title: Android: How to make a Spinner invisible and then visible again?
body: <p>I have the following <code>Spinner</code>:</p>
  
  <pre><code>Spinner spinner = (Spinner)findViewById(R.id.sp1);
  </code></pre>
  
  <p>and I initially make it invisible like this:</p>
  
  <pre><code>spinner.setVisibility(TRIM_MEMORY_BACKGROUND);
  </code></pre>
  
  <p>This does make the <code>Spinner</code> invisible but how to make it visible again?</p>
  
  <p>Thanks in advance.</p>