排序实例

1.按字母排序

List<ResolveInfo> activities=pm.queryIntentActivities(startupIntent,0);

Collections.sort(activities, new Comparator<ResolveInfo>() {    @Override    public int compare(ResolveInfo a, ResolveInfo b) {        PackageManager pm=getActivity().getPackageManager();        return String.CASE_INSENSITIVE_ORDER.compare(a.loadLabel(pm).toString(),b.loadLabel(pm).toString());    }});