title: Boolean Shared Preference
body: <p>My app is working. and now my problem is that how can I transfer it on a <strong>sharedpreference</strong>? I have a <code>achievement class</code>. the first achievement is "Play 1st Game" so what I do is. I set a boolean whenever the player clicks on the <code>play button</code> then I called it on my Achievement Class, if its true then I make my imageview.setvisibility(View.VISIBLE). how can I use sharedpreference on this? Im confused. and please apologized</p>