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<pre>public class <span class="typeNameLabel">RequestTracker</span>
extends <a href="http://d.android.com/reference/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">A class for tracking, canceling, and restarting in progress, completed, and failed requests.

 <p>This class is not thread safe and must be accessed on the main thread.</div>
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