Java tutorial
//package com.java2s; //License from project: Apache License import java.io.File; import android.os.Environment; import android.os.StatFs; public class Main { public static final StatFs mStatFs = new StatFs(Environment.getDataDirectory().getPath()); public static long getAvailableExternalMemorySize() { if (externalMemoryAvailable()) { File path = Environment.getExternalStorageDirectory(); mStatFs.restat(path.getPath()); long blockSize = mStatFs.getBlockSize(); long availableBlocks = mStatFs.getAvailableBlocks(); return availableBlocks * blockSize; } else { return -1; } } public static boolean externalMemoryAvailable() { return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED); } }