Question

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新到手机，但我收到运行时错误：

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]]

我试过从源头和jar中包括杰克逊。以下是我的每个Android.mk文件：

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)

SOURCE com.fasterxml.jackson.core.xml（上文引用）

<?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jackson部分添加了LOCAL_JAVA_LIBRARIES :=条目，我想要使用Jackson（frameworks/base/services）。无论我尝试过什么，我都会得到ClassNotFoundException。

我错过了什么？我做了什么不必要的事吗？

Answer 1

要包含第三方库来自：

将图书馆的来源复制到$ANDROID_BUILD_TOP/external/下的目录中（例如：$ANDROID_BUILD_TOP/external/jackson）

创建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PRODUCT_BOOT_JARS文件的mk部分。您编辑的文件取决于您正在构建的内容（例如：build/target/product/core_minimal.mk）

<强>原始

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

<强>修饰

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），您想要访问该库，找到makefile （例如：$ANDROID_BUILD_TOP/frameworks/base/Android.mk并将您的资料库条目添加到LOCAL_JAVA_LIBRARIES行。示例：

<强>原始
```
LOCAL_JAVA_LIBRARIES := guice gson
```
<强>修饰
```
LOCAL_JAVA_LIBRARIES := guice gson jackson
```
编译项目。

如何将第三方库添加到Android AOSP构建中？

1 个答案: