Save android value and retrieve it again
<p>I have the following void</p>

<pre><code>protected void onPaymentSuccess(PaymentResponse response) {
  // Stuff...
}
</code></pre>

<p>I want to save a string within a void for example</p>

<pre><code>String key = "JHIJHFEIRUFHEURFGEU5";
</code></pre>

<p>And i want to be able to retrieve it again (this string to be saved to phone) after phone restart, closing application.</p>
