android gridview布局添加多个title

在项目中要求实现在gridview的布局效果上添加title,并且是多个在不同地方的title,每个title占据一整行,下面分享一下如何实现

先上效果图:

1.首先添加title到list集合中:

 List ls;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RecyclerView rl = (RecyclerView) findViewById(R.id.myrv);        final GridLayoutManager manager = new GridLayoutManager(this,2);        rl.setLayoutManager(manager);        ls = new ArrayList<>();        for(int i = 0 ; i< 100 ; i ++){            ls.add(i + "");        }        MyAdapter myAdapter = new MyAdapter();        myAdapter.addTitle(7,"呵呵哒");        myAdapter.addTitle(11,"萌萌哒");        myAdapter.addTitle(20,"饿饿哒");        rl.setAdapter(myAdapter);    }

2.在recyclerview复写的oncreateviewholder判断类型,是否是title,是的话就创建title的自定义view

        public SparseArray titles = new SparseArray<>();        @Override        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {            if(isTitle(viewType)){                View v = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_title,parent,false);                TitleViewHolder titleViewHolder = new TitleViewHolder(v);                return titleViewHolder;            }else{                View v = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_test,parent,false);                MyViewHolder myViewHolder = new MyViewHolder(v);                return myViewHolder;            }        }

3.复写adapter中的getviewtype方法

        @Override        public int getItemViewType(int position) {            if(isTitle(position)){                return position;            }            return super.getItemViewType(position);        }

4.复写onbindviewholder,对不同类型的view进行绑定数据操作

@Override        public void onBindViewHolder(RecyclerView.ViewHolder holder,int position) {            if(isTitle(position)){                TitleViewHolder titleViewHolder = (TitleViewHolder) holder;                titleViewHolder.tv.setText(titles.get(position));                return;            }            //获取空过去的item(关键)            for(int i = 0; i < titles.size(); i++){                int key = titles.keyAt(i);                if(position > titles.keyAt(titles.size() - 1)){                    position -= titles.size();                    break;                }else if(position > key && position < titles.keyAt(i + 1)){                    position -= (i+1);                    break;                }            }            final int s = position;            MyViewHolder myViewHolder = (MyViewHolder) holder;            myViewHolder.tv.setText(ls.get(s));            myViewHolder.tv.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    Toast.makeText(MainActivity.this,"您点击了" + s,Toast.LENGTH_SHORT).show();                }            });        }

5.复写getitemcount方法重新负值item数量

        public int getItemCount() {            return (ls.size() + titles.size());        }

6.添加两个方法用于判断是否是title,和添加title方法

public boolean isTitle(int position){           return titles.get(position) == null ? false:true;        }        public void addTitle(int position,String title){            titles.put(position,title);        }

7.重点,对title类型进行分配两个单元格处理

 @Override        public void onAttachedToRecyclerView(RecyclerView recyclerView) {            //如果是title就占据2个单元格(重点)            GridLayoutManager manager = (GridLayoutManager) recyclerView.getLayoutManager();            manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {                @Override                public int getSpanSize(int position) {                    if(isTitle(position)){                        return 2;                    }                    return 1;                }            });        }

到此为止就完成了一个可以任意添加title的recyclerview

代码已经上传到github点击查看,如果觉得不错start一下下,有问题可以直接联系我邮箱地址:270259265@qq.com,欢迎交流

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