Android源码中编译app时报如下错误：

[ 91% 205/223] including system/sepolicy/Android.mk ...
system/sepolicy/Android.mk:57: warning: BOARD_PLAT_PUBLIC_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS instead.
system/sepolicy/Android.mk:62: warning: BOARD_PLAT_PRIVATE_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS instead.
FAILED: ninja: unknown target 'MODULES-IN-packages-apps-HapticTap'
17:40:12 ninja failed with: exit status 1

#### failed to build some targets (01:42 (mm:ss)) ####

解决办法：

查看Android.mk文件是否有"include $(BUILD_PACKAGE)"

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
 #这个主要用于是 eng、user还是 userdebug 版本参与编译; optional值所有版本都参与编译
LOCAL_MODULE_TAGS   := optional
 #编译的java文件文件路径
LOCAL_SRC_FILES := $(call all-java-files-under, app/src/main/java)
 #需要编译的 AndroidManifest.xml 文件
LOCAL_MANIFEST_FILE := app/src/main/AndroidManifest.xml
 #编译的资源文件文件路径
LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/app/src/main/res
 #编译出的apk的名称
LOCAL_PACKAGE_NAME := hapticTap
 #apk 签名
LOCAL_CERTIFICATE := platform

LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_USE_AAPT2 := true

LOCAL_STATIC_ANDROID_LIBRARIES  := \
    androidx.core_core-ktx \
    androidx.appcompat_appcompat \
    com.google.android.material_material \
    androidx-constraintlayout_constraintlayout \

include $(BUILD_PACKAGE)
include $(call all-makefiles-under,$(LOCAL_PATH))