Java tutorial
//package com.java2s; import android.os.Environment; import android.os.StatFs; public class Main { public static long getExternalStorageSpace() { long space = 0; try { StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath()); space = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize(); } catch (Exception e) { e.printStackTrace(); } return space; } }