Here you can find the source of getFileSizes(File f)
public static long getFileSizes(File f) throws Exception
//package com.java2s; /*// ww w . j av 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; import java.io.FileInputStream; public class Main { public static 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(); } return s; } }