RecycleView的侧拉索引

依赖      compile'com.android.support:recyclerview-v7:23.1.1'

compile 'ca.barrenechea.header-decor:header-decor:0.2.6'
<android.support.v7.widget.RecyclerView  android:id="@+id/id_recyclerview"    android:divider="#ffff0000"    android:dividerHeight="10dp"    android:layout_width="match_parent"    android:layout_height="match_parent" />//字母索引<fan.recyclerviewdemo.QuickIndexBar    android:layout_alignParentRight="true"    android:background="#000"    android:layout_width="36dp"    android:layout_height="match_parent"    android:padding="6dp"    android:id="@+id/qib" />
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public static final String[] NAMES = new String[] { "宋江", "卢俊义", "吴用",            "公孙胜", "关胜", "林冲", "秦明", "呼延灼", "花荣", "柴进", "李应", "朱仝", "鲁智深",            "武松", "董平", "张清", "杨志", "徐宁", "索超", "戴宗", "刘唐", "李逵", "史进", "穆弘",            "雷横", "李俊", "阮小二", "张横", "阮小五", " 张顺", "阮小七", "杨雄", "石秀", "解珍",            " 解宝", "燕青", "朱武", "黄信", "孙立", "宣赞", "郝思文", "韩滔", "彭玘", "单廷珪",            "魏定国", "萧让", "裴宣", "欧鹏", "邓飞", " 燕顺", "杨林", "凌振", "蒋敬", "吕方",            "郭 盛", "安道全", "皇甫端", "王英", "扈三娘", "鲍旭", "樊瑞", "孔明", "孔亮", "项充",            "李衮", "金大坚", "马麟", "童威", "童猛", "孟康", "侯健", "陈达", "杨春", "郑天寿",            "陶宗旺", "宋清", "乐和", "龚旺", "丁得孙", "穆春", "曹正", "宋万", "杜迁", "薛永", "施恩",            "周通", "李忠", "杜兴", "汤隆", "邹渊", "邹润", "朱富", "朱贵", "蔡福", "蔡庆", "李立",            "李云", "焦挺", "石勇", "孙新", "顾大嫂", "张青", "孙二娘", " 王定六", "郁保四", "白胜",            "时迁", "段景柱" };this.rv = (RecyclerView) findViewById(R.id.id_recyclerview);QIBar = (QuickIndexBar) findViewById(R.id.qib);ContactsBean bean;for (int i = 0; i < NAMES.length; i++) {    bean = new ContactsBean(NAMES[i]);    namelist.add(bean);}//对集合进行排序Collections.sort(namelist);//条目间的间隔线DividerDecoration divider = new DividerDecoration.Builder(MainActivity.this)        .setHeight(R.dimen.default_divider_height)        .setPadding(R.dimen.default_divider_padding)        .setColorResource(R.color.colorAccent)        .build();manager = new LinearLayoutManager(MainActivity.this);rv.setHasFixedSize(true);rv.setLayoutManager(manager);rv.addItemDecoration(divider);final ContactsAdapter adapter = new ContactsAdapter(MainActivity.this, namelist);//设置悬浮索引StickyHeaderDecoration decor = new StickyHeaderDecoration(adapter);rv.setAdapter(adapter);rv.addItemDecoration(decor, 1);//侧拉索引改变监听QIBar.setOnLetterChangeListener(new QuickIndexBar.OnLetterChangeListener() {    @Override    public void onLetterChange(String letter) {        for (int i = 0; i < namelist.size(); i++) {            if(letter.equals(namelist.get(i).pinyin.charAt(0) + "")) {                int position = adapter.getPositionForSection(namelist.get(i).pinyin.charAt(0));                if(position != -1){                    //滑动到指定位置                    manager.scrollToPositionWithOffset(position,0);                }                break;            }        }    }    @Override    public void onReset() {    }});RecyclerView只能控制指定的item显示到屏幕上   不保证位置