Check if sdcard is present

How  to check if media is mounted:

boolean mExternalStorageAvailable = false;

boolean mExternalStorageWriteable = false;

String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state)) {

                       // We can read and write the media

                       mExternalStorageAvailable = mExternalStorageWriteable = true;

                       Log.d("readnwrite", "readandwrite");

                   }

else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {

                       // We can only read the media

                       mExternalStorageAvailable = true;

                       mExternalStorageWriteable = false;

                       Log.d("readonly", "readonly");

                   }

 else {

                       // Something else is wrong. It may be one of many other states, but all we need   to know is we can neither read nor write

                              Log.d("notworking", "notworking");

                       mExternalStorageAvailable = mExternalStorageWriteable = false;

                   }