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<pre>public interface <span class="typeNameLabel">Key</span></pre>
<div class="block">An interface that uniquely identifies some put of data. Implementations must implement <a href="http://d.android.com/reference/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang"><code>Object.equals(Object)</code></a> and <a href="http://d.android.com/reference/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang"><code>Objec