⑴ android 怎麼編譯so文件
android NDK編譯多個so文件
android編譯系統的makefile文件Android.mk寫法如下
(1)Android.mk文件首先需要指定LOCAL_PATH變數，用於查找源文件。由於一般情況下
Android.mk和需要編譯的源文件在同一目錄下，所以定義成如下形式：
LOCAL_PATH:=$(call my-dir)
上面的語句的意思是將LOCAL_PATH變數定義成本文件所在目錄路徑。
(2)Android.mk中可以定義多個編譯模塊，每個編譯模塊都是以include $(CLEAR_VARS)開始
以include $(BUILD_XXX)結束。
include $(CLEAR_VARS)
CLEAR_VARS由編譯系統提供，指定讓GNU MAKEFILE為你清除除LOCAL_PATH以外的所有LOCAL_XXX變數，
如LOCAL_MODULE，LOCAL_SRC_FILES，LOCAL_SHARED_LIBRARIES，LOCAL_STATIC_LIBRARIES等。
include $(BUILD_STATIC_LIBRARY)表示編譯成靜態庫
include $(BUILD_SHARED_LIBRARY)表示編譯成動態庫。
include $(BUILD_EXECUTABLE)表示編譯成可執行程序
(3)舉例如下(frameworks/base/libs/audioflinger/Android.mk)：
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS) 模塊一
ifeq ($(AUDIO_POLICY_TEST),true)
ENABLE_AUDIO_DUMP := true
endif
LOCAL_SRC_FILES:= \
AudioHardwareGeneric.cpp \
AudioHardwareStub.cpp \
AudioHardwareInterface.cpp
ifeq ($(ENABLE_AUDIO_DUMP),true)
LOCAL_SRC_FILES += AudioDumpInterface.cpp
LOCAL_CFLAGS += -DENABLE_AUDIO_DUMP
endif
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libbinder \
libmedia \
libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
LOCAL_CFLAGS += -DGENERIC_AUDIO
endif
LOCAL_MODULE:= libaudiointerface
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
LOCAL_SRC_FILES += A2dpAudioInterface.cpp
LOCAL_SHARED_LIBRARIES += liba2dp
LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
LOCAL_C_INCLUDES += $(call include-path-for, bluez)
endif
include $(BUILD_STATIC_LIBRARY) 模塊一編譯成靜態庫
include $(CLEAR_VARS) 模塊二
LOCAL_SRC_FILES:= \
AudioPolicyManagerBase.cpp
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libmedia
ifeq ($(TARGET_SIMULATOR),true)
LOCAL_LDLIBS += -ldl
else
LOCAL_SHARED_LIBRARIES += libdl
endif
LOCAL_MODULE:= libaudiopolicybase
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
LOCAL_CFLAGS += -DWITH_A2DP
endif
ifeq ($(AUDIO_POLICY_TEST),true)
LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
include $(BUILD_STATIC_LIBRARY) 模塊二編譯成靜態庫
include $(CLEAR_VARS) 模塊三
LOCAL_SRC_FILES:= \
AudioFlinger.cpp \
AudioMixer.cpp.arm \
AudioResampler.cpp.arm \
AudioResamplerSinc.cpp.arm \
AudioResamplerCubic.cpp.arm \
AudioPolicyService.cpp
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libbinder \
libmedia \
libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
LOCAL_STATIC_LIBRARIES += libaudiointerface libaudiopolicybase
LOCAL_CFLAGS += -DGENERIC_AUDIO
else
LOCAL_SHARED_LIBRARIES += libaudio libaudiopolicy
endif
ifeq ($(TARGET_SIMULATOR),true)
LOCAL_LDLIBS += -ldl
else
LOCAL_SHARED_LIBRARIES += libdl
endif
LOCAL_MODULE:= libaudioflinger
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
LOCAL_SHARED_LIBRARIES += liba2dp
endif
ifeq ($(AUDIO_POLICY_TEST),true)
LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
ifeq ($(TARGET_SIMULATOR),true)
ifeq ($(HOST_OS),linux)
LOCAL_LDLIBS += -lrt -lpthread
endif
endif
ifeq ($(BOARD_USE_LVMX),true)
LOCAL_CFLAGS += -DLVMX
LOCAL_C_INCLUDES += vendor/nxp
LOCAL_STATIC_LIBRARIES += liblifevibes
LOCAL_SHARED_LIBRARIES += liblvmxservice
# LOCAL_SHARED_LIBRARIES += liblvmxipc
endif
include $(BUILD_SHARED_LIBRARY) 模塊三編譯成動態庫
(4)編譯一個應用程序(APK)
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Build all java files in the java subdirectory-->直譯（建立在java子目錄中的所有Java文件）
LOCAL_SRC_FILES := $(call all-subdir-java-files)
# Name of the APK to build-->直譯（創建APK的名稱）
LOCAL_PACKAGE_NAME := LocalPackage
# Tell it to build an APK-->直譯（告訴它來建立一個APK）
include $(BUILD_PACKAGE)
(5)編譯一個依賴於靜態Java庫(static.jar)的應用程序
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# List of static libraries to include in the package
LOCAL_STATIC_JAVA_LIBRARIES := static-library
# Build all java files in the java subdirectory
LOCAL_SRC_FILES := $(call all-subdir-java-files)
# Name of the APK to build
LOCAL_PACKAGE_NAME := LocalPackage
# Tell it to build an APK
include $(BUILD_PACKAGE)
(6)編譯一個需要用平台的key簽名的應用程序
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Build all java files in the java subdirectory
LOCAL_SRC_FILES := $(call all-subdir-java-files)
# Name of the APK to build
LOCAL_PACKAGE_NAME := LocalPackage
LOCAL_CERTIFICATE := platform
# Tell it to build an APK
include $(BUILD_PACKAGE)
(7)編譯一個需要用特定key前面的應用程序
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Build all java files in the java subdirectory
LOCAL_SRC_FILES := $(call all-subdir-java-files)
# Name of the APK to build
LOCAL_PACKAGE_NAME := LocalPackage
LOCAL_CERTIFICATE := vendor/example/certs/app
# Tell it to build an APK
include $(BUILD_PACKAGE)
(8)添加一個預編譯應用程序
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Mole name should match apk name to be installed.
LOCAL_MODULE := LocalMoleName
LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
include $(BUILD_PREBUILT)
(9)添加一個靜態JAVA庫
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Build all java files in the java subdirectory
LOCAL_SRC_FILES := $(call all-subdir-java-files)
# Any libraries that this library depends on
LOCAL_JAVA_LIBRARIES := android.test.runner
# The name of the jar file to create
LOCAL_MODULE := sample
# Build a static jar file.
include $(BUILD_STATIC_JAVA_LIBRARY)
(10)Android.mk的編譯模塊中間可以定義相關的編譯內容，也就是指定相關的變數如下：
LOCAL_AAPT_FLAGS
LOCAL_ACP_UNAVAILABLE
LOCAL_ADDITIONAL_JAVA_DIR
LOCAL_AIDL_INCLUDES
LOCAL_ALLOW_UNDEFINED_SYMBOLS
LOCAL_ARM_MODE
LOCAL_ASFLAGS
LOCAL_ASSET_DIR
LOCAL_ASSET_FILES 在Android.mk文件中編譯應用程序(BUILD_PACKAGE)時設置此變數，表示資源文件，
通常會定義成LOCAL_ASSET_FILES += $(call find-subdir-assets)
LOCAL_BUILT_MODULE_STEM
LOCAL_C_INCLUDES 額外的C/C++編譯頭文件路徑，用LOCAL_PATH表示本文件所在目錄
舉例如下：
LOCAL_C_INCLUDES += extlibs/zlib-1.2.3
LOCAL_C_INCLUDES += $(LOCAL_PATH)/src
LOCAL_CC 指定C編譯器
LOCAL_CERTIFICATE 簽名認證
LOCAL_CFLAGS 為C/C++編譯器定義額外的標志(如宏定義)，舉例：LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1
LOCAL_CLASSPATH
LOCAL_COMPRESS_MODULE_SYMBOLS
LOCAL_COPY_HEADERS install應用程序時需要復制的頭文件，必須同時定義LOCAL_COPY_HEADERS_TO
LOCAL_COPY_HEADERS_TO install應用程序時復制頭文件的目的路徑
LOCAL_CPP_EXTENSION 如果你的C++文件不是以cpp為文件後綴，你可以通過LOCAL_CPP_EXTENSION指定C++文件後綴名
如：LOCAL_CPP_EXTENSION := .cc
注意統一模塊中C++文件後綴必須保持一致。
LOCAL_CPPFLAGS 傳遞額外的標志給C++編譯器，如：LOCAL_CPPFLAGS += -ffriend-injection
LOCAL_CXX 指定C++編譯器
LOCAL_DX_FLAGS
LOCAL_EXPORT_PACKAGE_RESOURCES
LOCAL_FORCE_STATIC_EXECUTABLE 如果編譯的可執行程序要進行靜態鏈接(執行時不依賴於任何動態庫)，則設置LOCAL_FORCE_STATIC_EXECUTABLE:=true
目前只有libc有靜態庫形式，這個只有文件系統中/sbin目錄下的應用程序會用到，這個目錄下的應用程序在運行時通常
文件系統的其它部分還沒有載入，所以必須進行靜態鏈接。
LOCAL_GENERATED_SOURCES
LOCAL_INSTRUMENTATION_FOR
LOCAL_INSTRUMENTATION_FOR_PACKAGE_NAME
LOCAL_INTERMEDIATE_SOURCES
LOCAL_INTERMEDIATE_TARGETS
LOCAL_IS_HOST_MODULE
LOCAL_JAR_MANIFEST
LOCAL_JARJAR_RULES
LOCAL_JAVA_LIBRARIES 編譯java應用程序和庫的時候指定包含的java類庫，目前有core和framework兩種
多數情況下定義成：LOCAL_JAVA_LIBRARIES := core framework
注意LOCAL_JAVA_LIBRARIES不是必須的，而且編譯APK時不允許定義(系統會自動添加)
LOCAL_JAVA_RESOURCE_DIRS
LOCAL_JAVA_RESOURCE_FILES
LOCAL_JNI_SHARED_LIBRARIES
LOCAL_LDFLAGS 傳遞額外的參數給連接器(務必注意參數的順序)
LOCAL_LDLIBS 為可執行程序或者庫的編譯指定額外的庫，指定庫以"-lxxx"格式，舉例：
LOCAL_LDLIBS += -lcurses -lpthread
LOCAL_LDLIBS += -Wl,-z,origin
LOCAL_MODULE 生成的模塊的名稱(注意應用程序名稱用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)
LOCAL_MODULE_PATH 生成模塊的路徑
LOCAL_MODULE_STEM
LOCAL_MODULE_TAGS 生成模塊的標記
LOCAL_NO_DEFAULT_COMPILER_FLAGS
LOCAL_NO_EMMA_COMPILE
LOCAL_NO_EMMA_INSTRUMENT
LOCAL_NO_STANDARD_LIBRARIES
LOCAL_OVERRIDES_PACKAGES
LOCAL_PACKAGE_NAME APK應用程序的名稱
LOCAL_POST_PROCESS_COMMAND
LOCAL_PREBUILT_EXECUTABLES 預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用,指定需要復制的可執行文件
LOCAL_PREBUILT_JAVA_LIBRARIES
LOCAL_PREBUILT_LIBS 預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用, 指定需要復制的庫.
LOCAL_PREBUILT_OBJ_FILES
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES
LOCAL_PRELINK_MODULE 是否需要預連接處理(默認需要，用來做動態庫優化)
LOCAL_REQUIRED_MODULES 指定模塊運行所依賴的模塊(模塊安裝時將會同步安裝它所依賴的模塊)
LOCAL_RESOURCE_DIR
LOCAL_SDK_VERSION
LOCAL_SHARED_LIBRARIES 可鏈接動態庫
LOCAL_SRC_FILES 編譯源文件
LOCAL_STATIC_JAVA_LIBRARIES
LOCAL_STATIC_LIBRARIES 可鏈接靜態庫
LOCAL_UNINSTALLABLE_MODULE
LOCAL_UNSTRIPPED_PATH
LOCAL_WHOLE_STATIC_LIBRARIES 指定模塊所需要載入的完整靜態庫(這些精通庫在鏈接是不允許鏈接器刪除其中無用的代碼)
LOCAL_YACCFLAGS
OVERRIDE_BUILT_MODULE_PATH
⑵ 請問安卓的SO文件是怎麼回事，可以反編譯出源碼嗎 是如何生成的用JAVA還是C代碼生成的
如何JAVA代碼調用?
jni吧？
安卓的SO文件是linux下的文件，用c或者c++寫的。
⑶ android studio JNI開發時 編譯成功 但是沒有生成.so文件 什麼原因
1
在交叉編譯的時候怎麼都無法生成so文件，javah生成頭文件沒錯，c文件也沒錯，java文件也沒錯，
2.原因：是JNI文件夾路徑不對
3
在執行javah命令時，我進入的是cd
app/src/main/java
這樣jni文件夾在java文件夾下，作為一個包存在，這樣就無法生成so文件
執行javah的正確姿勢：
4
進入app/src/main目錄：cd
app/src/main
執行javah命令：javah
javah
-d
jni
-classpath
./Java
lab.sodino.jnitest.MainActivity
5，
-d
jni
頭文件生成到jni文件夾（當前在<Project>\app\src\main目錄下，所以.h所在的目錄為<Project>\app\src\main\jni
）
-classpath
./java
指定去當前路徑下java下尋找包名指定的類
這樣再rebuild一下，就會生成so文件了