## Improved Fast Deployment doesn't work with Application subclasses

_Submitted by Jonathan Pryor \[MSFT\] on 2017-04-11 20:28 UTC_

Setting the \`$(AndroidFastDeploymentType)\` MSBuild property to \`Assemblies:Dexes\` enables enhanced fast deployment, which reduces the circumstances in which a .apk needs to be rebuilt:

<https://developer.xamarin.com/releases/android/xamarin.android_7/xamarin.android_7.2/#Fast_Deployment>

If the project contains an \`Android.App.Application\` subclass, the application will fail to start.

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_Reference: <https://bugzilla.xamarin.com/show_bug.cgi?id=55050>_