Java tutorial
//package com.java2s; import android.os.Environment; import android.os.StatFs; public class Main { public static String root = Environment.getExternalStorageDirectory().getPath(); private static long getAvailableStorage() { StatFs statFs = new StatFs(root); long blockSize = statFs.getBlockSize(); long availableBlocks = statFs.getAvailableBlocks(); long availableSize = blockSize * availableBlocks; // Formatter.formatFileSize(context, availableSize); return availableSize; } }