Here you can find the source of getFileSize(File f)
public static long getFileSize(File f) throws Exception
//package com.java2s; /*// w ww . j a v a2s .c o m * Copyright (C) 2013 WhiteCat ?? (www.thinkandroid.cn) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.File; public class Main { public static 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; } }