rst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/bumptech/glide/request/target/CustomViewTarget.html#onResourceLoading-android.graphics.drawable.Drawable-">onResourceLoading</a></span>(android.graphics.drawable.Drawable&nbsp;placeholder)</code>
<div class="block">An optional callback invoked when a resource load is started.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><c