, container, false);
        view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ScreenUtils.getScreenHeight(getActivity()) / 3 * 2));
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        final RecyclerView recyclerView = (RecyclerView) view;
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        recyclerView.setAdapter(new ItemAdapter(getArguments().getInt(ARG_ITEM_COUNT)));
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        final Fragment parent = getParentFragment();
        if (parent != null) {
            mListener = (Listener) parent;
        } else {
            mListener = (Listener) context;
        }
    }

    @Override
    public void onDetach() {
        mListener = null;
        super.onDetach();
    }

    public interface Listener {
        void onItemClicked(int position);
    }

    private class ViewHolder extends RecyclerView.ViewHolder {

        final TextView text;

        ViewHolder(LayoutInflater inflater, ViewGroup parent) {
            // TODO: Customize the item layout
            super(inflater.inflate(R.layout.fragment_item_list_dialog_item, parent, false));
            text = (TextView) itemView.findViewById(R.id.text);
            text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mListener != null) {
                        mListener.onItemClicked(getAdapterPosition());
                        dismiss();
                    }
                }
            });
        }

    }

    private class ItemAdapter extends RecyclerView.Adapter<ViewHolder> {

        private final int mItemCount;

        ItemAdapter(int itemCount) {
            mItemCount = itemCount;
        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.text.setText(String.valueOf(position));
        }

        @Override
        public int getItemCount() {
            return mItemCount;
        }

    }

}