diff --git a/java/sdk_library.go b/java/sdk_library.go
index 301ec61..13a9275 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -18,8 +18,11 @@
 	"android/soong/android"
 	"android/soong/genrule"
 	"fmt"
+	"io"
 	"path"
+	"sort"
 	"strings"
+	"sync"
 
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
@@ -43,6 +46,10 @@
 	systemApiStubsTag = dependencyTag{name: "system"}
 )
 
+var (
+	javaSdkLibrariesLock sync.Mutex
+)
+
 // java_sdk_library is to make a Java library that implements optional platform APIs to apps.
 // It is actually a wrapper of several modules: 1) stubs library that clients are linked against
 // to, 2) droiddoc module that internally generates API stubs source files, 3) the real runtime
@@ -62,6 +69,12 @@
 	android.PreArchMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.TopDown("java_sdk_library", sdkLibraryMutator).Parallel()
 	})
+
+	android.RegisterMakeVarsProvider(pctx, func(ctx android.MakeVarsContext) {
+		javaSdkLibraries := javaSdkLibraries(ctx.Config())
+		sort.Strings(*javaSdkLibraries)
+		ctx.Strict("JAVA_SDK_LIBRARIES", strings.Join(*javaSdkLibraries, " "))
+	})
 }
 
 type sdkLibraryProperties struct {
@@ -120,6 +133,20 @@
 	})
 }
 
+func (module *sdkLibrary) AndroidMk() android.AndroidMkData {
+	// Create a phony module that installs the impl library, for the case when this lib is
+	// in PRODUCT_PACKAGES.
+	return android.AndroidMkData{
+		Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
+			fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)")
+			fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
+			fmt.Fprintln(w, "LOCAL_MODULE :=", name)
+			fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES := "+module.implName())
+			fmt.Fprintln(w, "include $(BUILD_PHONY_PACKAGE)")
+		},
+	}
+}
+
 // Module name of the stubs library
 func (module *sdkLibrary) stubsName(forSystemApi bool) string {
 	stubsName := module.BaseModuleName() + sdkStubsLibrarySuffix
@@ -210,6 +237,9 @@
 			Unbundled_build struct {
 				Enabled *bool
 			}
+			Pdk struct {
+				Enabled *bool
+			}
 		}
 	}{}
 
@@ -219,6 +249,7 @@
 	props.Sdk_version = proptools.StringPtr(module.sdkVersion(forSystemApi))
 	// Unbundled apps will use the prebult one from /prebuilts/sdk
 	props.Product_variables.Unbundled_build.Enabled = proptools.BoolPtr(false)
+	props.Product_variables.Pdk.Enabled = proptools.BoolPtr(false)
 
 	if module.SocSpecific() {
 		props.Soc_specific = proptools.BoolPtr(true)
@@ -281,17 +312,25 @@
 	props.Api_filename = proptools.StringPtr(currentApiFileName)
 	props.Removed_api_filename = proptools.StringPtr(removedApiFileName)
 
-	// Includes the main framework source to ensure that doclava has access to the
-	// visibility information for the base classes of the mock classes. Without it
-	// otherwise hidden methods could be visible.
-	// TODO: remove the need for this
+	// Include the part of the framework source. This is required for the case when
+	// API class is extending from the framework class. In that case, doclava needs
+	// to know whether the base class is hidden or not. Since that information is
+	// encoded as @hide string in the comment, we need source files for the classes,
+	// not the compiled ones. Also there are rare cases where part of SDK library is
+	// implemented in the framework (e.g. org.apache.http.legacy). In that case,
+	// we need framework source to make API stubs, though the sources are not
+	// required to build the runtime library.
 	props.Srcs_lib = proptools.StringPtr("framework")
 	props.Srcs_lib_whitelist_dirs = []string{"core/java"}
-	props.Srcs_lib_whitelist_pkgs = []string{"android"}
-	// These libs are required by doclava to parse the sources from framework.
+	props.Srcs_lib_whitelist_pkgs = module.properties.Api_packages
+	// Add android.annotation package to give access to the framework-defined
+	// annotations such as SystemApi, NonNull, etc.
+	props.Srcs_lib_whitelist_pkgs = append(props.Srcs_lib_whitelist_pkgs, "android.annotation")
+	// These libs are required by doclava to parse the framework sources add via
+	// Src_lib and Src_lib_whitelist_* properties just above.
 	// If we don't add them to the classpath, errors messages are generated by doclava,
 	// though they don't break the build.
-	props.Libs = append(props.Libs, "conscrypt", "bouncycastle", "okhttp")
+	props.Libs = append(props.Libs, "conscrypt", "bouncycastle", "okhttp", "framework")
 
 	mctx.CreateModule(android.ModuleFactoryAdaptor(DroiddocFactory), &props)
 }
@@ -397,6 +436,12 @@
 	}
 }
 
+func javaSdkLibraries(config android.Config) *[]string {
+	return config.Once("javaSdkLibraries", func() interface{} {
+		return &[]string{}
+	}).(*[]string)
+}
+
 // For a java_sdk_library module, create internal modules for stubs, docs,
 // runtime libs and xml file. If requested, the stubs and docs are created twice
 // once for public API level and once for system API level
@@ -413,6 +458,12 @@
 		// for runtime
 		module.createXmlFile(mctx)
 		module.createImplLibrary(mctx)
+
+		// record java_sdk_library modules so that they are exported to make
+		javaSdkLibraries := javaSdkLibraries(mctx.Config())
+		javaSdkLibrariesLock.Lock()
+		defer javaSdkLibrariesLock.Unlock()
+		*javaSdkLibraries = append(*javaSdkLibraries, module.BaseModuleName())
 	}
 }