No matching variant android_app_import fix

This fixes a bug where android_app_import or android_test_import without
a matching variant or a default apk property value breaks the build.

Test: app_test.go
Fixes: 152343232
Change-Id: I8215aa1a6dad74b503eaa1169a64f8c30dda287c

android/prebuilt.go

@@ -178,6 +178,9 @@ func InitSingleSourcePrebuiltModule(module PrebuiltInterface, srcProps interface
 	srcPropertyName := proptools.PropertyNameForField(srcField)
 
 	srcsSupplier := func(ctx BaseModuleContext) []string {
+		if !ctx.Module().Enabled() {
+			return nil
+		}
 		value := srcPropsValue.FieldByIndex(srcFieldIndex)
 		if value.Kind() == reflect.Ptr {
 			value = value.Elem()

java/app.go

@@ -1400,6 +1400,13 @@ func (a *AndroidAppImport) processVariants(ctx android.LoadHookContext) {
 	archProps := reflect.ValueOf(a.archVariants).Elem().FieldByName("Arch")
 	archType := ctx.Config().AndroidFirstDeviceTarget.Arch.ArchType
 	MergePropertiesFromVariant(ctx, &a.properties, archProps, archType.Name)
+
+	if String(a.properties.Apk) == "" {
+		// Disable this module since the apk property is still empty after processing all matching
+		// variants. This likely means there is no matching variant, and the default variant doesn't
+		// have an apk property value either.
+		a.Disable()
+	}
 }
 
 func MergePropertiesFromVariant(ctx android.EarlyModuleContext,

java/app_test.go

@@ -2524,6 +2524,24 @@ func TestAndroidAppImport_ArchVariants(t *testing.T) {
 			`,
 			expected: "prebuilts/apk/app.apk",
 		},
+		{
+			name: "no matching arch without default",
+			bp: `
+				android_app_import {
+					name: "foo",
+					arch: {
+						arm: {
+							apk: "prebuilts/apk/app_arm.apk",
+						},
+					},
+					presigned: true,
+					dex_preopt: {
+						enabled: true,
+					},
+				}
+			`,
+			expected: "",
+		},
 	}
 
 	jniRuleRe := regexp.MustCompile("^if \\(zipinfo (\\S+)")
@@ -2531,6 +2549,12 @@ func TestAndroidAppImport_ArchVariants(t *testing.T) {
 		ctx, _ := testJava(t, test.bp)
 
 		variant := ctx.ModuleForTests("foo", "android_common")
+		if test.expected == "" {
+			if variant.Module().Enabled() {
+				t.Error("module should have been disabled, but wasn't")
+			}
+			continue
+		}
 		jniRuleCommand := variant.Output("jnis-uncompressed/foo.apk").RuleParams.Command
 		matches := jniRuleRe.FindStringSubmatch(jniRuleCommand)
 		if len(matches) != 2 {