• 先上图
  

• 布局文件

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.simple.headview.MainActivity">

    <se.emilsjolander.stickylistheaders.StickyListHeadersListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</RelativeLayout>

• Activity类

public class MainActivity extends AppCompatActivity
{
    

    private StickyListHeadersListView lv;
    private HeadAdapter adapter;
    private List<ItemBeam> list;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (StickyListHeadersListView) findViewById(R.id.lv);
        //添加数据
        list = new ArrayList<ItemBeam>();
        for (int i = 0; i < 10; i++)
        {
            ItemBeam bean = new ItemBeam();
            bean.setValue("bb");
            list.add(bean);
        }
        for (int i = 0; i < 10; i++)
        {
            ItemBeam bean = new ItemBeam();
            bean.setValue("aa");
            list.add(bean);
        }
        for (int i = 0; i < 13; i++)
        {
            ItemBeam bean = new ItemBeam();
            bean.setValue("dd");
            list.add(bean);
        }
        for (int i = 0; i < 17; i++)
        {
            ItemBeam bean = new ItemBeam();
            bean.setValue("cc");
            list.add(bean);
        }
        //设置id，为了能够获取head的id
        int headId = 0;
        Map<String, Integer> map = new HashMap<>();
        for (ItemBeam bean2 : list)
        {
            String value = bean2.getValue();
            if (!map.containsKey(value))//如果这个实体对象在map里面没有这个value对应的key，就给实体对象
            {                           //设置id，并存到map中
                bean2.setId(headId);
                map.put(value, headId);
                headId++;
            } else
            {
   //如果有就直接设置id，这样不同的实体对象就对应不同的id
                bean2.setId(map.get(value));
            }
        }
        //排序
        Collections.sort(list, new Comparator<ItemBeam>()
        {
            @Override
            public int compare(ItemBeam lhs, ItemBeam rhs)
            {
                return lhs.getValue().compareTo(rhs.getValue());
            }
        });
        adapter = new HeadAdapter(this, list);
        lv.setAdapter(adapter);
    }
}

• 适配器类

public class HeadAdapter extends BaseAdapter implements StickyListHeadersAdapter
{
    
    private Context ctx;
    private List<ItemBeam> list;

    public HeadAdapter(Context context , List<ItemBeam> list){
        this.ctx = context;
        this.list = list;
    }
    //初始化head布局，这里只是为了实现功能，项目中还是要用ViewHolder封装下更节约资源
    @Override
    public View getHeaderView(int position, View convertView, ViewGroup parent)
    {
        TextView tv = new TextView(ctx);
        tv.setText(list.get(position).getValue());
        tv.setBackgroundColor(Color.RED);
        return tv;
    }
    //获取headView的id
    @Override
    public long getHeaderId(int position)
    {
        return list.get(position).getId();
    }

    @Override
    public int getCount()
    {
        return list.size();
    }

    @Override
    public Object getItem(int position)
    {
        return list.get(position);
    }

    @Override
    public long getItemId(int position)
    {
        return position;
    }
    //这里只是为了实现功能，项目中还是要用ViewHolder封装下更节约资源
    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        TextView tv = new TextView(ctx);
        tv.setText(list.get(position).getValue());
        return tv;
    }
}

• 实体类

public class ItemBeam
{
    private String value;
    private int id;

    public void setId(int id)
    {
        this.id = id;
    }

    public void setValue(String value)
    {
        this.value = value;
    }

    public String getValue()
    {
        return value;
    }

    public int getId()
    {
        return id;
    }
}