java 对读取的文件进行排序
参数里面的isAscend 用来决定是升序排列 还是降序排列：
/*** * 按最后修改时间排序 * @param list * @param isAscend */public static void sortListByTime(List<FileInfo> list , boolean isAscend) {// 对ListView中数据list排序ComparatorByTime comparator = new ComparatorByTime(isAscend);if (!list.isEmpty()) {Log.e("sortListByTime()", "");synchronized (list) {Collections.sort(list, comparator);}}}/** * 按文件大小排序 * @param list */public static void sortListBySize(List<FileInfo> list , boolean isAscend) {// 对ListView中数据list排序ComparatorBySize comparator = new ComparatorBySize(isAscend);if (!list.isEmpty()) {Log.e("sortListBySize()", "");synchronized (list) {Collections.sort(list, comparator);}}}/** * 按文件名称排序 * @param list */public static void sortListByName(List<FileInfo> list , boolean isAscend) {// 对ListView中数据list排序ComparatorByName comparator = new ComparatorByName(isAscend);if (!list.isEmpty()) {Log.e("sortListByName()", "");synchronized (list) {Collections.sort(list, comparator);}}}public class ComparatorByName implements Comparator<FileInfo>{boolean isAscend;public ComparatorByName(boolean isAscend){this.isAscend = isAscend;}public int compare(FileInfo f1, FileInfo f2) {if(isAscend == true){return Collator.getInstance(Locale.CHINESE).compare(f1.fileName, f2.fileName);} else {return Collator.getInstance(Locale.CHINESE).compare(f2.fileName, f1.fileName); }}}public class ComparatorBySize implements Comparator<FileInfo>{boolean isAscend;public ComparatorBySize(boolean isAscend){this.isAscend = isAscend;}public int compare(FileInfo f1, FileInfo f2) {long temp = new File(f2.filePath).length() - new File(f1.filePath).length();if(isAscend == false){if(temp > 0){return 1;}else if(temp == 0 ){return 0;}else{return -1;}}else{if(temp > 0){return -1;}else if(temp == 0 ){return 0;}else{return 1;}}}}public class ComparatorByTime implements Comparator<FileInfo>{boolean isAscend;public ComparatorByTime(boolean isAscend){this.isAscend = isAscend;}public int compare(FileInfo f1, FileInfo f2) {if(isAscend == false){return f2.lastModifiedTime.compareTo(f1.lastModifiedTime);} else {return f1.lastModifiedTime.compareTo(f2.lastModifiedTime);}}}