title: How to get total RAM size of a device?
body: <p>I want to get full RAM size of a device. <code>memoryInfo.getTotalPss()</code> returns 0. There is not function for get total RAM size in <a href="http://developer.android.com/reference/android/app/ActivityManager.MemoryInfo.html"><code>ActivityManager.MemoryInfo</code></a>.</p>
  
  <p>How to do this?</p>