[JAVA] Android用到的一些文件操作

// 获得某个文件夹folderPath下面某种文件后缀fileType的所有文件名public static List<String> getFileNamesInFolder(String folderPath,String fileType) {File folder = new File(folderPath);File[] files = folder.listFiles();List<String> fileNames = new ArrayList<String>();for (int i = 0; i < files.length; ++i) {File file = files[i];if (file.isFile()) {String[] str = file.getPath().split("//.");if (str[str.length - 1].equals(fileType)) { // 分割完后查最后的分割单元fileNames.add(file.getName().split("//.")[0]);}}}return fileNames;}// 递归查询当前可以使用的默认文件名Test的numberpublic static int calFileNameIndex(List<String> nameList, int currentNum) {String str = "Test";for (int i = 0; i < nameList.size(); ++i) {if (nameList.get(i).toString().equals(str + currentNum)) {nameList.remove(i);currentNum = calFileNameIndex(nameList, ++currentNum);break;}}return currentNum;}