diff --git a/java/config/config.go b/java/config/config.go
index 92cfb84..5c838a5 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -154,4 +154,7 @@
 	pctx.SourcePathsVariable("ManifestMergerClasspath", ":", ManifestMergerClasspath...)
 
 	pctx.HostBinToolVariable("ZipAlign", "zipalign")
+
+	pctx.HostBinToolVariable("Class2Greylist", "class2greylist")
+	pctx.HostBinToolVariable("HiddenAPI", "hiddenapi")
 }
diff --git a/java/config/makevars.go b/java/config/makevars.go
index 01adaa7..156ee26 100644
--- a/java/config/makevars.go
+++ b/java/config/makevars.go
@@ -78,4 +78,7 @@
 	ctx.Strict("ANDROID_MANIFEST_MERGER_DEPS", "${ManifestMergerJars}")
 	ctx.Strict("ANDROID_MANIFEST_MERGER",
 		"${JavaCmd} -classpath ${ManifestMergerClasspath} com.android.manifmerger.Merger")
+
+	ctx.Strict("CLASS2GREYLIST", "${Class2Greylist}")
+	ctx.Strict("HIDDENAPI", "${HiddenAPI}")
 }
diff --git a/java/hiddenapi.go b/java/hiddenapi.go
new file mode 100644
index 0000000..7378b64
--- /dev/null
+++ b/java/hiddenapi.go
@@ -0,0 +1,150 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package java
+
+import (
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/google/blueprint"
+
+	"android/soong/android"
+)
+
+var hiddenAPIGenerateCSVRule = pctx.AndroidStaticRule("hiddenAPIGenerateCSV", blueprint.RuleParams{
+	Command:     "${config.Class2Greylist} --public-api-list ${publicAPIList} $in $outFlag $out",
+	CommandDeps: []string{"${config.Class2Greylist}"},
+}, "outFlag", "publicAPIList")
+
+func hiddenAPIGenerateCSV(ctx android.ModuleContext, classesJar android.Path) {
+	flagsCSV := android.PathForModuleOut(ctx, "hiddenapi", "flags.csv")
+	metadataCSV := android.PathForModuleOut(ctx, "hiddenapi", "metadata.csv")
+	publicList := &bootImagePath{ctx.Config().HiddenAPIPublicList()}
+
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        hiddenAPIGenerateCSVRule,
+		Description: "hiddenapi flags",
+		Input:       classesJar,
+		Output:      flagsCSV,
+		Implicit:    publicList,
+		Args: map[string]string{
+			"outFlag":       "--write-flags-csv",
+			"publicAPIList": publicList.String(),
+		},
+	})
+
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        hiddenAPIGenerateCSVRule,
+		Description: "hiddenapi metadata",
+		Input:       classesJar,
+		Output:      metadataCSV,
+		Implicit:    publicList,
+		Args: map[string]string{
+			"outFlag":       "--write-metadata-csv",
+			"publicAPIList": publicList.String(),
+		},
+	})
+
+	hiddenAPISaveCSVOutputs(ctx, flagsCSV, metadataCSV)
+}
+
+var hiddenAPIEncodeDexRule = pctx.AndroidStaticRule("hiddenAPIEncodeDex", blueprint.RuleParams{
+	Command: `rm -rf $tmpDir && mkdir -p $tmpDir && mkdir $tmpDir/dex-input && mkdir $tmpDir/dex-output && ` +
+		`unzip -o -q $in 'classes*.dex' -d $tmpDir/dex-input && ` +
+		`for INPUT_DEX in $$(find $tmpDir/dex-input -maxdepth 1 -name 'classes*.dex' | sort); do ` +
+		`  echo "--input-dex=$${INPUT_DEX}"; ` +
+		`  echo "--output-dex=$tmpDir/dex-output/$$(basename $${INPUT_DEX})"; ` +
+		`done | xargs ${config.HiddenAPI} encode --api-flags=$flags && ` +
+		`${config.SoongZipCmd} -o $tmpDir/dex.jar -C $tmpDir/dex-output -f "$tmpDir/dex-output/classes*.dex" && ` +
+		`${config.MergeZipsCmd} -D -zipToNotStrip $tmpDir/dex.jar -stripFile "classes*.dex" $out $tmpDir/dex.jar $in`,
+	CommandDeps: []string{
+		"${config.HiddenAPI}",
+		"${config.SoongZipCmd}",
+		"${config.MergeZipsCmd}",
+	},
+}, "flags", "tmpDir")
+
+func hiddenAPIEncodeDex(ctx android.ModuleContext, output android.WritablePath, dexInput android.WritablePath) {
+	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
+		output = dexInput
+		return
+	}
+
+	flags := &bootImagePath{ctx.Config().HiddenAPIFlags()}
+
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        hiddenAPIEncodeDexRule,
+		Description: "hiddenapi encode dex",
+		Input:       dexInput,
+		Output:      output,
+		Implicit:    flags,
+		Args: map[string]string{
+			"flags":  flags.String(),
+			"tmpDir": android.PathForModuleOut(ctx, "hiddenapi", "dex").String(),
+		},
+	})
+
+	hiddenAPISaveDexInputs(ctx, dexInput)
+}
+
+const hiddenAPIOutputsKey = "hiddenAPIOutputsKey"
+
+var hiddenAPIOutputsLock sync.Mutex
+
+func hiddenAPIGetOutputs(config android.Config) (*android.Paths, *android.Paths, *android.Paths) {
+	type threePathsPtrs [3]*android.Paths
+	s := config.Once(hiddenAPIOutputsKey, func() interface{} {
+		return threePathsPtrs{new(android.Paths), new(android.Paths), new(android.Paths)}
+	}).(threePathsPtrs)
+	return s[0], s[1], s[2]
+}
+
+func hiddenAPISaveCSVOutputs(ctx android.ModuleContext, flagsCSV, metadataCSV android.Path) {
+	flagsCSVList, metadataCSVList, _ := hiddenAPIGetOutputs(ctx.Config())
+
+	hiddenAPIOutputsLock.Lock()
+	defer hiddenAPIOutputsLock.Unlock()
+
+	*flagsCSVList = append(*flagsCSVList, flagsCSV)
+	*metadataCSVList = append(*metadataCSVList, metadataCSV)
+}
+
+func hiddenAPISaveDexInputs(ctx android.ModuleContext, dexInput android.Path) {
+	_, _, dexInputList := hiddenAPIGetOutputs(ctx.Config())
+
+	hiddenAPIOutputsLock.Lock()
+	defer hiddenAPIOutputsLock.Unlock()
+
+	*dexInputList = append(*dexInputList, dexInput)
+}
+
+func init() {
+	android.RegisterMakeVarsProvider(pctx, hiddenAPIMakeVars)
+}
+
+func hiddenAPIMakeVars(ctx android.MakeVarsContext) {
+	flagsCSVList, metadataCSVList, dexInputList := hiddenAPIGetOutputs(ctx.Config())
+
+	export := func(name string, paths *android.Paths) {
+		s := paths.Strings()
+		sort.Strings(s)
+		ctx.Strict(name, strings.Join(s, " "))
+	}
+
+	export("SOONG_HIDDENAPI_FLAGS", flagsCSVList)
+	export("SOONG_HIDDENAPI_GREYLIST_METADATA", metadataCSVList)
+	export("SOONG_HIDDENAPI_DEX_INPUTS", dexInputList)
+}
diff --git a/java/java.go b/java/java.go
index 2ac5a5b..49095ca 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1172,12 +1172,25 @@
 	j.implementationAndResourcesJar = implementationAndResourcesJar
 
 	if ctx.Device() && (Bool(j.properties.Installable) || Bool(j.deviceProperties.Compile_dex)) {
+		// Dex compilation
 		var dexOutputFile android.ModuleOutPath
 		dexOutputFile = j.compileDex(ctx, flags, outputFile, jarName)
 		if ctx.Failed() {
 			return
 		}
 
+		// Hidden API CSV generation and dex encoding
+		isBootJar := inList(ctx.ModuleName(), ctx.Config().BootJars())
+		if isBootJar || inList(ctx.ModuleName(), ctx.Config().HiddenAPIExtraAppUsageJars()) {
+			// Derive the greylist from classes jar.
+			hiddenAPIGenerateCSV(ctx, j.implementationJarFile)
+		}
+		if isBootJar {
+			hiddenAPIJar := android.PathForModuleOut(ctx, "hiddenapi", jarName)
+			hiddenAPIEncodeDex(ctx, hiddenAPIJar, dexOutputFile)
+			dexOutputFile = hiddenAPIJar
+		}
+
 		// merge dex jar with resources if necessary
 		if j.resourceJar != nil {
 			jars := android.Paths{dexOutputFile, j.resourceJar}
@@ -1189,6 +1202,7 @@
 
 		j.dexJarFile = dexOutputFile
 
+		// Dexpreopting
 		j.dexpreopter.isInstallable = Bool(j.properties.Installable)
 		j.dexpreopter.uncompressedDex = j.deviceProperties.UncompressDex
 		dexOutputFile = j.dexpreopt(ctx, dexOutputFile)