Question

我正在尝试制作一种方法，如果卡position == 0然后viewHolder.mPostSortNum.setText("1");＆＃34;如果position == 1然后viewHolder.mPostSortNum.setText("2");，但问题是我想自动为所有卡编号，因为这些方法内容位置0,1只是因此我需要一种方法来按位置自动对所有卡进行编号。

这是我的活动方法：

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个，因为索引始终从0开始。每次调用position + 1时都要使用viewHolder.mPostSortNum.setText("");。

 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);}

卡片视图自动计数

1 个答案: