title: Shared Preferences initial declaration
body: <p>I'm new to android. i wanted to initialize a shared preference.
  i just need an auto increment id. i search many shared preferences and i cant understand their explanation.</p>
  
  <p>i just wanted a simple initialization of a number.</p>
  
  <p>for example, </p>
  
  <pre><code>key = RemID and initial value of that key is 0.
  </code></pre>
  
  <p>i want to initialize that at the first time only, not at every launch of my app</p>
  
  <p>and i will be using that value and increment and store it back.</p>
  
  <p>please share some thoughts. </p>