nctuation">(</span><span class="parameters "><span class="parameter ">observer<span class="token operator">: </span><a href="../-device-change-observer/index.html">DeviceChangeObserver</a></span></span><span class="token punctuation">)</span></div><div class="brief "><p class="paragraph">Adds an observer to receive callbacks about device changes.</p></div></div></div>
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