如何使用类ContentQueryMap来缓存游标值?

I read that ContentQueryMap can be used to access Cursor values not to access the db everytime.

我读到ContentQueryMap可以用来访问游标值，而不是每次都访问db。

But, how to use it? The Official Android help is hermetic...

但是，如何使用它呢?官方的Android帮助是密封的…

1 个解决方案

#1

       ContentQueryMap mQueryMap = new ContentQueryMap(cursor, BaseColumns._ID, true, null);

        Comparator<Long> numberAmaxB = new Comparator<Long>() {
            @Override public int compare(Long s1, Long s2) {
                if (s1<s2)
                    return 1;
                else if (s1>s2)
                    return -1;
                else
                    return 0;
            }           
        };
        SortedMap<Long, String> mySortedMap = new TreeMap<Long, String>(numberAmaxB);

        for (Map.Entry<String, ContentValues> row : mQueryMap.getRows().entrySet()) {

            Long _ID = Long.valueOf(row.getKey());
            String data= row.getValue().getAsString("data_column");
         conversationsSortedMap.put(_ID, data);
        }