android 透过文件路径，判断文件大小

android 通过文件路径，判断文件大小

1.用来判断文件大小的方法的类package com.email.filesize;import java.io.File;import java.io.FileInputStream;import java.text.DecimalFormat;public class GetFileSize {public GetFileSize() {}public long getFileSizes(File f) throws Exception {long s = 0;if (f.exists()) {FileInputStream fis = null;fis = new FileInputStream(f);s = fis.available();fis.close();} else {f.createNewFile();System.out.println("文件夹不存在");}return s;}/** * 递归 * */public long getFileSize(File f) {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 * */public String FormentFileSize(long fileS) {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;}///**// * 递归求取目录文件个数// * *///public long getlist(File f) {//long size = 0;//File flist[] = f.listFiles();//System.out.println("-------------" + flist.length);//size = flist.length;//for (int i = 0; i < flist.length; i++) {//if (flist[i].isDirectory()) {//size = size + getlist(flist[i]);//size--;//}//}//return size;//}}2.判断文件大小，在主函数中写的语句GetFileSize g = new GetFileSize();String path = File.separator + "mnt" + File.separator + "sdcard" + File.separator + "1.txt";File ff = new File(path);try {       l = g.getFileSizes(ff);    } catch (Exception e) {      e.printStackTrace();    } System.out.println(path + "文件的大小为：" + g.FormentFileSize(l));