Propagate java resources in apps with no code

Use the java resources jar as the dex jar when building apps that
have no code.

Also remove maybeStrippedDexJar, the dex jar is never stripped now.

Fixes: 176305357
Test: TestAppJavaResources
Change-Id: Ic8b1165bd35d71237d307e7f5f895764e203a10d

java/androidmk.go

@@ -220,7 +220,7 @@ func (prebuilt *DexImport) AndroidMkEntries() []android.AndroidMkEntries {
 	}
 	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
-		OutputFile: android.OptionalPathForPath(prebuilt.maybeStrippedDexJarFile),
+		OutputFile: android.OptionalPathForPath(prebuilt.dexJarFile),
 		Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
 		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
 			func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {

java/app.go

@@ -469,7 +469,7 @@ func (a *AndroidApp) dexBuildActions(ctx android.ModuleContext) android.Path {
 		a.Module.compile(ctx, a.aaptSrcJar)
 	}
 
-	return a.maybeStrippedDexJarFile
+	return a.dexJarFile
 }
 
 func (a *AndroidApp) jniBuildActions(jniLibs []jniLib, ctx android.ModuleContext) android.WritablePath {

java/app_test.go

@@ -685,6 +685,51 @@ func TestLibraryAssets(t *testing.T) {
 	}
 }
 
+func TestAppJavaResources(t *testing.T) {
+	bp := `
+			android_app {
+				name: "foo",
+				sdk_version: "current",
+				java_resources: ["resources/a"],
+				srcs: ["a.java"],
+			}
+
+			android_app {
+				name: "bar",
+				sdk_version: "current",
+				java_resources: ["resources/a"],
+			}
+		`
+
+	ctx := testApp(t, bp)
+
+	foo := ctx.ModuleForTests("foo", "android_common")
+	fooResources := foo.Output("res/foo.jar")
+	fooDexJar := foo.Output("dex-withres/foo.jar")
+	fooDexJarAligned := foo.Output("dex-withres-aligned/foo.jar")
+	fooApk := foo.Rule("combineApk")
+
+	if g, w := fooDexJar.Inputs.Strings(), fooResources.Output.String(); !android.InList(w, g) {
+		t.Errorf("expected resource jar %q in foo dex jar inputs %q", w, g)
+	}
+
+	if g, w := fooDexJarAligned.Input.String(), fooDexJar.Output.String(); g != w {
+		t.Errorf("expected dex jar %q in foo aligned dex jar inputs %q", w, g)
+	}
+
+	if g, w := fooApk.Inputs.Strings(), fooDexJarAligned.Output.String(); !android.InList(w, g) {
+		t.Errorf("expected aligned dex jar %q in foo apk inputs %q", w, g)
+	}
+
+	bar := ctx.ModuleForTests("bar", "android_common")
+	barResources := bar.Output("res/bar.jar")
+	barApk := bar.Rule("combineApk")
+
+	if g, w := barApk.Inputs.Strings(), barResources.Output.String(); !android.InList(w, g) {
+		t.Errorf("expected resources jar %q in bar apk inputs %q", w, g)
+	}
+}
+
 func TestAndroidResources(t *testing.T) {
 	testCases := []struct {
 		name                       string

java/java.go

@@ -434,9 +434,6 @@ type Module struct {
 	// output file containing classes.dex and resources
 	dexJarFile android.Path
 
-	// output file that contains classes.dex if it should be in the output file
-	maybeStrippedDexJarFile android.Path
-
 	// output file containing uninstrumented classes that will be instrumented by jacoco
 	jacocoReportClassesFile android.Path
 
@@ -1818,8 +1815,8 @@ func (j *Module) compile(ctx android.ModuleContext, aaptSrcJar android.Path) {
 		}
 	}
 
-	if ctx.Device() && j.hasCode(ctx) &&
-		(Bool(j.properties.Installable) || Bool(j.dexProperties.Compile_dex)) {
+	if ctx.Device() && (Bool(j.properties.Installable) || Bool(j.dexProperties.Compile_dex)) {
+		if j.hasCode(ctx) {
 			if j.shouldInstrumentStatic(ctx) {
 				j.dexer.extraProguardFlagFiles = append(j.dexer.extraProguardFlagFiles,
 					android.PathForSource(ctx, "build/make/core/proguard.jacoco.flags"))
@@ -1855,9 +1852,13 @@ func (j *Module) compile(ctx android.ModuleContext, aaptSrcJar android.Path) {
 			// Dexpreopting
 			j.dexpreopt(ctx, dexOutputFile)
 
-		j.maybeStrippedDexJarFile = dexOutputFile
-
 			outputFile = dexOutputFile
+		} else {
+			// There is no code to compile into a dex jar, make sure the resources are propagated
+			// to the APK if this is an app.
+			outputFile = implementationAndResourcesJar
+			j.dexJarFile = j.resourceJar
+		}
 
 		if ctx.Failed() {
 			return
@@ -3184,7 +3185,6 @@ type DexImport struct {
 	properties DexImportProperties
 
 	dexJarFile android.Path
-	maybeStrippedDexJarFile android.Path
 
 	dexpreopter
 
@@ -3271,8 +3271,6 @@ func (j *DexImport) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 
 	j.dexpreopt(ctx, dexOutputFile)
 
-	j.maybeStrippedDexJarFile = dexOutputFile
-
 	if apexInfo.IsForPlatform() {
 		ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
 			j.Stem()+".jar", dexOutputFile)