Java tutorial
//package com.java2s; import android.os.Environment; public class Main { public static boolean isSDCardWritable() { if (isSDCardExist()) { return !Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY); } return false; } public static boolean isSDCardExist() { return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } }