带有本地数据排序和筛选的RecyclerView Adapter

类主体:

/** * Created by XQ Yang on 2017-3-8 15:30:05 * Description : 带有搜索和排序功能的adapter */ public abstract class SortFilterRVAdapter<ITEMBEAN extends SortBean> extends BaseRecyclerViewAdapter<ITEMBEAN> implements MyFilterable<ITEMBEAN> { private static Comparator<SortBean> sCreateTImeComparator; private static Comparator<SortBean> sFollowTimeComparator; private static Comparator<SortBean> sCreateTImeComparatorDesc; private static Comparator<SortBean> sFollowTimeComparatorDesc; protected List<ITEMBEAN> searchCache; protected List<ITEMBEAN> sortCache; public static final int SORT_CREATE_TIME = 102; public static final int SORT_CREATE_TIME_DESC = 103; public static final int SORT_LAST_FOLLOW_TIME = 100; public static final int SORT_LAST_FOLLOW_TIME_DESC = 101; public static final int SORT_RECOVER = -1; private Comparator<? super ITEMBEAN> comparator; static { sCreateTImeComparator = (o1, o2) -> (TextUtils.isEmpty(o1.getCreateTime()) || TextUtils.isEmpty(o2.getCreateTime()) ? 0 : (o1.getCreateTime().compareTo( o2.getCreateTime()))); sFollowTimeComparator = (o1, o2) -> (TextUtils.isEmpty(o1.getFollowupTime()) || TextUtils.isEmpty(o2.getFollowupTime()) ? 0 : (o1.getFollowupTime().compareTo( o2.getFollowupTime()))); sCreateTImeComparatorDesc = (o1, o2) -> (TextUtils.isEmpty(o1.getCreateTime()) || TextUtils.isEmpty(o2.getCreateTime()) ? 0 : (o2.getCreateTime().compareTo( o1.getCreateTime()))); sFollowTimeComparatorDesc = (o1, o2) -> (TextUtils.isEmpty(o1.getFollowupTime()) || TextUtils.isEmpty(o2.getFollowupTime()) ? 0 : (o2.getFollowupTime().compareTo( o1.getFollowupTime()))); } @IntDef( { SORT_CREATE_TIME, SORT_CREATE_TIME_DESC, SORT_LAST_FOLLOW_TIME, SORT_LAST_FOLLOW_TIME_DESC, SORT_RECOVER }) @Retention(RetentionPolicy.SOURCE) public @interface SortType { } public SortFilterRVAdapter(Activity context, List<ITEMBEAN> list) { super(context, list); searchCache = new ArrayList<>(); searchCache.addAll(list); } public SortFilterRVAdapter(Activity context) { super(context); comparator = sCreateTImeComparator; searchCache = new ArrayList<>(); } /** * 替换数据和搜索的缓存 新建adapter数据为空 后获取到数据时使用 */ public void addDataAndCache(List<ITEMBEAN> list) { replaceDatas(list); searchCache.clear(); searchCache.addAll(list); } @Override public void replaceDatas(List<ITEMBEAN> datas) { if (searchCache != null) { searchCache.clear(); } super.replaceDatas(datas); } @Override public void addDatas(List<ITEMBEAN> datas) { mAdapterListData.addAll(datas); if (searchCache == null) { searchCache = new ArrayList<>(); } searchCache.addAll(datas); notifyDataSetChanged(); } @Override public Filter getFilter() { return new Filter() { @Override protected FilterResults performFiltering(CharSequence constraint) { //初始化过滤结果对象 FilterResults results = new FilterResults(); final ArrayList<ITEMBEAN> newValues = new ArrayList<ITEMBEAN>(); //关键字为空的时候，搜索结果为复制的结果 if (constraint == null || constraint.length() == 0) { results.count = 0; } else { String prefixString = constraint.toString(); final int count = searchCache.size(); //用于存放暂时的过滤结果 for (int i = 0; i < count; i++) { final ITEMBEAN value = searchCache.get(i); if (filterValue(value, prefixString)) { newValues.add(value); } } results.count = newValues.size(); } results.values = newValues; return results;//过滤结果 } @Override protected void publishResults(CharSequence constraint, FilterResults results) { showSearchResult((List<ITEMBEAN>) results.values); } }; } /** * 是否添加到结果中? * * @return true 添加 */ protected abstract boolean filterValue(ITEMBEAN value, String prefixString); /** * 显示搜索结果 * * @param values 传null的话显示本来的数据(整个列表) */ public void showSearchResult(List<ITEMBEAN> values) { mAdapterListData.clear(); if (values == null) { mAdapterListData.addAll(searchCache); } else { mAdapterListData.addAll(values); } notifyDataSetChanged(); } /** * 进行排序 */ public void sort(@SortType int type) { if (sortCache == null) { sortCache = new ArrayList<>(); sortCache.addAll(mAdapterListData); } if (type == SORT_RECOVER) { mAdapterListData.addAll(sortCache); notifyDataSetChanged(); return; } if (sortCache.size() != mAdapterListData.size()) { sortCache.clear(); sortCache.addAll(mAdapterListData); } switch (type) { case SORT_CREATE_TIME: comparator = sCreateTImeComparator; break; case SORT_CREATE_TIME_DESC: comparator = sCreateTImeComparatorDesc; break; case SORT_LAST_FOLLOW_TIME_DESC: comparator = sFollowTimeComparatorDesc; break; default://SORT_LAST_FOLLOW_TIME 默认此序 comparator = sFollowTimeComparator; break; } Collections.sort(mAdapterListData, comparator); //for (int i = 0; i < mAdapterListData.size(); i++) { // System.out.println(mAdapterListData.get(i).getCreateTime() + " : " + sortCache.get(i).getCreateTime()); //} notifyDataSetChanged(); } }

辅助接口:

public interface MyFilterable <ITEMBEAN>extends Filterable { void showSearchResult(List<ITEMBEAN> values); } public interface SortBean { String getCreateTime(); String getFollowupTime(); }