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The IMA SDK must be able to tell when ads are visible to users so that it can send the correct signals back to the ad server. IMA uses Active View reporting to measure the viewability of ads. This guide explains how Active View reporting works with IMA, as well as how to verify that the SDK is able to correctly capture viewability signals.
How Active View reporting works with the IMA SDK
The publisher designates a container element when creating the AdDisplayContainer.
As long as the AdDisplayContainer is viewable and unobstructed when the AdsRequest is made, Active View receives measurements on that container.
Verifying that the SDK can measure ad viewability
To check whether that the SDK is able to capture viewability signals, look for network requests sent to https://pagead2.googlesyndication.com/pcs/activeview and check for the mtos parameter. For more information, see Monitor Active View measurement.
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