【Android笔记】

2015-06-02 23:18 University of New South Wales_2017

关注

【Android笔记】

1、获取文件夹大小：
1 /**
2 * 获取文件夹大小
3 * @param file File实例
4 * @return long
5 */
6 public static long getFolderSize(java.io.File file){
7
8 long size = 0;
9 try {
10 java.io.File[] fileList = file.listFiles();
11 for (int i = 0; i < fileList.length; i++)
12 {
13 if (fileList[i].isDirectory())
14 {
15 size = size + getFolderSize(fileList[i]);
16
17 }else{
18 size = size + fileList[i].length();
19
20 }
21 }
22 } catch (Exception e) {
23 // TODO Auto-generated catch block
24 e.printStackTrace();
25 }
26 //return size/1048576;
27 return size;
28 }
2、删除文件夹下所有文件：
1 /**
2 * 删除指定目录下文件及目录
3 * @param deleteThisPath
4 * @param filepath
5 * @return
6 */
7 public void deleteFolderFile(String filePath, boolean deleteThisPath) {
8 if (!TextUtils.isEmpty(filePath)) {
9 try {
10 File file = new File(filePath);
11 if (file.isDirectory()) {// 处理目录
12 File files[] = file.listFiles();
13 for (int i = 0; i < files.length; i++) {
14 deleteFolderFile(files[i].getAbsolutePath(), true);
15 }
16 }
17 if (deleteThisPath) {
18 if (!file.isDirectory()) {// 如果是文件，删除
19 file.delete();
20 } else {// 目录
21 if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除
22 file.delete();
23 }
24 }
25 }
26 } catch (Exception e) {
27 // TODO Auto-generated catch block
28 e.printStackTrace();
29 }
30 }

31 }

3、格式化文件夹大小单位：
1 /**
2 * 格式化单位
3 * @param size
4 * @return
5 */
6 public static String getFormatSize(double size) {
7 double kiloByte = size/1024;
8 if(kiloByte < 1) {
9 return size + "B";
10 }
11
12 double megaByte = kiloByte/1024;
13 if(megaByte < 1) {
14 BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
15 return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
16 }
17
18 double gigaByte = megaByte/1024;
19 if(gigaByte < 1) {
20 BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
21 return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
22 }
23
24 double teraBytes = gigaByte/1024;
25 if(teraBytes < 1) {
26 BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
27 return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
28 }
29 BigDecimal result4 = new BigDecimal(teraBytes);
30 return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
31 }

全站热榜