卡片视图自动计数

Question

我正在尝试制定一种方法，如果卡 position == 0 然后 viewHolder.mPostSortNum.setText("1");" 并且如果 position == 1 然后 viewHolder.mPostSortNum.setText("2"); 但是我想对所有的问题进行编号自动卡片，因为这些方法仅包含位置 0,1，所以我需要一种方法来自动按位置对所有卡片进行编号。

这是我的 activity 方法：

FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder>(
            Getting_Posts.class, R.layout.post_card_design, PostViewHolder.class, mDatabase) {
        @Override
        protected void populateViewHolder(final PostViewHolder viewHolder, final Getting_Posts model, int position) {

            viewHolder.setUsername(model.getUsername());
            viewHolder.setProfile(getActivity().getApplicationContext(), model.getProfile());
            viewHolder.setDescribe(model.getDescribe());
            viewHolder.setWallpaper(getActivity().getApplicationContext(), model.getWallpaper());

            //heres my methods but its for 3 cards only
            if (position==0){viewHolder.mPostSortNum.setText("1");}
            if (position==1){viewHolder.mPostSortNum.setText("2");}
            if (position==2){viewHolder.mPostSortNum.setText("3");}
        }

    };

    mPostList.setAdapter(firebaseRecyclerAdapter);}

Answer 1

position 总是比实际数字少一，因为索引总是从 0 开始。每次调用 viewHolder.mPostSortNum.setText(""); 时只需使用 position + 1。

 FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder>(
        Getting_Posts.class, R.layout.post_card_design, PostViewHolder.class, mDatabase) {
    @Override
    protected void populateViewHolder(final PostViewHolder viewHolder, final Getting_Posts model, int position) {

        viewHolder.setUsername(model.getUsername());
        viewHolder.setProfile(getActivity().getApplicationContext(), model.getProfile());
        viewHolder.setDescribe(model.getDescribe());
        viewHolder.setWallpaper(getActivity().getApplicationContext(), model.getWallpaper());

        viewHolder.mPostSortNum.setText(String.valueOf(position + 1));

    }

};

mPostList.setAdapter(firebaseRecyclerAdapter);}