exist. This function
 will not perform a network request. Unless the <a href="../../com/parse/ParseFile.html" title="class in com.parse"><code>ParseFile</code></a> has been downloaded
 (e.g. by calling <a href="../../com/parse/ParseFile.html#getData()"><code>ParseFile.getData()</code></a>), <a href="../../com/parse/ParseFile.html#isDataAvailable()"><code>ParseFile.isDataAvailable()</code></a> will return
 false.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - The key to acce