Java tutorial
//package com.java2s; /* * Copyright (C) 2016 Peng fei Pan <sky@xiaopan.me> * * 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 android.os.Build; import android.os.StatFs; import java.io.File; public class Main { @SuppressWarnings("WeakerAccess") public static long getAvailableBytes(File dir) { if (!dir.exists() && !dir.mkdirs()) { return 0; } StatFs dirStatFs = new StatFs(dir.getPath()); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) { return dirStatFs.getAvailableBytes(); } else { //noinspection deprecation return (long) dirStatFs.getAvailableBlocks() * dirStatFs.getBlockSize(); } } }