如何将第三方库添加到Android AOSP构建中？

Question

如何将第三方库添加到Android AOSP构建中？

11

我正在尝试将Jackson JSON库添加到我的AOSP项目中。我能够编译我的项目并将其刷入手机，但我遇到了一个运行时错误：

E/JavaBinder( 1689): java.lang.NoClassDefFoundError: Failed resolution of: Lcom/fasterxml/jackson/core/JsonFactory;
...
E/JavaBinder( 1689): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.fasterxml.jackson.core.JsonFactory" on path: DexPathList[[zip file "/system/framework/guice.jar", zip file "/system/framework/beanshell.jar", zip file "/system/framework/services.jar", zip file "/system/framework/ethernet-service.jar", zip file "/system/framework/wifi-service.jar"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

我尝试过从源码和jar包中引入Jackson。下面是每个Android.mk文件的内容：

SOURCE Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(call all-java-files-under,.)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE:= com.fasterxml.jackson.core
include $(BUILD_JAVA_LIBRARY)

# Copy XML to /system/etc/permissions/
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE := com.fasterxml.jackson.core.xml
LOCAL_MODULE_CLASS := ETC
LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/permissions
LOCAL_SRC_FILES := $(LOCAL_MODULE)
include $(BUILD_PREBUILT)

源代码来自于com.fasterxml.jackson.core.xml（如上所述）

<?xml version="1.0" encoding="utf-8"?>
<permissions>
    <library name="com.fasterxml.jackson.core.xml"
        file="/system/framework/com.fasterxml.jackson.jar" />
</permissions>

JAR Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := jackson
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := jackson-core-2.5.0.jar
LOCAL_MODULE_CLASS := JAVA_LIBRARIES
LOCAL_MODULE_SUFFIX := $(COMMON_JAVA_PACKAGE_SUFFIX)
include $(BUILD_PREBUILT)

我还在Android.mk文件的LOCAL_JAVA_LIBRARIES :=部分中添加了一个jackson条目，以便在使用Jackson（frameworks/base/services）时使用。无论我尝试什么，我都会得到一个ClassNotFoundException。

我错过了什么？我做了不必要的事情吗？

- BLuFeNiX

可能是重复的问题，类似于https://dev59.com/e3XZa4cB1Zd3GeqPAfcJ。看起来你需要在你的清单文件中添加一个依赖项<uses-library android:name="yourlib" />。 - Mixaz

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- BLuFeNiX · Accepted Answer

要包含第三方库的源代码:

将库的源代码复制到$ANDROID_BUILD_TOP/external/目录下的一个文件夹中（例如： $ANDROID_BUILD_TOP/external/jackson）

创建一个Android.mk文件，并将其放在库的文件夹中（例如：$ANDROID_BUILD_TOP/external/jackson/Android.mk

Android.mk的内容如下:

# required (setup the build environment)
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

# optional step to automate some pre-compilation steps for this library
# run `mvn generate-sources` before we compile
$(info $(shell (mvn generate-sources -f $(LOCAL_PATH)/pom.xml)))

# required (the name of the library we are building)
LOCAL_MODULE := jackson

# required (paths to all directories that include source code)
# note the difference between the := (first line) and += (every other line)
LOCAL_SRC_FILES := $(call all-java-files-under, src/main)
LOCAL_SRC_FILES += $(call all-java-files-under, target/generated-sources)

# required (tell the build system what kind of thing we are building)
include $(BUILD_JAVA_LIBRARY)

将库添加到mk文件的PRODUCT_BOOT_JARS部分。你需要编辑哪个文件取决于你正在构建什么（例如：build/target/product/core_minimal.mk）。

PRODUCT_BOOT_JARS := \
    okhttp \
    core-junit \
    bouncycastle \
    ext \
    gson

修改

PRODUCT_BOOT_JARS := \
    okhttp \
    core-junit \
    bouncycastle \
    ext \
    gson \
    jackson

对于您的AOSP项目的每个子模块（例如：frameworks/base），如果您想要访问库，请找到相应的makefile（例如：$ANDROID_BUILD_TOP/frameworks/base/Android.mk），并在LOCAL_JAVA_LIBRARIES行中为您的库添加一个条目。示例：

LOCAL_JAVA_LIBRARIES := guice gson

修改过的

LOCAL_JAVA_LIBRARIES := guice gson jackson

编译你的项目。