diff --git a/java/aar.go b/java/aar.go
index ae064e5..1ba65dc 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -15,11 +15,12 @@
 package java
 
 import (
-	"android/soong/android"
 	"fmt"
 	"path/filepath"
 	"strings"
 
+	"android/soong/android"
+
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 )
diff --git a/java/androidmk.go b/java/androidmk.go
index 04bf15c..7c19180 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -695,3 +695,16 @@
 	}
 	entries.AddStrings("LOCAL_COMPATIBILITY_SUPPORT_FILES", testFiles...)
 }
+
+func (r *RuntimeResourceOverlay) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
+		Class:      "ETC",
+		OutputFile: android.OptionalPathForPath(r.outputFile),
+		Include:    "$(BUILD_SYSTEM)/soong_app_prebuilt.mk",
+		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
+			func(entries *android.AndroidMkEntries) {
+				entries.SetPath("LOCAL_MODULE_PATH", r.installDir.ToMakePath())
+			},
+		},
+	}}
+}
diff --git a/java/app.go b/java/app.go
index e9941f2..d253a12 100755
--- a/java/app.go
+++ b/java/app.go
@@ -47,6 +47,7 @@
 	ctx.RegisterModuleType("override_android_test", OverrideAndroidTestModuleFactory)
 	ctx.RegisterModuleType("android_app_import", AndroidAppImportFactory)
 	ctx.RegisterModuleType("android_test_import", AndroidTestImportFactory)
+	ctx.RegisterModuleType("runtime_resource_overlay", RuntimeResourceOverlayFactory)
 }
 
 // AndroidManifest.xml merging
@@ -1212,6 +1213,95 @@
 	return module
 }
 
+type RuntimeResourceOverlay struct {
+	android.ModuleBase
+	android.DefaultableModuleBase
+	aapt
+
+	properties RuntimeResourceOverlayProperties
+
+	outputFile android.Path
+	installDir android.InstallPath
+}
+
+type RuntimeResourceOverlayProperties struct {
+	// the name of a certificate in the default certificate directory or an android_app_certificate
+	// module name in the form ":module".
+	Certificate *string
+
+	// optional theme name. If specified, the overlay package will be applied
+	// only when the ro.boot.vendor.overlay.theme system property is set to the same value.
+	Theme *string
+
+	// if not blank, set to the version of the sdk to compile against.
+	// Defaults to compiling against the current platform.
+	Sdk_version *string
+
+	// if not blank, set the minimum version of the sdk that the compiled artifacts will run against.
+	// Defaults to sdk_version if not set.
+	Min_sdk_version *string
+}
+
+func (r *RuntimeResourceOverlay) DepsMutator(ctx android.BottomUpMutatorContext) {
+	sdkDep := decodeSdkDep(ctx, sdkContext(r))
+	if sdkDep.hasFrameworkLibs() {
+		r.aapt.deps(ctx, sdkDep)
+	}
+
+	cert := android.SrcIsModule(String(r.properties.Certificate))
+	if cert != "" {
+		ctx.AddDependency(ctx.Module(), certificateTag, cert)
+	}
+}
+
+func (r *RuntimeResourceOverlay) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	// Compile and link resources
+	r.aapt.hasNoCode = true
+	r.aapt.buildActions(ctx, r)
+
+	// Sign the built package
+	_, certificates := collectAppDeps(ctx, false)
+	certificates = processMainCert(r.ModuleBase, String(r.properties.Certificate), certificates, ctx)
+	signed := android.PathForModuleOut(ctx, "signed", r.Name()+".apk")
+	SignAppPackage(ctx, signed, r.aapt.exportPackage, certificates)
+
+	r.outputFile = signed
+	r.installDir = android.PathForModuleInstall(ctx, "overlay", String(r.properties.Theme))
+	ctx.InstallFile(r.installDir, r.outputFile.Base(), r.outputFile)
+}
+
+func (r *RuntimeResourceOverlay) sdkVersion() string {
+	return String(r.properties.Sdk_version)
+}
+
+func (r *RuntimeResourceOverlay) systemModules() string {
+	return ""
+}
+
+func (r *RuntimeResourceOverlay) minSdkVersion() string {
+	if r.properties.Min_sdk_version != nil {
+		return *r.properties.Min_sdk_version
+	}
+	return r.sdkVersion()
+}
+
+func (r *RuntimeResourceOverlay) targetSdkVersion() string {
+	return r.sdkVersion()
+}
+
+// runtime_resource_overlay generates a resource-only apk file that can overlay application and
+// system resources at run time.
+func RuntimeResourceOverlayFactory() android.Module {
+	module := &RuntimeResourceOverlay{}
+	module.AddProperties(
+		&module.properties,
+		&module.aaptProperties)
+
+	InitJavaModule(module, android.DeviceSupported)
+
+	return module
+}
+
 type UsesLibraryProperties struct {
 	// A list of shared library modules that will be listed in uses-library tags in the AndroidManifest.xml file.
 	Uses_libs []string
diff --git a/java/app_test.go b/java/app_test.go
index 6f89da4..ce5c893 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -2207,3 +2207,45 @@
 		}
 	}
 }
+
+func TestRuntimeResourceOverlay(t *testing.T) {
+	ctx, config := testJava(t, `
+		runtime_resource_overlay {
+			name: "foo",
+			certificate: "platform",
+			product_specific: true,
+		}
+
+		runtime_resource_overlay {
+			name: "foo_themed",
+			certificate: "platform",
+			product_specific: true,
+			theme: "faza",
+		}
+		`)
+
+	m := ctx.ModuleForTests("foo", "android_common")
+
+	// Check cert signing flag.
+	signedApk := m.Output("signed/foo.apk")
+	signingFlag := signedApk.Args["certificates"]
+	expected := "build/make/target/product/security/platform.x509.pem build/make/target/product/security/platform.pk8"
+	if expected != signingFlag {
+		t.Errorf("Incorrect signing flags, expected: %q, got: %q", expected, signingFlag)
+	}
+
+	// Check device location.
+	path := android.AndroidMkEntriesForTest(t, config, "", m.Module())[0].EntryMap["LOCAL_MODULE_PATH"]
+	expectedPath := []string{"/tmp/target/product/test_device/product/overlay"}
+	if !reflect.DeepEqual(path, expectedPath) {
+		t.Errorf("Unexpected LOCAL_MODULE_PATH value: %v, expected: %v", path, expectedPath)
+	}
+
+	// A themed module has a different device location
+	m = ctx.ModuleForTests("foo_themed", "android_common")
+	path = android.AndroidMkEntriesForTest(t, config, "", m.Module())[0].EntryMap["LOCAL_MODULE_PATH"]
+	expectedPath = []string{"/tmp/target/product/test_device/product/overlay/faza"}
+	if !reflect.DeepEqual(path, expectedPath) {
+		t.Errorf("Unexpected LOCAL_MODULE_PATH value: %v, expected: %v", path, expectedPath)
+	}
+}
diff --git a/java/sdk.go b/java/sdk.go
index 66eb284..2aa797a 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -15,14 +15,15 @@
 package java
 
 import (
-	"android/soong/android"
-	"android/soong/java/config"
 	"fmt"
 	"path/filepath"
 	"sort"
 	"strconv"
 	"strings"
 
+	"android/soong/android"
+	"android/soong/java/config"
+
 	"github.com/google/blueprint/pathtools"
 )