FileUtils.java

package com.hupu.games.util;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.io.FileInputStream;

import android.util.Log;

public class FileUtils {
	public long getFileSizes(File f) throws Exception {// 取得文件大小
		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;
	}

	public void deleteFolderFile(String filePath, boolean deleteThisPath)
			throws IOException {
		File file = new File(filePath);

		if (file.isDirectory()) {// 处理目录
			File files[] = file.listFiles();
			for (int i = 0; i < files.length; i++) {
				deleteFolderFile(files[i].getAbsolutePath(), true);
			}
		}
		if (deleteThisPath) {
			if (!file.isDirectory()) {// 如果是文件，删除
				file.delete();
			} else {// 目录
				if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除
					file.delete();
				}
			}
		}
	}

	// 递归
	public long getFileSize(final File f) throws Exception// 取得文件夹大小
	{
		long size = 0;
		// TODO Auto-generated method stub
		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;
	}

	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;
	}

	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;

	}


}