Error: missing android-support-constraint-layout in AOSP but prebuilts/sdk/current/extras has it

Question

我的 Android 源代码库已经有两个 jar 文件 android-support-constraint-layout.jar 和 android-support-constraint-layout-solver.jar，分别位于 prebuilts/sdk/current/extras/constraint-layout/libs/ 和 prebuilts/sdk/current/extras/constraint-layout-solver/。现在，我在 packages/app 中有一个应用程序，其中有一个 app/src/main/Android.mk:

LOCAL_STATIC_ANDROID_LIBRARIES := \
...
android-support-constraint-layout \
android-support-constraint-layout-solver

编译后仍然出现以下错误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 none 方法用于在 AOSP 中添加约束布局。

Answer 1

我在 Android-Oreo (v8.1) 的 AOSP 包之一中添加了约束布局。

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 将它们放入应用主页 (packages/apps/AnotherFirstApp/) 的 libs/ 文件夹中。

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，没问题了。该应用程序构建并运行良好。可能存在一个问题，因为没有以共享 jar 的方式添加约束求解器，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 来处理

我从以下博客获得帮助：

Error: missing android-support-constraint-layout in AOSP but prebuilts/sdk/current/extras has it

Error: missing android-support-constraint-layout in AOSP but prebuilts/sdk/current/extras has it

android

android-source

android-constraintlayout