StickyListHeaders：在listview中可以轻松的把headers添加到列表视图中组件

StickyListHeaders：在listview中可以轻松的把headers添加到列表视图中组件

StickyListHeaders 是一个在listview中可以轻松的把headers添加到列表视图中，类似于Android4.0 的手机通讯录的效果。很多IOS 也用这种效果，这个框架也可以用在不动的列表之中.

安装

Maven

    se.emilsjolander
    stickylistheaders
    x.x.x

gradle

dependencies {
    compile  'se.emilsjolander:stickylistheaders:x.x.x'
}

例子

让我们以一个活动或者片段开始，它看起来像这样

    android:id= "@+id/list"
    android:layout_width= "match_parent"
    android:layout_height= "match_parent" />

现在在活动的Oncreate或者片段的Oncreateview 中你要加上以下代码

StickyListHeadersListView stickyList = (StickyListHeadersListView) findViewById(R.id.list);
MyAdapter adapter =  new MyAdapter( this );
stickyList.setAdapter(adapter);

如果你的list是一个国家列表，每个header是字母表中的一个字母

public class MyAdapter  extends BaseAdapter  implements StickyListHeadersAdapter {

    private String [] countries;
    private LayoutInflater inflater;

    public TestBaseAdapter(Context context) {
        inflater = LayoutInflater.from(context);
        countries = context.getResources().getStringArray(R.array.countries);
    }

    @Override
    public int getCount() {
        return countries.length;
    }

    @Override
    public Object getItem( int position) {
        return countries[position];
    }

    @Override
    public long getItemId( int position) {
        return position;
    }

    @Override
    public View getView( int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView ==  null ) {
            holder =  new ViewHolder();
            convertView = inflater.inflate(R.layout.test_list_item_layout, parent,  false );
            holder.text = (TextView) convertView.findViewById(R.id.text);
            convertView.setTag(holder);
        }  else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.text.setText(countries[position]);

        return convertView;
    }

    @Override
    public View getHeaderView( int position, View convertView, ViewGroup parent) {
        HeaderViewHolder holder;
        if (convertView ==  null ) {
            holder =  new HeaderViewHolder();
            convertView = inflater.inflate(R.layout.header, parent,  false );
            holder.text = (TextView) convertView.findViewById(R.id.text);
            convertView.setTag(holder);
        }  else {
            holder = (HeaderViewHolder) convertView.getTag();
        }
        //set header text as first char in name
        String headerText =  "" + countries[position].subSequence( 0 ,  1 ).charAt( 0 );
        holder.text.setText(headerText);
        return convertView;
    }

    @Override
    public long getHeaderId( int position) {
        //return the first character of the country as ID because this is what headers are based upon
        return countries[position].subSequence( 0 ,  1 ).charAt( 0 );
    }

    class HeaderViewHolder {
        TextView text;
    }

    class ViewHolder {
        TextView text;
    }

}

开源地址：https://github.com/emilsjolander/StickyListHeaders