问题描述
我的Android源存储库已经分别在prebuilts/sdk/current/extras/constraint-layout/libs/和prebuilts/sdk/current/extras/constraint-layout-solver/处具有两个jar文件android-support-constraint-layout.jar和android-support-constraint-layout-solver.jar.现在，我在packages/app中有一个应用，其中有一个app/src/main/Android.mk:
My Android source repo already has two jar files android-support-constraint-layout.jar and android-support-constraint-layout-solver.jar respectively at prebuilts/sdk/current/extras/constraint-layout/libs/ and prebuilts/sdk/current/extras/constraint-layout-solver/. Now, I have an app in packages/app, where I have an app/src/main/Android.mk:
LOCAL_STATIC_ANDROID_LIBRARIES := \
...
android-support-constraint-layout \
android-support-constraint-layout-solver
仍然，编译Android后出现以下错误:
Still, I get the following error after compiling Android:
error: FirstApp (APPS android-x86) missing android-support-constraint-layout (JAVA_LIBRARIES android-x86)
You can set ALLOW_MISSING_DEPENDENCIES=true in your environment if this is intentional, but that may defer real problems until later in the build.
error: FirstApp (APPS android-x86) missing android-support-constraint-layout-solver (JAVA_LIBRARIES android-x86)
除了第一个，中的任何方法此链接用于在AOSP中添加约束布局.
Except the first, none of the methods in this link works to add constraint-layout in AOSP.
推荐答案
我在AOSP for Android-Oreo(v8.1)的一个软件包中添加了约束布局.
I added constraint-layout in one of the packages in AOSP for Android-Oreo (v8.1).
从maven存储库下载constraint-layout(.aar)和constraint-layout-solver(.jar): https://mvnrepository.com/artifact/com.android.support.constraint/constraint-layout/1.0.2 ， https://mvnrepository.com/artifact/com.android.support.constraint/constraint-layout-solver/1.0.2 将它们放在应用程序主目录(packages/apps/AnotherFirstApp/)中的libs/文件夹中.
Download the constraint-layout (.aar) and constraint-layout-solver (.jar) from maven repository: https://mvnrepository.com/artifact/com.android.support.constraint/constraint-layout/1.0.2,https://mvnrepository.com/artifact/com.android.support.constraint/constraint-layout-solver/1.0.2Put them in the libs/ folder in the app's home (packages/apps/AnotherFirstApp/).
在Android.mk中:
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_PACKAGE_NAME := AnotherFirstApp
LOCAL_MODULE_TAGS := optional
LOCAL_DEX_PREOPT := false
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_PROGUARD_FLAG_FILES := ../../../frameworks/support/design/proguard-rules.pro
ifeq ($(TARGET_BUILD_APPS),)
support_library_root_dir := frameworks/support
else
support_library_root_dir := prebuilts/sdk/current/support
endif
LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res \
$(support_library_root_dir)/design/res \
$(support_library_root_dir)/v7/cardview/res \
$(support_library_root_dir)/v7/recyclerview/res \
$(support_library_root_dir)/v7/appcompat/res
LOCAL_AAPT_FLAGS := \
--auto-add-overlay \
--extra-packages android.support.design \
--extra-packages android.support.v7.cardview \
--extra-packages android.support.constraint \
--extra-packages android.support.v7.recyclerview \
--extra-packages android.support.v7.appcompat
LOCAL_STATIC_JAVA_LIBRARIES := \
android-support-design \
android-support-v7-recyclerview \
android-support-v4 \
android-support-v7-cardview \
android-support-v7-appcompat \
constraint-layout-solver \
LOCAL_STATIC_JAVA_AAR_LIBRARIES := \
constraint-layout
include $(BUILD_PACKAGE)
include $(CLEAR_VARS)
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := \
constraint-layout:libs/constraint-layout-1.0.2.aar \
constraint-layout-solver:libs/constraint-layout-solver-1.0.2.jar
include $(BUILD_MULTI_PREBUILT)
include $(call all-makefiles-under,$(LOCAL_PATH))
现在，没有问题.该应用程序可以构建并正常运行.由于未以共享jar之类的方式添加constraint-solver，因此可能存在一个问题，以防其他应用程序也尝试使用此jar.这需要通过在framework或external中添加此jar来解决.
Now, there's no problem. The app builds and runs fine. There might be one issue because of not adding constraint-solver in a way like shared jar, in case other apps are also trying to use this jar. This needs to be handled by adding this jar in the framework or external.
我从以下博客中获得了帮助:
I got help from the following blogs:
- https://sites.google.com/site/sbobovyc/home/Programming/a/creating-system-app
- http://saurabhsharma123k .blogspot.com/2017/03/add-and-use-external-library-or-jar.html
- https://kevinaboos.wordpress.com/2016/10/29/adding-an-external-library-or-jarfile-to-android-frameworks/
- https://github.com/BrahmaOS/brahmaos-packages-apps-GoodWeather/blob/master/Android.mk
- https://sites.google.com/site/sbobovyc/home/Programming/a/creating-system-app
- http://saurabhsharma123k.blogspot.com/2017/03/add-and-use-external-library-or-jar.html
- https://kevinaboos.wordpress.com/2016/10/29/adding-an-external-library-or-jarfile-to-android-frameworks/
- https://github.com/BrahmaOS/brahmaos-packages-apps-GoodWeather/blob/master/Android.mk
这篇关于错误:AOSP中缺少android-support-constraint-layout，但是prebuilts/sdk/current/extras有它的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！