Set targetSdkVersion to 10000 iff a module is targeting an unreleased
sdk

Previously in aosp/1907152, targetSdkVersion for all modules would be
10000 in release builds. This would cause sdk compatibility errors like
b/209301265#3 for modules that were targeting a released SDK

This CL adds an additional check to set targetSdkVersion to 10000 only
if a module's apilevel is in preview (i.e. unreleased SDK)

Bug: 209301265

Test: Built various apk combinations locally, and used aapt2 to check
targetSdkVersion
Test: TARGET_BUILD_APPS=xyz m CaptivePortalLoginTests #
targetSdkVersion: 30
Test: m CaptivePortalLoginTests #targetSdkVersion: 30
Test: (internal) TARGET_BUILD_APPS=xyz m MediaProviderGoogle #
targetSdkVersion: 10000
Test: (internal) m MediaProviderGoogle #targetSdkVersion: Tiramisu

Change-Id: Id2901f23d4e1b436f8906940e47edd606a93657d
diff --git a/java/android_manifest.go b/java/android_manifest.go
index 38065f1..f29d8ad 100644
--- a/java/android_manifest.go
+++ b/java/android_manifest.go
@@ -16,6 +16,7 @@
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -42,6 +43,21 @@
 	},
 	"args", "libs")
 
+// targetSdkVersion for manifest_fixer
+// When TARGET_BUILD_APPS is not empty, this method returns 10000 for modules targeting an unreleased SDK
+// This enables release builds (that run with TARGET_BUILD_APPS=[val...]) to target APIs that have not yet been finalized as part of an SDK
+func targetSdkVersionForManifestFixer(ctx android.ModuleContext, sdkContext android.SdkContext) string {
+	targetSdkVersionSpec := sdkContext.TargetSdkVersion(ctx)
+	if ctx.Config().UnbundledBuildApps() && targetSdkVersionSpec.ApiLevel.IsPreview() {
+		return strconv.Itoa(android.FutureApiLevel.FinalOrFutureInt())
+	}
+	targetSdkVersion, err := targetSdkVersionSpec.EffectiveVersionString(ctx)
+	if err != nil {
+		ctx.ModuleErrorf("invalid targetSdkVersion: %s", err)
+	}
+	return targetSdkVersion
+}
+
 // Uses manifest_fixer.py to inject minSdkVersion, etc. into an AndroidManifest.xml
 func manifestFixer(ctx android.ModuleContext, manifest android.Path, sdkContext android.SdkContext,
 	classLoaderContexts dexpreopt.ClassLoaderContextMap, isLibrary, useEmbeddedNativeLibs, usesNonSdkApis,
@@ -89,10 +105,8 @@
 		args = append(args, "--logging-parent", loggingParent)
 	}
 	var deps android.Paths
-	targetSdkVersion, err := sdkContext.TargetSdkVersion(ctx).EffectiveVersionString(ctx)
-	if err != nil {
-		ctx.ModuleErrorf("invalid targetSdkVersion: %s", err)
-	}
+	targetSdkVersion := targetSdkVersionForManifestFixer(ctx, sdkContext)
+
 	if UseApiFingerprint(ctx) && ctx.ModuleName() != "framework-res" {
 		targetSdkVersion = ctx.Config().PlatformSdkCodename() + fmt.Sprintf(".$$(cat %s)", ApiFingerprintPath(ctx).String())
 		deps = append(deps, ApiFingerprintPath(ctx))