将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Settings应用程序，但是我在配置方面有问题。当我试图调用System.loadLibrary("mylibrary")时，我得到了libraryPath=/data/app-lib/com.set-1: find返回null。我知道应用程序会查看/data/ app -lib/.文件夹，但我的库位于system/lib中。

我知道我的.mk文件不好，但我不知道我遗漏了什么，请看它们。

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

我意识到必须在库中添加前缀"lib“，以便从system/lib位置调用它。所以应该是这样的

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。