teojunjie

### Keybase proof

I hereby claim:

  * I am teojunjie on github.
  * I am teojunjie (https://keybase.io/teojunjie) on keybase.
  * I have a public key ASCAW5f2B9GaTx_WVXAwXRQ7DgmIEy5Eb5I3ngTD1owzkgo

To claim this, I am signing this object:

teojunjie

// Original written by tsuharesu
// Adapted to create a "drop it in and watch it work" approach by Nikhil Jha.
// Just add your package statement and drop it in the folder with all your other classes.

import android.content.Context;
import android.preference.PreferenceManager;
import android.util.Log;

import java.io.IOException;
import java.util.HashSet;