sdk/src/com/socialize/oauth/signpost/http/HttpParameters.java
public void putMap(Map<String, List<String>> m) {
        for (String key : m.keySet()) {
            SortedSet<String> vals = get(key);
            if (vals == null) {
                vals = new TreeSet<String>();
                put(key, vals);
            }
            vals.addAll(m.get(key));
        }
    }
public void putMap(Map<String, List<String>> m) {
        for (String key : m.keySet()) {
            SortedSet<String> vals = get(key);
            if (vals == null) {
                vals = new TreeSet<String>();
                put(key, vals);
            }
            vals.addAll(m.get(key));
        }
    }
Convenience method to merge a Map<String, List<String>>.

@param m
the map