title: No way to access Context.USAGE_STATS_SERVICE
body: <p>I'm trying to access the <code>Usage_Stats_Service</code> in lollipop through this :</p>
  
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>final UsageStatsManager usageStatsManager=(UsageStatsManager)this.getSystemService(Context.USAGE_STATS_SERVICE);</code></pre>
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  <p>I can go to the <code>Context</code> class and see how this constant exist but Android Studio keeps saying that it is not a valid constant.</p>
  
  <p>I have tried to use the literal string too but it seems <code>getSystemService</code> has a constraint to only accept <code>@ServiceName</code> constants.</p>
  
  <p>I have spent almost 2 hours into this without finding out what is hapenning. Any help is welcomed. </p>