feat(android): build only the requested abis in the bundled app build.gradle

`-PabiFilters=<abi>[,<abi>]` now narrows the native build down to those abis
instead of being ignored, and an apk debug build splits so each abi gets its own
package. `-PsplitEnabled` forces the split on for any build type; `-PonlyX86`
keeps its old meaning and disables splitting.

The property is what the CLI passes for the devices a run is about to deploy to,
so this needs #6130 to be fully functional - on its own it only makes the
property meaningful for anyone passing it through `--gradleArgs`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: farfromrefug

vendor/gradle-app/app/build.gradle

@@ -18,6 +18,8 @@
 *            -PandroidXMaterial=[androidx_material_version]
 *            -PappPath=[app_path]
 *            -PappResourcesPath=[app_resources_path]
+*            -PabiFilters=[abi][,abi...]  //build only these abis
+*            -PsplitEnabled  //one apk per abi
 */
 
 import groovy.io.FileType
@@ -50,6 +52,23 @@ if (onlyX86) {
     outLogger.withStyle(Style.Info).println "OnlyX86 build triggered."
 }
 
+def DEFAULT_ABIS = ["x86", "x86_64", "armeabi-v7a", "arm64-v8a"]
+// -PabiFilters=<abi>[,<abi>] narrows the build down to those abis. The CLI passes the abis of the
+// devices it is about to deploy to, unless --no-filter-devices-arch was given.
+def requestedAbis = project.hasProperty("abiFilters")
+        ? project.findProperty("abiFilters").split(",").collect { it.trim() as String }.findAll { it }
+        : null
+// splitting gives one apk per abi, so every device can be handed the one it needs. Only apk debug
+// builds split: a release artifact, like an app bundle, is meant to be shipped as a whole.
+def isDebugApkBuild = gradle.startParameter.taskNames.any { taskName ->
+    def name = taskName.toLowerCase()
+    name.startsWith("assemble") && name.endsWith("debug")
+}
+def splitEnabled = !onlyX86 && (project.hasProperty("splitEnabled") || (requestedAbis && isDebugApkBuild))
+if (requestedAbis) {
+    outLogger.withStyle(Style.Info).println "Building abis: ${requestedAbis.join(", ")}${splitEnabled ? " (one apk each)" : ""}"
+}
+
 //common
 def BUILD_TOOLS_PATH = "$rootDir/build-tools"
 def PASSED_TYPINGS_PATH = System.getenv("TNS_TYPESCRIPT_DECLARATIONS_PATH")
@@ -205,12 +224,25 @@ android {
         ndk {
             if (onlyX86) {
                 abiFilters 'x86'
+            } else if (splitEnabled) {
+                // the splits block below decides which abi ends up in which apk
+            } else if (requestedAbis) {
+                abiFilters.addAll(requestedAbis)
             } else {
-                abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
+                abiFilters.addAll(DEFAULT_ABIS)
             }
         }
     }
 
+    splits {
+        abi {
+            enable splitEnabled
+            reset()
+            include(*(requestedAbis ?: DEFAULT_ABIS))
+            universalApk false
+        }
+    }
+
     if (project.hasProperty("ndkVersion")) {
         ndkVersion project.ndkVersion
     }