Android获取文件夹及文件大小整合成的帮助类

开发中刚用到要判断文件夹大小，觉得还是必要做记录的，所以贴出来分享下。

代码片段，双击复制
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80	`package` `com.demo.file;` `import` `java.io.File;` `import` `java.text.DecimalFormat;` `import` `java.io.FileInputStream;` `public` `class` `GetFileSizeUtil {` `private` `static` `GetFileSizeUtil instance;` `public` `GetFileSizeUtil() {` `}` `public` `static` `GetFileSizeUtil getInstance() {` `if` `(instance ==` `null) {` `instance =` `new` `GetFileSizeUtil();` `}` `return` `instance;` `}` `/* 获取文件大小 /` `public` `long` `getFileSizes(File f)` `throws` `Exception {` `long` `s =` `0;` `if` `(f.exists()) {` `FileInputStream fis =` `null;` `fis =` `new` `FileInputStream(f);` `s = fis.available();` `}` `else` `{` `f.createNewFile();` `System.out.println("文件不存在");` `}` `return` `s;` `}` `/ 获取文件夹大小 /` `public` `long` `getFileSize(File f)` `throws` `Exception {` `long` `size =` `0;` `File flist[] = f.listFiles();` `for` `(int` `i =` `0; i < flist.length; i++) {` `if` `(flist<i>.isDirectory()) {` `size = size + getFileSize(flist<i>);` `}` `else` `{` `size = size + flist<i>.length();` `}` `}` `return` `size;` `}` `/ 转换文件大小单位(b/kb/mb/gb) /` `public` `String FormetFileSize(long` `fileS) {// 转换文件大小` `DecimalFormat df =` `new` `DecimalFormat("#.00");` `String fileSizeString =` `"";` `if` `(fileS <` `1024) {` `fileSizeString = df.format((double) fileS) +` `"B";` `}` `else` `if` `(fileS <` `1048576) {` `fileSizeString = df.format((double) fileS /` `1024) +` `"K";` `}` `else` `if` `(fileS <` `1073741824) {` `fileSizeString = df.format((double) fileS /` `1048576) +` `"M";` `}` `else` `{` `fileSizeString = df.format((double) fileS /` `1073741824) +` `"G";` `}` `return` `fileSizeString;` `}` `/ 获取文件个数 */` `public` `long` `getlist(File f) {// 递归求取目录文件个数` `long` `size =` `0;` `File flist[] = f.listFiles();` `size = flist.length;` `for` `(int` `i =` `0; i < flist.length; i++) {` `if` `(flist<i>.isDirectory()) {` `size = size + getlist(flist<i>);` `size--;` `}` `}` `return` `size;` `}` `}`

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