Here you can find the source of getUsableSpace(File path)
public static long getUsableSpace(File path)
//package com.java2s; /*/*from w w w . jav a 2s . c om*/ * 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 android.os.StatFs; public class Main { public static long getUsableSpace(File path) { final StatFs stats = new StatFs(path.getPath()); return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks(); } }