Android 如何在AOSP构建期间使用约束布局，而不包括external.aar和.jar

我正试图通过在AOSP源代码中构建一个模块来构建基于java的android应用程序。我的应用程序使用android.support.constraint.ConstraintLayout。但是，我没有找到在我的

Android.mk

中包含约束布局依赖项的直接方法

我已将我的项目置于

AOSP_ROOT/packages/apps

下，并尝试使用此

Android.mk

：

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

LOCAL_STATIC_JAVA_AAR_LIBRARIES := \
    android-support-constraint-layout

include $(BUILD_PACKAGE)

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_USE_AAPT2 := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_ANDROID_LIBRARIES:= \
    android-support-constraint-layout

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

include $(BUILD_PACKAGE)

但是，这会产生生成错误：

ninja:error:'out/target/common/obj/JAVA_LIBRARIES/android-support-constraint-layou_intermediates/aar/classes.jar'所需的'out/target/common/obj/APPS/MyApp_intermediates/AndroidManifest.xml'缺少并且没有已知的规则 20:57:54忍者失败：退出状态1

据我所知，它正在搜索可以从

.aar

文件构建的

classes.jar

，但它丢失了。然而，这里的答案解决了这个问题：

但是，问题是，这个答案建议在我的项目

libs

目录中添加外部

constraint layout.aar

和

constraint layout solver.jar

---

我的问题是，是否可以使用AOSP内的内置库在我的项目中添加

约束布局
支持，而不向我的项目中添加外部
.aar
和
.jar
？
，总之，我找到了解决方案。无需在项目
libs
中包含
约束布局
，作为额外库

为了解决这个问题，我们需要在Android.mk中增加一行：

LOCAL\u USE\u AAPT2:=true

也可以使用
LOCAL\u STATIC\u ANDROID\u库
，而不是
LOCAL\u STATIC\u JAVA\u AAR\u库

这是正在工作的Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

LOCAL_STATIC_JAVA_AAR_LIBRARIES := \
    android-support-constraint-layout

include $(BUILD_PACKAGE)

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_USE_AAPT2 := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_ANDROID_LIBRARIES:= \
    android-support-constraint-layout

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

include $(BUILD_PACKAGE)

不管怎样，我已经找到了解决办法。无需在项目
libs
中包含
约束布局
，作为额外库

为了解决这个问题，我们需要在Android.mk中增加一行：

LOCAL\u USE\u AAPT2:=true

也可以使用
LOCAL\u STATIC\u ANDROID\u库
，而不是
LOCAL\u STATIC\u JAVA\u AAR\u库

这是正在工作的Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

LOCAL_STATIC_JAVA_AAR_LIBRARIES := \
    android-support-constraint-layout

include $(BUILD_PACKAGE)

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_PRIVILEGED_MODULE := true                 
LOCAL_PACKAGE_NAME := MyApp
LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_USE_AAPT2 := true

LOCAL_SRC_FILES := $(call all-java-files-under, java) 
LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_AAPT_FLAGS := \
    --auto-add-overlay \
    --extra-packages android.support.constraint

LOCAL_STATIC_ANDROID_LIBRARIES:= \
    android-support-constraint-layout

LOCAL_STATIC_JAVA_LIBRARIES := \
    android-common \
    android-support-v4 \
    android-support-constraint-layout-solver

include $(BUILD_PACKAGE)