Java tutorial
//package com.java2s; import android.os.Environment; public class Main { public static boolean isExternalStorageMounted() { boolean canRead = Environment.getExternalStorageDirectory().canRead(); boolean onlyRead = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY); boolean unMounted = Environment.getExternalStorageState().equals(Environment.MEDIA_UNMOUNTED); return !(!canRead || onlyRead || unMounted); } }