JNI集成到AOSP构建中

Question

我需要通过添加一些自定义库来更改设置应用程序，但我在配置方面遇到了问题。当我尝试调用System.loadLibrary（"mylibrary"）时，我得到libraryPath=/data/app-lib/com.settings-1:find library返回null。我知道这个应用程序会查看/data/app-lib/。。特定库的文件夹，但我的库在system/lib 中

我知道我的.mk文件不好，但我不知道我缺了什么，请看一下。

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_JAVA_LIBRARIES := bouncycastle telephony-common
LOCAL_STATIC_JAVA_LIBRARIES := guava android-support-v4 jsr305
ifdef DOLBY_DAP
LOCAL_JAVA_LIBRARIES += framework_ext
else
LOCAL_STATIC_JAVA_LIBRARIES += libsds
endif #DOLBY_DAP
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_PACKAGE_NAME := Settings
LOCAL_CERTIFICATE := platform
# If this is an unbundled build (to install seprately) then include
# the libraries in the APK, otherwise just put them in /system/lib and
# leave them out of the APK
ifneq (,$(TARGET_BUILD_APPS))
  LOCAL_JNI_SHARED_LIBRARIES := efuse_tool
else
  LOCAL_REQUIRED_MODULES := efuse_tool
endif
LOCAL_PROGUARD_FLAG_FILES := proguard.flags
include $(BUILD_PACKAGE)
include $(call all-makefiles-under, jni)
ifndef DOLBY_DAP
include $(CLEAR_VARS)
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libsds:ds.jar
include $(BUILD_MULTI_PREBUILT)
endif
# Use the folloing include to make our test apk.
include $(call all-makefiles-under,$(LOCAL_PATH))

和jni文件夹中的.mk文件

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Here we give our module name and source file(s)
LOCAL_SRC_FILES := efuse_tool.c
LOCAL_MODULE    := efuse_tool
include $(BUILD_SHARED_LIBRARY)

Answer 1

我意识到我必须在库中添加前缀"lib"，这样才能从system/lib位置调用它。所以它应该看起来像这个

ifneq (,$(TARGET_BUILD_APPS))
  LOCAL_JNI_SHARED_LIBRARIES := libefuse_tool
else
  LOCAL_REQUIRED_MODULES := libefuse_tool
endif

LOCAL_MODULE    := libefuse_tool

我还可以删除LOCAL_JNI_SHARED_LIBRARIES:=libefuse_tool，因为它永远不会被使用。