diff --git a/java/androidmk.go b/java/androidmk.go
index 9d5885f..2c02e5f 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -507,14 +507,53 @@
 func (ddoc *Droiddoc) AndroidMkEntries() []android.AndroidMkEntries {
 	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
-		OutputFile: android.OptionalPathForPath(ddoc.Javadoc.docZip),
+		OutputFile: android.OptionalPathForPath(ddoc.stubsSrcJar),
 		Include:    "$(BUILD_SYSTEM)/soong_droiddoc_prebuilt.mk",
 		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
 			func(entries *android.AndroidMkEntries) {
-				if ddoc.Javadoc.docZip != nil {
+				if BoolDefault(ddoc.Javadoc.properties.Installable, true) && ddoc.Javadoc.docZip != nil {
 					entries.SetPath("LOCAL_DROIDDOC_DOC_ZIP", ddoc.Javadoc.docZip)
 				}
-				entries.SetBoolIfTrue("LOCAL_UNINSTALLABLE_MODULE", !BoolDefault(ddoc.Javadoc.properties.Installable, true))
+				if ddoc.Javadoc.stubsSrcJar != nil {
+					entries.SetPath("LOCAL_DROIDDOC_STUBS_SRCJAR", ddoc.Javadoc.stubsSrcJar)
+				}
+			},
+		},
+		ExtraFooters: []android.AndroidMkExtraFootersFunc{
+			func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
+				if ddoc.checkCurrentApiTimestamp != nil {
+					fmt.Fprintln(w, ".PHONY:", ddoc.Name()+"-check-current-api")
+					fmt.Fprintln(w, ddoc.Name()+"-check-current-api:",
+						ddoc.checkCurrentApiTimestamp.String())
+
+					fmt.Fprintln(w, ".PHONY: checkapi")
+					fmt.Fprintln(w, "checkapi:",
+						ddoc.checkCurrentApiTimestamp.String())
+
+					fmt.Fprintln(w, ".PHONY: droidcore")
+					fmt.Fprintln(w, "droidcore: checkapi")
+				}
+				if ddoc.updateCurrentApiTimestamp != nil {
+					fmt.Fprintln(w, ".PHONY:", ddoc.Name()+"-update-current-api")
+					fmt.Fprintln(w, ddoc.Name()+"-update-current-api:",
+						ddoc.updateCurrentApiTimestamp.String())
+
+					fmt.Fprintln(w, ".PHONY: update-api")
+					fmt.Fprintln(w, "update-api:",
+						ddoc.updateCurrentApiTimestamp.String())
+				}
+				if ddoc.checkLastReleasedApiTimestamp != nil {
+					fmt.Fprintln(w, ".PHONY:", ddoc.Name()+"-check-last-released-api")
+					fmt.Fprintln(w, ddoc.Name()+"-check-last-released-api:",
+						ddoc.checkLastReleasedApiTimestamp.String())
+
+					fmt.Fprintln(w, ".PHONY: checkapi")
+					fmt.Fprintln(w, "checkapi:",
+						ddoc.checkLastReleasedApiTimestamp.String())
+
+					fmt.Fprintln(w, ".PHONY: droidcore")
+					fmt.Fprintln(w, "droidcore: checkapi")
+				}
 			},
 		},
 	}}
diff --git a/java/droiddoc.go b/java/droiddoc.go
index 5ccc306..4c5f66c 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -70,6 +70,10 @@
 	// or .aidl files.
 	Srcs []string `android:"path,arch_variant"`
 
+	// list of directories rooted at the Android.bp file that will
+	// be added to the search paths for finding source files when passing package names.
+	Local_sourcepaths []string
+
 	// list of source files that should not be used to build the Java module.
 	// This is most useful in the arch/multilib variants to remove non-common files
 	// filegroup or genrule can be included within this property.
@@ -171,6 +175,10 @@
 	// resources output directory under out/soong/.intermediates.
 	Resourcesoutdir *string
 
+	// if set to true, collect the values used by the Dev tools and
+	// write them in files packaged with the SDK. Defaults to false.
+	Write_sdk_values *bool
+
 	// index.html under current module will be copied to docs out dir, if not null.
 	Static_doc_index_redirect *string `android:"path"`
 
@@ -187,6 +195,22 @@
 	// the generated removed API filename by Doclava.
 	Removed_api_filename *string
 
+	// the generated removed Dex API filename by Doclava.
+	Removed_dex_api_filename *string
+
+	// if set to false, don't allow droiddoc to generate stubs source files. Defaults to false.
+	Create_stubs *bool
+
+	Check_api struct {
+		Last_released ApiToCheck
+
+		Current ApiToCheck
+
+		// do not perform API check against Last_released, in the case that both two specified API
+		// files by Last_released are modules which don't exist.
+		Ignore_missing_latest_api *bool `blueprint:"mutated"`
+	}
+
 	// if set to true, generate docs through Dokka instead of Doclava.
 	Dokka_enabled *bool
 
@@ -615,9 +639,10 @@
 	j.srcFiles = srcFiles.FilterOutByExt(".srcjar")
 	j.srcFiles = append(j.srcFiles, deps.srcs...)
 
-	if len(j.srcFiles) > 0 {
-		j.sourcepaths = android.PathsForModuleSrc(ctx, []string{"."})
+	if j.properties.Local_sourcepaths == nil && len(j.srcFiles) > 0 {
+		j.properties.Local_sourcepaths = append(j.properties.Local_sourcepaths, ".")
 	}
+	j.sourcepaths = android.PathsForModuleSrc(ctx, j.properties.Local_sourcepaths)
 
 	j.argFiles = android.PathsForModuleSrc(ctx, j.properties.Arg_files)
 	argFilesMap := map[string]string{}
@@ -723,7 +748,17 @@
 type Droiddoc struct {
 	Javadoc
 
-	properties DroiddocProperties
+	properties        DroiddocProperties
+	apiFile           android.WritablePath
+	privateApiFile    android.WritablePath
+	removedApiFile    android.WritablePath
+	removedDexApiFile android.WritablePath
+
+	checkCurrentApiTimestamp      android.WritablePath
+	updateCurrentApiTimestamp     android.WritablePath
+	checkLastReleasedApiTimestamp android.WritablePath
+
+	apiFilePath android.Path
 }
 
 // droiddoc converts .java source files to documentation using doclava or dokka.
@@ -748,18 +783,17 @@
 	return module
 }
 
-func (d *Droiddoc) OutputFiles(tag string) (android.Paths, error) {
-	switch tag {
-	case "", ".docs.zip":
-		return android.Paths{d.Javadoc.docZip}, nil
-	default:
-		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
-	}
+func (d *Droiddoc) ApiFilePath() android.Path {
+	return d.apiFilePath
 }
 
 func (d *Droiddoc) DepsMutator(ctx android.BottomUpMutatorContext) {
 	d.Javadoc.addDeps(ctx)
 
+	if Bool(d.properties.Check_api.Ignore_missing_latest_api) {
+		ignoreMissingModules(ctx, &d.properties.Check_api.Last_released)
+	}
+
 	if String(d.properties.Custom_template) != "" {
 		ctx.AddDependency(ctx.Module(), droiddocTemplateTag, String(d.properties.Custom_template))
 	}
@@ -839,6 +873,41 @@
 	}
 }
 
+func (d *Droiddoc) createStubs() bool {
+	return BoolDefault(d.properties.Create_stubs, false)
+}
+
+func (d *Droiddoc) stubsFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsDir android.WritablePath) {
+	if apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") ||
+		apiCheckEnabled(ctx, d.properties.Check_api.Last_released, "last_released") ||
+		String(d.properties.Api_filename) != "" {
+
+		d.apiFile = android.PathForModuleOut(ctx, ctx.ModuleName()+"_api.txt")
+		cmd.FlagWithOutput("-api ", d.apiFile)
+		d.apiFilePath = d.apiFile
+	}
+
+	if apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") ||
+		apiCheckEnabled(ctx, d.properties.Check_api.Last_released, "last_released") ||
+		String(d.properties.Removed_api_filename) != "" {
+		d.removedApiFile = android.PathForModuleOut(ctx, ctx.ModuleName()+"_removed.txt")
+		cmd.FlagWithOutput("-removedApi ", d.removedApiFile)
+	}
+
+	if String(d.properties.Removed_dex_api_filename) != "" {
+		d.removedDexApiFile = android.PathForModuleOut(ctx, String(d.properties.Removed_dex_api_filename))
+		cmd.FlagWithOutput("-removedDexApi ", d.removedDexApiFile)
+	}
+
+	if d.createStubs() {
+		cmd.FlagWithArg("-stubs ", stubsDir.String())
+	}
+
+	if Bool(d.properties.Write_sdk_values) {
+		cmd.FlagWithArg("-sdkvalues ", android.PathForModuleOut(ctx, "out").String())
+	}
+}
+
 func (d *Droiddoc) postDoclavaCmds(ctx android.ModuleContext, rule *android.RuleBuilder) {
 	if String(d.properties.Static_doc_index_redirect) != "" {
 		staticDocIndexRedirect := android.PathForModuleSrc(ctx, String(d.properties.Static_doc_index_redirect))
@@ -941,15 +1010,22 @@
 	deps := d.Javadoc.collectDeps(ctx)
 
 	d.Javadoc.docZip = android.PathForModuleOut(ctx, ctx.ModuleName()+"-"+"docs.zip")
+	d.Javadoc.stubsSrcJar = android.PathForModuleOut(ctx, ctx.ModuleName()+"-"+"stubs.srcjar")
 
 	jsilver := android.PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "framework", "jsilver.jar")
 	doclava := android.PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "framework", "doclava.jar")
+	java8Home := ctx.Config().Getenv("ANDROID_JAVA8_HOME")
+	checkApiClasspath := classpath{jsilver, doclava, android.PathForSource(ctx, java8Home, "lib/tools.jar")}
 
 	outDir := android.PathForModuleOut(ctx, "out")
 	srcJarDir := android.PathForModuleOut(ctx, "srcjars")
+	stubsDir := android.PathForModuleOut(ctx, "stubsDir")
 
 	rule := android.NewRuleBuilder()
 
+	rule.Command().Text("rm -rf").Text(outDir.String()).Text(stubsDir.String())
+	rule.Command().Text("mkdir -p").Text(outDir.String()).Text(stubsDir.String())
+
 	srcJarList := zipSyncCmd(ctx, rule, srcJarDir, d.Javadoc.srcJars)
 
 	var cmd *android.RuleBuilderCommand
@@ -960,6 +1036,8 @@
 			deps.bootClasspath, deps.classpath, d.Javadoc.sourcepaths)
 	}
 
+	d.stubsFlags(ctx, cmd, stubsDir)
+
 	cmd.Flag(strings.Join(d.Javadoc.args, " ")).Implicits(d.Javadoc.argFiles)
 
 	if d.properties.Compat_config != nil {
@@ -989,11 +1067,120 @@
 		FlagWithArg("-C ", outDir.String()).
 		FlagWithArg("-D ", outDir.String())
 
+	rule.Command().
+		BuiltTool(ctx, "soong_zip").
+		Flag("-write_if_changed").
+		Flag("-jar").
+		FlagWithOutput("-o ", d.stubsSrcJar).
+		FlagWithArg("-C ", stubsDir.String()).
+		FlagWithArg("-D ", stubsDir.String())
+
 	rule.Restat()
 
 	zipSyncCleanupCmd(rule, srcJarDir)
 
 	rule.Build(pctx, ctx, "javadoc", desc)
+
+	if apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") {
+		apiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Current.Api_file))
+		removedApiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Current.Removed_api_file))
+
+		d.checkCurrentApiTimestamp = android.PathForModuleOut(ctx, "check_current_api.timestamp")
+
+		rule := android.NewRuleBuilder()
+
+		rule.Command().Text("( true")
+
+		rule.Command().
+			BuiltTool(ctx, "apicheck").
+			Flag("-JXmx1024m").
+			FlagWithInputList("-Jclasspath\\ ", checkApiClasspath.Paths(), ":").
+			OptionalFlag(d.properties.Check_api.Current.Args).
+			Input(apiFile).
+			Input(d.apiFile).
+			Input(removedApiFile).
+			Input(d.removedApiFile)
+
+		msg := fmt.Sprintf(`\n******************************\n`+
+			`You have tried to change the API from what has been previously approved.\n\n`+
+			`To make these errors go away, you have two choices:\n`+
+			`   1. You can add '@hide' javadoc comments to the methods, etc. listed in the\n`+
+			`      errors above.\n\n`+
+			`   2. You can update current.txt by executing the following command:\n`+
+			`         make %s-update-current-api\n\n`+
+			`      To submit the revised current.txt to the main Android repository,\n`+
+			`      you will need approval.\n`+
+			`******************************\n`, ctx.ModuleName())
+
+		rule.Command().
+			Text("touch").Output(d.checkCurrentApiTimestamp).
+			Text(") || (").
+			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
+			Text("; exit 38").
+			Text(")")
+
+		rule.Build(pctx, ctx, "doclavaCurrentApiCheck", "check current API")
+
+		d.updateCurrentApiTimestamp = android.PathForModuleOut(ctx, "update_current_api.timestamp")
+
+		// update API rule
+		rule = android.NewRuleBuilder()
+
+		rule.Command().Text("( true")
+
+		rule.Command().
+			Text("cp").Flag("-f").
+			Input(d.apiFile).Flag(apiFile.String())
+
+		rule.Command().
+			Text("cp").Flag("-f").
+			Input(d.removedApiFile).Flag(removedApiFile.String())
+
+		msg = "failed to update public API"
+
+		rule.Command().
+			Text("touch").Output(d.updateCurrentApiTimestamp).
+			Text(") || (").
+			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
+			Text("; exit 38").
+			Text(")")
+
+		rule.Build(pctx, ctx, "doclavaCurrentApiUpdate", "update current API")
+	}
+
+	if apiCheckEnabled(ctx, d.properties.Check_api.Last_released, "last_released") {
+		apiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Last_released.Api_file))
+		removedApiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Last_released.Removed_api_file))
+
+		d.checkLastReleasedApiTimestamp = android.PathForModuleOut(ctx, "check_last_released_api.timestamp")
+
+		rule := android.NewRuleBuilder()
+
+		rule.Command().
+			Text("(").
+			BuiltTool(ctx, "apicheck").
+			Flag("-JXmx1024m").
+			FlagWithInputList("-Jclasspath\\ ", checkApiClasspath.Paths(), ":").
+			OptionalFlag(d.properties.Check_api.Last_released.Args).
+			Input(apiFile).
+			Input(d.apiFile).
+			Input(removedApiFile).
+			Input(d.removedApiFile)
+
+		msg := `\n******************************\n` +
+			`You have tried to change the API from what has been previously released in\n` +
+			`an SDK.  Please fix the errors listed above.\n` +
+			`******************************\n`
+
+		rule.Command().
+			Text("touch").Output(d.checkLastReleasedApiTimestamp).
+			Text(") || (").
+			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
+			Text("; exit 38").
+			Text(")")
+
+		rule.Build(pctx, ctx, "doclavaLastApiCheck", "check last API")
+	}
 }
 
 //
diff --git a/java/java_test.go b/java/java_test.go
index d75be18..0e93611 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1082,26 +1082,16 @@
 		    srcs: ["bar-doc/IBar.aidl"],
 		    path: "bar-doc",
 		}
-		droidstubs {
-		    name: "bar-stubs",
-		    srcs: [
-		        "bar-doc/a.java",
-		    ],
-		    exclude_srcs: [
-		        "bar-doc/b.java"
-		    ],
-		    api_levels_annotations_dirs: [
-		      "droiddoc-templates-sdk",
-		    ],
-		    api_levels_annotations_enabled: true,
-		}
 		droiddoc {
 		    name: "bar-doc",
 		    srcs: [
-		        ":bar-stubs",
+		        "bar-doc/a.java",
 		        "bar-doc/IFoo.aidl",
 		        ":bar-doc-aidl-srcs",
 		    ],
+		    exclude_srcs: [
+		        "bar-doc/b.java"
+		    ],
 		    custom_template: "droiddoc-templates-sdk",
 		    hdf: [
 		        "android.whichdoc offline",
@@ -1118,29 +1108,23 @@
 			"bar-doc/a.java": nil,
 			"bar-doc/b.java": nil,
 		})
-	barStubs := ctx.ModuleForTests("bar-stubs", "android_common")
-	barStubsOutputs, err := barStubs.Module().(*Droidstubs).OutputFiles("")
-	if err != nil {
-		t.Errorf("Unexpected error %q retrieving \"bar-stubs\" output file", err)
-	}
-	if len(barStubsOutputs) != 1 {
-		t.Errorf("Expected one output from \"bar-stubs\" got %s", barStubsOutputs)
+	barDocModule := ctx.ModuleForTests("bar-doc", "android_common")
+	barDoc := barDocModule.Rule("javadoc")
+	notExpected := " -stubs "
+	if strings.Contains(barDoc.RuleParams.Command, notExpected) {
+		t.Errorf("bar-doc command contains flag %q to create stubs, but should not", notExpected)
 	}
 
-	barStubsOutput := barStubsOutputs[0]
-	barDoc := ctx.ModuleForTests("bar-doc", "android_common")
-	javaDoc := barDoc.Rule("javadoc")
-	if g, w := javaDoc.Implicits.Strings(), barStubsOutput.String(); !inList(w, g) {
-		t.Errorf("implicits of bar-doc must contain %q, but was %q.", w, g)
+	var javaSrcs []string
+	for _, i := range barDoc.Inputs {
+		javaSrcs = append(javaSrcs, i.Base())
+	}
+	if len(javaSrcs) != 1 || javaSrcs[0] != "a.java" {
+		t.Errorf("inputs of bar-doc must be []string{\"a.java\"}, but was %#v.", javaSrcs)
 	}
 
-	expected := "-sourcepath " + buildDir + "/.intermediates/bar-doc/android_common/srcjars "
-	if !strings.Contains(javaDoc.RuleParams.Command, expected) {
-		t.Errorf("bar-doc command does not contain flag %q, but should\n%q", expected, javaDoc.RuleParams.Command)
-	}
-
-	aidl := barDoc.Rule("aidl")
-	if g, w := javaDoc.Implicits.Strings(), aidl.Output.String(); !inList(w, g) {
+	aidl := barDocModule.Rule("aidl")
+	if g, w := barDoc.Implicits.Strings(), aidl.Output.String(); !inList(w, g) {
 		t.Errorf("implicits of bar-doc must contain %q, but was %q.", w, g)
 	}
 
@@ -1160,26 +1144,16 @@
 		    srcs: ["bar-doc/IBar.aidl"],
 		    path: "bar-doc",
 		}
-		droidstubs {
-		    name: "bar-stubs",
-		    srcs: [
-		        "bar-doc/a.java",
-		    ],
-		    exclude_srcs: [
-		        "bar-doc/b.java"
-		    ],
-		    api_levels_annotations_dirs: [
-		      "droiddoc-templates-sdk",
-		    ],
-		    api_levels_annotations_enabled: true,
-		}
 		droiddoc {
 		    name: "bar-doc",
 		    srcs: [
-		        ":bar-stubs",
+		        "bar-doc/a.java",
 		        "bar-doc/IFoo.aidl",
 		        ":bar-doc-aidl-srcs",
 		    ],
+		    exclude_srcs: [
+		        "bar-doc/b.java"
+		    ],
 		    custom_template: "droiddoc-templates-sdk",
 		    hdf: [
 		        "android.whichdoc offline",