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闪存到手机上,但出现运行时错误:
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]]
我已经尝试从源代码和 jar 中包含 Jackson。这是我的 Android.mk 文件:
源代码 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)
SOURCE com.fasterxml.jackson.core.xml
(以上引用)
<?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 :=
部分添加了一个 jackson
条目,我想在其中使用 Jackson (frameworks/base/服务
)。无论我尝试了什么,我都会得到一个 ClassNotFoundException
。
我错过了什么?我有没有做过不必要的事情?
最佳答案
要包含来自源的第 3 方库:
- 将库的源代码复制到
$ANDROID_BUILD_TOP/external/
下的目录中(例如:$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:
# 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 $(BUILD_JAVA_LIBRARY)
将库添加到
mk
文件的PRODUCT_BOOT_JARS
部分。您编辑哪个文件取决于您正在构建什么(例如:build/target/product/core_minimal.mk
)原创
PRODUCT_BOOT_JARS := \ okhttp \ core-junit \ bouncycastle \ ext \ gson
已修改
PRODUCT_BOOT_JARS := \ okhttp \ core-junit \ bouncycastle \ ext \ gson \ jackson
对于您的 AOSP 项目(例如:
frameworks/base
)的每个子模块,您希望访问该库,找到 makefile(例如:$ANDROID_BUILD_TOP/frameworks/base/Android.mk
并将您的库的条目添加到LOCAL_JAVA_LIBRARIES
行。示例:原创
LOCAL_JAVA_LIBRARIES := guice gson
已修改
LOCAL_JAVA_LIBRARIES := guice gson jackson
编译您的项目。
关于java - 如何将第 3 方库添加到 Android AOSP 构建中?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32186980/