docs: cover AGP 9 gradle.properties and build.gradle version declarations - #605
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docs: cover AGP 9 gradle.properties and build.gradle version declarations#605andredestro wants to merge 1 commit into
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…ions The Android upgrade guide tells readers to run the AGP Upgrade Assistant but never says to clean up the compatibility flags it writes into gradle.properties, several of which break a Capacitor 9 build. Also document the explicit dependency version declarations in app/build.gradle: the implicit parent project property lookup they replace is deprecated in Gradle 9.6 and becomes an error in Gradle 10.
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andredestro
requested review from
ItsChaceD,
OS-pedrogustavobilro,
OS-ruimoreiramendes,
alexgerardojacinto,
jcesarmobile,
markemer and
theproducer
August 28, 2026 11:51
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Description
Two sections added to the Capacitor 9 app upgrade guide (
updating/9-0), both under Android:Clean up gradle.properties, placed right after "Upgrade Android Studio". That section tells readers to run
Tools -> AGP Upgrade Assistant, which is precisely what writes the AGP 8 compatibility flags intogradle.properties. The guide recommended the step without saying to clean up after it, and a couple of those flags break a Capacitor 9 build (android.builtInKotlin=falsedisables the Kotlin support AGP 9 bundles,android.sdk.defaultTargetSdkToCompileSdkIfUnset=falsestops AGP from inferringtargetSdkVersion).Declare dependency versions in your app's build.gradle, covering the six explicit
defdeclarations that replace the implicit parent project property lookup. That lookup is deprecated in Gradle 9.6 and becomes an error in Gradle 10. The block matches the one in the Capacitor 9 Android template.The topics the guide already covered (
jcenter(), the ProGuard file rename,targetSdkVersion, built-in Kotlin) are unchanged.Both changes are also handled automatically by
cap migratein ionic-team/capacitor#8584, so the manual steps here mirror what the CLI does.