About android mk parameters

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LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES

LOCAL_PREBUILT_LIBS

LOCAL_STATIC_JAVA_LIBRARIES

Android中可能会用到第三方的软件包，这包括Java包.jar和Native包.so。jar包既可通过Eclipse开发环境集成，也可通过编译源码集成，看你的工作环境。

假定自己开发的程序为MyMaps，需要用到BaiduMaps的库，包括baidumapapi.jar和libBMapApiEngine_v1_3_1.so。

一、Eclipse中集成第三方jar包及.so动态库

MyMaps工程下创建目录libs以及libs/armeabi，把baidumapapi.jar放在的libs/目录下，把libBMapApiEngine_v1_3_1.so放在libs/armeabi/下。

Eclipse中把第三方jar包baidumapapi.jar打包到MyMaps的步骤：

1. 右击工程，选择Properties；

2. JavaBuild Path，选择Libraries；

3. Libraries页面点击右面按钮“Add Library…”；

4. 选择“User Library”，点击“Next”；

5. 点击“User Libraries”按钮；

6. 在弹出界面中，点击“New…”；

7. 输入“User library name”，点击“OK”确认；

8. 返回之后，选择刚刚创建的User library，右面点击“AddJARs”；

9. 选择MyMaps/libs/下的baidumapapi.jar；

10. 确认，返回。

这样，编译之后，该jar包就会被打进MyMaps.apk中，libBMapApiEngine_v1_3_1.so也被打包在lib/armeabi/中。

程序运行过程中，libBMapApiEngine_v1_3_1.so被放在/data/data/<yourAppPackage>/lib/下，加载动态库时系统会从程序的该lib/目录下查找.so库。

二、源码中集成第三方集成jar包及.so动态库

Android源码中MyMaps放在packages/apps下。

MyMaps下创建目录libs以及libs/armeabi，并把baidumapapi.jar放在libs/，把libBMapApiEngine_v1_3_1.so放在libs/armeabi。

2.1 修改Android.mk文件

Android.mk文件如下：

1. LOCAL_PATH:= $(call my-dir)

2. include $(CLEAR_VARS)

4. LOCAL_MODULE_TAGS := optional

6. LOCAL_STATIC_JAVA_LIBRARIES := libbaidumapapi

8. LOCAL_SRC_FILES := $(call all-subdir-java-files)

10. LOCAL_PACKAGE_NAME := MyMaps

12. include $(BUILD_PACKAGE)

13.

14. ##################################################

15. include $(CLEAR_VARS)

17. LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES :=libbaidumapapi:libs/baidumapapi.jar

18. LOCAL_PREBUILT_LIBS :=libBMapApiEngine_v1_3_1:libs/armeabi/libBMapApiEngine_v1_3_1.so

19. LOCAL_MODULE_TAGS := optional

20. include $(BUILD_MULTI_PREBUILT)

21.

22. # Use the following include to make our testapk.

23. include $(callall-makefiles-under,$(LOCAL_PATH))

1 集成jar包

LOCAL_STATIC_JAVA_LIBRARIES 取jar库的别名，可以任意取值；

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES指定prebuiltjar库的规则，格式：别名:jar文件路径。注意：别名一定要与LOCAL_STATIC_JAVA_LIBRARIES 里所取的别名一致，且不含.jar；jar文件路径一定要是真实的存放第三方jar包的路径。

编译用BUILD_MULTI_PREBUILT

2 集成.so动态库

LOCAL_PREBUILT_LIBS指定prebuilt so的规则，格式：别名:so文件路径。注意：别名一般不可改变，特别是第三方jar包使用.so库的情况，且不含.so；so文件路径一定要是真实的存放第三方so文件的路径。

编译拷贝用BUILD_MULTI_PREBUILT。

2.2 加入到GRANDFATHERED_USER_MODULES

在文件user_tags.mk中，把libBMapApiEngine_v1_3_1加入到GRANDFATHERED_USER_MODULES中

1. GRANDFATHERED_USER_MODULES += \

2. … \

3. libBMapApiEngine_v1_3_1

user_tags.mk可以是build/core下的，也可以是$(TARGET_DEVICE_DIR)下的，推荐修改$(TARGET_DEVICE_DIR)下的。

2.3 编译结果

MyMaps.apk编译生成在out/target/product/<YourProduct>/system/app/下；

libBMapApiEngine_v1_3_1.so放在out/target/product/<YourProduct>/system/lib/下，这也是系统加载动态库时搜索的路径。

附上自己写的android.mk文件一个

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_STATIC_JAVA_LIBRARIES := lib3party

LOCAL_SRC_FILES := $(call all-subdir-java-files

LOCAL_PACKAGE_NAME := OnlineDownload

include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES :=lib3party:libs/android-support-v4.jar

include $(BUILD_MULTI_PREBUILT)

当需要加载多个jar包时，只需要按照mk文件规则，在定义变量的地方先空格，然后输入”\”符号，然后回车，然后输入jar包别名就行，附上编译通过的自己写的导入多个jar包的mk文件

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_STATIC_JAVA_LIBRARIES := libname1 \

libname2 \

libname3

LOCAL_SRC_FILES := $(callall-subdir-java-files)

LOCAL_PACKAGE_NAME := OnlineDownload

include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES :=libname1:libs/android-support-v4.jar \

libname2:libs/commons-net-1.2.2.jar \

libname3:libs/jakarta-oro-2.0.8.jar

include $(BUILD_MULTI_PREBUILT)

LOCAL_MODULE_CLASS and LOCAL_MODULE_PATH

3include $(CLEAR_VARS)4LOCAL_MODULE           := receiver_filter_policy.xml5LOCAL_MODULE_TAGS      := optional6LOCAL_MODULE_CLASS     := ETC7LOCAL_MODULE_PATH      := $(TARGET_OUT_ETC)8LOCAL_SRC_FILES        := $(LOCAL_MODULE)9include $(BUILD_PREBUILT)

./product/flounder32/obj/ETC/receiver_filter_policy.xml_intermediates
./product/flounder32/obj/ETC/receiver_filter_policy.xml_intermediates/receiver_filter_policy.xml
./product/flounder32/system/etc/receiver_filter_policy.xml

5include $(CLEAR_VARS)6LOCAL_MODULE := appops7LOCAL_SRC_FILES := appops8LOCAL_MODULE_CLASS := EXECUTABLES9LOCAL_MODULE_TAGS := optional10include $(BUILD_PREBUILT)

./product/flounder32/obj/EXECUTABLES/appops_intermediates
./product/flounder32/obj/EXECUTABLES/appops_intermediates/appops
./product/flounder32/system/bin/appops

3include $(CLEAR_VARS)45LOCAL_MULTILIB := 326LOCAL_SRC_FILES_arm     := armeabi/libAlphaInputWrapper.so910LOCAL_MODULE := libAlphaInputWrapper11LOCAL_MODULE_CLASS := SHARED_LIBRARIES12LOCAL_MODULE_SUFFIX := .so13LOCAL_MODULE_TAGS := optional1415include $(BUILD_PREBUILT)./product/flounder32/obj/lib/libAlphaInputWrapper.so./product/flounder32/obj/SHARED_LIBRARIES/libAlphaInputWrapper_intermediates./product/flounder32/obj/SHARED_LIBRARIES/libAlphaInputWrapper_intermediates/LINKED/libAlphaInputWrapper.so./product/flounder32/obj/SHARED_LIBRARIES/libAlphaInputWrapper_intermediates/PACKED/libAlphaInputWrapper.so./product/flounder32/system/lib/libAlphaInputWrapper.so./product/flounder32/symbols/system/lib/libAlphaInputWrapper.so

In fireos/prebuilts/middleware/h2clientservice/prebuilts/apk/debug/Android.mk

3# the debug apps are only effective for eng build4ifneq (,$(filter debug,$(FIREOS_PREBUILT_INSTALL)))              if in userdebug build, continue56# enum all the .apk files immediately below current directory7debug_apps := $(notdir $(wildcard $(LOCAL_PATH)/*.apk))             search for apk file in current folder89# all the debug apps will be signed with the key specified by LOCAL_CERTIFICATE10# regardless of the original key signed the package with.11define _add_debug_apps12include $$(CLEAR_VARS)13LOCAL_MODULE        := $(basename $1)14LOCAL_SRC_FILES     := $115LOCAL_MODULE_TAGS   := optional16LOCAL_CERTIFICATE   := $(FIREOS_LOCAL_CERTIFICATE_OVERRIDE)17LOCAL_MODULE_SUFFIX := $$(COMMON_ANDROID_PACKAGE_SUFFIX)18LOCAL_MODULE_CLASS  := APPS19LOCAL_PRIVILEGED_MODULE := true20include $$(BUILD_PREBUILT)21endef2223$(foreach _apk, $(debug_apps), \24    $(eval $(call _add_debug_apps,$(_apk))))           For each apk file, call _add_debug_apps function, the parameter is the apk path.2526local_install_packages += $(basename $(debug_apps))2728debug_apps :=2930endif # ifneq (,$(filter debug,$(FIREOS_PREBUILT_INSTALL)))./product/flounder32/obj/APPS/com.amazon.h2clientservice_intermediates./product/flounder32/system/priv-app/com.amazon.h2clientservice./product/flounder32/system/priv-app/com.amazon.h2clientservice/com.amazon.h2clientservice.apkIn fireos/prebuilts/middleware/h2clientservice/prebuilts/jar/Android.mk19_non_dexed_jar_files := com.amazon.h2contracts.jar2122# static jar files must be added manually23_static_jar_files :=2425# generate install jar file list26_install_jar_files := $(filter-out $(_static_jar_files),$(_non_dexed_jar_files))272829ifneq ($(strip $(SHOW_COMMANDS)),)30$(info _non_dexed_jar_files=$(_non_dexed_jar_files))31$(info _static_jar_files=$(_static_jar_files))32$(info _install_jar_files=$(_install_jar_files))33endif343536include $(CLEAR_VARS)37LOCAL_PREBUILT_JAVA_LIBRARIES           := $(_install_jar_files)38LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES    := $(_static_jar_files)39include $(BUILD_MULTI_NONDEX_JAVA_LIBRARIES)4041local_install_packages += $(basename $(_install_jar_files))

 ./product/flounder32/obj/JAVA_LIBRARIES/com.amazon.h2contracts_intermediates
./product/flounder32/system/framework/com.amazon.h2contracts.jar
./common/obj/JAVA_LIBRARIES/com.amazon.h2contracts_intermediates    As the jar file may be used by other components, so generate intermediates file for future usage.

In fireos/prebuilts/system/apks/debug/com.amazon.dp.contacts/Android.mk

9LOCAL_MODULE_TAGS         := optional17LOCAL_MODULE              := com.amazon.dp.contacts20LOCAL_CERTIFICATE := $(FIREOS_LOCAL_CERTIFICATE_OVERRIDE)2126LOCAL_MODULE_CLASS        := APPS27LOCAL_MODULE_SUFFIX       := $(COMMON_ANDROID_PACKAGE_SUFFIX)28LOCAL_PRIVILEGED_MODULE := true39include $(BUILD_PREBUILT)

./product/flounder32/obj/APPS/com.amazon.dp.contacts_intermediates
./product/flounder32/system/priv-app/com.amazon.dp.contacts
./product/flounder32/system/priv-app/com.amazon.dp.contacts/com.amazon.dp.contacts.apk


In In fireos/packages/apps/Precog/Android.mk
8LOCAL_MODULE       := precog-api9LOCAL_MODULE_TAGS  := optional10LOCAL_MODULE_CLASS := JAVA_LIBRARIES11LOCAL_JAVA_LIBRARIES := fireos.sdk.annotations1213LOCAL_SRC_FILES := \14src/main/java/com/amazon/precog/api/FeatureCallback.java \21include $(BUILD_JAVA_LIBRARY)
./product/flounder32/obj/JAVA_LIBRARIES/precog-api_intermediates
./product/flounder32/system/framework/precog-api.jar
./common/obj/JAVA_LIBRARIES/precog-api_intermediates


In In fireos/packages/apps/FrankDvrServer/test/Android.mk
1LOCAL_PATH:= $(call my-dir)2include $(CLEAR_VARS)34LOCAL_PACKAGE_NAME := FrankMediaServerTest5LOCAL_MODULE_TAGS := optional6LOCAL_CERTIFICATE := platform7LOCAL_PRIVILEGED_MODULE := true8LOCAL_PROGUARD_ENABLED := disabled9LOCAL_DEX_PREOPT := false1011LOCAL_SRC_FILES := $(call all-java-files-under, src)15include $(BUILD_PACKAGE)
./product/flounder32/obj/APPS/FrankMediaServerTest_intermediates
./product/flounder32/system/priv-app/FrankMediaServerTest/FrankMediaServerTest.apk
./common/obj/APPS/FrankMediaServerTest_intermediates

In frameworks/opt/vcard/Android.mk
16include $(CLEAR_VARS)19LOCAL_SDK_VERSION := 92021LOCAL_MODULE := com.android.vcard22LOCAL_SRC_FILES := $(call all-java-files-under, java)2324include $(BUILD_STATIC_JAVA_LIBRARY)

./common/obj/JAVA_LIBRARIES/com.android.vcard_intermediates

WITH_DEXPREOPT

所有的 apk 内包含一个 classes.dex 文件。

在 Dalvik上，apk包里的 dex文件在安装的时候会通过 dexopt 转化成另一个格式，叫odex（Opitimized dex），然后存在 /data/dalvik-cache里面，如：
　　/data/dalvik-cache/data@app@com.wochacha-1.apk@classes.dex
虽然文件后缀还是 .dex，但是这个dex和apk内的那个已经不一样了。这个文件是针对当前机器的硬件对 dex 文件进行了定制化，也就是说把这个放到别的设备上，不一定能运行。

PS: 在要编译 rom 的时候，如果参数加上 "WITH_DEXPREOPT=true"，会在 /system/app/ 下同时生成 .apk 和 .odex 文件（注意，这里后缀又用的 .odex，但实际上和系统在 /data/dalvik-cache/ 下的 .dex文件是一样的）

在 ART上，apk 包里的 dex文件在安装的时候通过 dex2oat，也会生成一个后缀为 .dex 的文件，放在 /data/dalvik-cache中，如：
　　/data/dalvik-cache/arm/system@app@Bluetooth@Bluetooth.apk@classes.dex
　　/data/dalvik-cache/arm64/system@vendor@app@ims@ims.apk@classes.dex
这个文件后缀叫 .dex ，但是这个文件又不一样了，这个既不是 dex 也不是 odex，用 dex2jar 的无法进行反编译的。文件格式也完全不同，因为这其实就是一个实打实的 elf文件，这个文件已经可以直接在机器上运行了。

WITH_DEXPREOPT使能编译时生成 OAT，避免第一次开机时编译耗时，但会增大 system分区的空间消耗

DONT_DEXPREOPT_PREBUILTS

　　使能后，将不会对 Android.mk中包含了 include $(BUILD_PREBUILT)的 Apk进行 oat，例如 Gmail，它很可能会在后期通过商店自行升级，而升级后系统中的 oat文件则没有意义了，但又无法删除，会造成空间的浪费（oat比dex文件要大）

WITH_DEXPREOPT_BOOT_IMG_ONLY

　　仅仅针对 boot.img进行oat优化（boot.img中包含 boot.art和 boot.oat）

LOCAL_DEX_PREOPT (from DEX_PREOPT_DEFAULT)

value : ture | false | nostripping

　　可用于各个 Android.mk，对每个 package进行单独配置，当设置为 true时，dex文件将会从 apk中剔除，如果不想剔除可使用 nostripping.

PRODUCT_DEX_PREOPT_BOOT_FLAGS

　　这里的参数将会传至 dex2oat，控制 boot.img的编译优化行为。

PRODUCT_DEX_PREOPT_DEFAULT_FLAGS

　　控制除 boot.img 外，其他（如 jar, apk）的 OAT编译行为例如：

　　PRODUCT_DEX_PREOPT_DEFAULT_FLAGS := --compiler-filter=interpret-only
　　$(call add-product-dex-preopt-module-config,services,--compiler-filter=space)

WITH_DEXPREOPT_PIC

ture|false

使能 position-independent code，这样在dex2oat编译生成的 odex文件在运行时将不必再从 /system 下拷贝到 /data/dalvik-cache/ 目录下，可以节省 /data 空间

WITH_ART_SMALL_MODE

true|false

　　设置为 true 时，将只编译处于 boot classpath 里的类，其他的均不编译，这样既能加快第一次开机时间，因为大部分必要的类已经编译过了；同时也能节省不少空间，因为 APP 都未进行编译。缺点是可能损失一性能，这可能要平时觉察不出，但在跑分软件上会有所体现

编译选项的经典配置

　　为了提高第一次开机速度，WITH_DEXPREOPT是必须使能的，这样则在编译阶段会完成 dex2oat的操作，避免在开机时间去做这个转码，节省了开机时间（6min以上缩短2min内）。

　　但会引起一个缺点，那就是 apk中还是包含了class.dex（dexopt生成的），同时在对应的apk文件夹中又生成了已经转码成oat的 class.odex（dex2oat生成的），相当于这部分重复，造成了大量的空间浪费。

　　为了把 apk包里的 class.dex去除，节省空间，可以打开 DEX PREOPT DEFAULT := ture。

　　然而，这样开机速度是快了，而且节省了不少system空间，但开机后，我们会发现即使在 system中已经存在 class.odex的 apk，第一次开机后还是会在 /data下面生成 class.odex，如data/dalvik-cache/arm64/system@app@Music@Music.apk@classes.dex，这是何解？原来 Google为了提高安全性，在每一台机器开机时都会在之前的机器码加一个随机的偏移量，这个偏移量是随机的，每台机器都不相同，而 data分区下的这些文件就是从 system下的 class.odex加上偏移而来。

A ref: Android预优化那些事

Our preopt solution

We define a variable USE_FIREOS_DEFAULT_DEXPREOPT. User can set it to "true, false, userdata, cache". If not set, we set the value according to the environment.

367ifeq ($(HOST_OS),linux)368  ifeq ($(TARGET_BUILD_VARIANT),user)369    # Use the default dexpreopt parameters for user builds.370    # Not all devices have sufficient space in system for this371    # configuration to work on other variants. They will either372    # not dexpreopt at all (like stock AOSP), or make some compromises373    # to get some benefit from dexpreopt.374    USE_FIREOS_DEFAULT_DEXPREOPT ?= userdata375  else  # ! ifeq ($(TARGET_BUILD_VARIANT),user)376  ifeq ($(TARGET_BUILD_VARIANT),userdebug)377    USE_FIREOS_DEFAULT_DEXPREOPT ?= userdata378  endif # ifeq ($(TARGET_BUILD_VARIANT),userdebug)379  endif # ifeq ($(TARGET_BUILD_VARIANT),user)380endif # ($(HOST_OS),linux)381382# Devices that need a minimal dexpreopt configuration, with only boot.art383# and boot.oat installed in the system partition should also change the384# default value of DEX_PREOPT_DEFAULT, typically:385# DEX_PREOPT_DEFAULT := $(USE_FIREOS_DEFAULT_DEXPREOPT)386# This will cause non-BOOTCLASSPATH jars and platform applications to387# get compiled to userdata/cache instead of system. The default value is388# purposely not overridden here because keeping as much precompiled code389# in system as possible is optimal for overall storage efficiency and for390# boot time after system OTA and factory reset.391392# Preserve documented AOSP behavior: if WITH_DEXPREOPT is false, we don't393# want to enable any special FireOS dexpreopt behavior.394ifeq ($(WITH_DEXPREOPT),false)395  USE_FIREOS_DEFAULT_DEXPREOPT :=396  DONT_DEXPREOPT_PREBUILTS := true397  DEXPREOPT_PREBUILTS_INSTALL := false             this will be used as default value for LOCAL_DEX_PREOPT398endif399400ifneq ($(USE_FIREOS_DEFAULT_DEXPREOPT),)401  # shared settings for all FireOS dexpreopt modes402  ifeq ($(filter-out userdata cache,$(USE_FIREOS_DEFAULT_DEXPREOPT)),)         if $(USE_FIREOS_DEFAULT_DEXPREOPT) contain userdata or cache403    WITH_DEXPREOPT := true404    # Use this file to indicate that this is a fresh flash.405    FACTORY_PREOPT_FLAG_FILE := FACTORY_PREOPT406    # Don't precompile files matching these patterns in407    # LOCAL_MODULE_PATH.408    # Note: do not use := here - this must be expanded at use409    # in order for PRODUCT_OUT to expand correctly.410    NEVER_DEXPREOPT_DIRS = $(PRODUCT_OUT)/mw_test_apps/%411    # We should dexpreopt prebuilts unless explicitly overridden412    DONT_DEXPREOPT_PREBUILTS ?= false413  endif # ifeq ($(filter-out true userdata cache,$(USE_FIREOS_DEFAULT_DEXPREOPT)),)414415  ifeq ($(filter-out userdata,$(USE_FIREOS_DEFAULT_DEXPREOPT)),)     if $(USE_FIREOS_DEFAULT_DEXPREOPT) only contain userdata416    # Install pre-compiled prebuilts to userdata.417    DEXPREOPT_PREBUILTS_INSTALL := userdata418    # Unsetting this should compile out run-time entry points for419    # dalvik-cache in cache.420    TARGET_DEXOPT_CACHEFS_SPACE_RESERVE :=421  else  # ! ifeq ($(filter-out userdata,$(USE_FIREOS_DEFAULT_DEXPREOPT)),)422  ifeq ($(USE_FIREOS_DEFAULT_DEXPREOPT),cache)     if $(USE_FIREOS_DEFAULT_DEXPREOPT) only contain cache423    # Install pre-compiled prebuilts to cache.424    DEXPREOPT_PREBUILTS_INSTALL := cache425    # Space reserved in the cache partition for system OTA use in kilobytes.426    # Dexopt should leave at least this much space free.427    TARGET_DEXOPT_CACHEFS_SPACE_RESERVE ?= 256000428  endif # ifeq ($(USE_FIREOS_DEFAULT_DEXPREOPT),cache)429  endif # ifeq ($(filter-out userdata,$(USE_FIREOS_DEFAULT_DEXPREOPT)),)430endif # ifneq ($(USE_FIREOS_DEFAULT_DEXPREOPT),)131# If we don't already have an explicit LOCAL_DEX_PREOPT, set the132# default from DEXPREOPT_PREBUILTS_INSTALL, if set.133ifeq ($(LOCAL_DEX_PREOPT),)134ifneq ($(DEXPREOPT_PREBUILTS_INSTALL),)135LOCAL_DEX_PREOPT := $(DEXPREOPT_PREBUILTS_INSTALL)136endif137endif

1354define build-userdataimage-target1355  $(call pretty,"Target userdata fs image: $(INSTALLED_USERDATAIMAGE_TARGET)")1356  @mkdir -p $(TARGET_OUT_DATA)1358  $(if $(DEXPREOPT_PREBUILTS_INSTALL),\1359    $(if $(filter-out cache userdata,$(DEXPREOPT_PREBUILTS_INSTALL)),,\1360      $(hide) mkdir -p $(TARGET_OUT_DATA)/dalvik-cache/$(TARGET_ARCH) && \1361      touch $(TARGET_OUT_DATA)/dalvik-cache/$(TARGET_ARCH)/$(FACTORY_PREOPT_FLAG_FILE) ; \1362      $(if $(TARGET_2ND_ARCH),\1363        mkdir -p $(TARGET_OUT_DATA)/dalvik-cache/$(TARGET_2ND_ARCH) && \1364        touch $(TARGET_OUT_DATA)/dalvik-cache/$(TARGET_2ND_ARCH)/$(FACTORY_PREOPT_FLAG_FILE) \1365      ) \1366    ) \1367  )........................1380endefLOCAL_DEX_PREOPT initialize
115# Disable dex-preopt of prebuilts to save space, if requested.116ifeq ($(DONT_DEXPREOPT_PREBUILTS),true)117LOCAL_DEX_PREOPT := false118endif119120ifneq ($(LOCAL_MODULE_PATH),)121ifneq ($(NEVER_DEXPREOPT_DIRS),)122# Test apps that are not pre-installed on the device are pointless to123# dexpreopt. There may be more cases that should be excluded, so use124# a general-purpose blacklist.125ifeq ($(filter-out $(NEVER_DEXPREOPT_DIRS),$(LOCAL_MODULE_PATH)),)        if the module path is in the exclusive app list, don't do preopt.126LOCAL_DEX_PREOPT := false127endif128endif129endif130131# If we don't already have an explicit LOCAL_DEX_PREOPT, set the132# default from DEXPREOPT_PREBUILTS_INSTALL, if set.133ifeq ($(LOCAL_DEX_PREOPT),)134ifneq ($(DEXPREOPT_PREBUILTS_INSTALL),)135LOCAL_DEX_PREOPT := $(DEXPREOPT_PREBUILTS_INSTALL)136endif137endif138139# Don't use cache space for apps that are installed on userdata if the140# default will generally write to cache.141ifneq ($(LOCAL_MODULE_PATH),)142ifeq ($(LOCAL_DEX_PREOPT)$(filter-out $(TARGET_OUT_DATA)/%,$(LOCAL_MODULE_PATH)), cache)143LOCAL_DEX_PREOPT := userdata144endif145endif

207#######################################208# defines built_odex along with rule to install odex209include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk210#######################################284ifeq ($(words $(PRODUCT_RUNTIMES)),1)285  # If we only have one runtime, we can strip classes.dex by default during dex_preopt286  DEX_PREOPT_DEFAULT := true287else288  # If we have more than one, we leave the classes.dex alone for post-boot analysis289  DEX_PREOPT_DEFAULT := nostripping290endif


In dex_preopt_odex_install.mk5# Setting LOCAL_DEX_PREOPT based on WITH_DEXPREOPT, LOCAL_DEX_PREOPT, etc6LOCAL_DEX_PREOPT := $(strip $(LOCAL_DEX_PREOPT))7ifneq (true,$(WITH_DEXPREOPT))   not do dexopt by default8  LOCAL_DEX_PREOPT :=9else # WITH_DEXPREOPT=true10  ifeq (,$(TARGET_BUILD_APPS)) # TARGET_BUILD_APPS empty11    ifndef LOCAL_DEX_PREOPT # LOCAL_DEX_PREOPT undefined12      ifneq ($(filter $(TARGET_OUT)/%,$(my_module_path)),) # Installed to system.img.13        ifeq (,$(LOCAL_APK_LIBRARIES)) # LOCAL_APK_LIBRARIES empty14          # If we have product-specific config for this module?15          ifeq (disable,$(DEXPREOPT.$(TARGET_PRODUCT).$(LOCAL_MODULE).CONFIG))16            LOCAL_DEX_PREOPT := false17          else18            LOCAL_DEX_PREOPT := $(DEX_PREOPT_DEFAULT)19          endif20        else # LOCAL_APK_LIBRARIES not empty21          LOCAL_DEX_PREOPT := nostripping22        endif # LOCAL_APK_LIBRARIES not empty23      endif # Installed to system.img.24    endif # LOCAL_DEX_PREOPT undefined25  endif # TARGET_BUILD_APPS empty26endif # WITH_DEXPREOPT=true27ifeq (false,$(LOCAL_DEX_PREOPT))28  LOCAL_DEX_PREOPT :=29endif30ifdef LOCAL_UNINSTALLABLE_MODULE31LOCAL_DEX_PREOPT :=32endif33ifeq (,$(strip $(built_dex)$(my_prebuilt_src_file))) # contains no java code34LOCAL_DEX_PREOPT :=35endif36# if module oat file requested in data, disable LOCAL_DEX_PREOPT, will default location to dalvik-cache37ifneq (,$(filter $(LOCAL_MODULE),$(PRODUCT_DEX_PREOPT_PACKAGES_IN_DATA)))38LOCAL_DEX_PREOPT :=39endif40# if WITH_DEXPREOPT_BOOT_IMG_ONLY=true and module is not in boot class path skip41ifeq (true,$(WITH_DEXPREOPT_BOOT_IMG_ONLY))42ifeq ($(filter $(DEXPREOPT_BOOT_JARS_MODULES),$(LOCAL_MODULE)),)43LOCAL_DEX_PREOPT :=44endif45endif50ifdef LOCAL_DEX_PREOPT51dexpreopt_boot_jar_module := $(filter $(DEXPREOPT_BOOT_JARS_MODULES),$(LOCAL_MODULE))52ifdef dexpreopt_boot_jar_module53ifeq ($(DALVIK_VM_LIB),libdvm.so)54built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex55installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex56built_installed_odex := $(built_odex):$(installed_odex)57else # libdvm.so58# For libart, the boot jars' odex files are replaced by $(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE).59# We use this installed_odex trick to get boot.art installed.60installed_odex := $(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE)61# Append the odex for the 2nd arch if we have one.62installed_odex += $($(TARGET_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE)63endif # libdvm.so64else  # boot jar65ifeq ($(DALVIK_VM_LIB),libdvm.so)66built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex67installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex68built_installed_odex := $(built_odex):$(installed_odex)6970$(built_odex) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT) \71                $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS)72else # libart74LOCAL_DEX2OAT_TARGET_ARCH := $(DEX2OAT_TARGET_ARCH)75$(TARGET_2ND_ARCH_VAR_PREFIX)LOCAL_DEX2OAT_TARGET_ARCH := $($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH)141ifeq ($(LOCAL_DEX_PREOPT),cache)142dexpreopt_install_root :=  $(TARGET_OUT_CACHE)/dalvik-cache/143else ifeq ($(LOCAL_DEX_PREOPT),userdata)144dexpreopt_install_root :=  $(TARGET_OUT_DATA)/dalvik-cache/145else146dexpreopt_install_root :=  $(dir $(LOCAL_INSTALLED_MODULE))147endif148149# Use pattern rule - we may have multiple installed odex files.150# Ugly syntax - See the definition get-odex-file-path.151$(installed_odex) : $(dexpreopt_install_root)%$(notdir $(word 1,$(installed_odex))) \152                  : $(dir $(LOCAL_BUILT_MODULE))%$(notdir $(word 1,$(built_odex))) \153    | $(ACP)154$(call print-install,$@) #fosmod_build_extensions oneline155$(copy-file-to-target)156endif159# Add the installed_odex to the list of installed files for this module.160ALL_MODULES.$(my_register_name).INSTALLED += $(installed_odex)161ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(built_installed_odex)162163# Make sure to install the .odex when you run "make <module_name>"164$(my_register_name): $(installed_odex)165166endif # LOCAL_DEX_PREOPT


220ifdef LOCAL_DEX_PREOPT222# dexpreopt to cache and userdata should not strip classes.dex223ifneq ($(filter-out nostripping cache userdata,$(LOCAL_DEX_PREOPT)),)225$(call dexpreopt-remove-classes.dex,$@)226endif227endif228$(align-package)229230###############################231## Rule to build the odex file232ifdef LOCAL_DEX_PREOPT233$(built_odex) : $(my_prebuilt_src_file)234$(call dexpreopt-one-file,$<,$@)235endif

odex是从APK中提取出来的可运行文件，即将APK中的class.dex文件通过

dex优化过程将其优化生成odex文件单独存放。如果没有odex，系统需要在开机过程中从APK内提取dex再运行；如果在build过程中预先提取，可加快系统启动速度、节省开机时间。

一般情况下：

User 版本会预先提取有source code的APK的odex文件，因为有source code的APK在Android.mk中都会通过include $(BUILD_PACKAGE)来编译，会调用到package.mk来提取odex

但User版本不会预先提取通过prebuilt方式预置的APK的odex文件，因为采用prebuilt方式预置APK是只有APK文件而没有source code时，在Android.mk中通过 include $(BUILD_PREBUILT)预置APK，代码中原本的prebuilt.mk中不会提取odex。

方法：

实现prebuilt APK提取odex的修改方法如下：修改build/core/prebuilt.mk

1.文件最开始部分添加红色部分

ifneq (true,$(WITH_DEXPREOPT))

LOCAL_DEX_PREOPT :=

else

ifndef LOCAL_DEX_PREOPT

LOCAL_DEX_PREOPT := $(DEX_PREOPT_DEFAULT)

endif

ifeq (false,$(LOCAL_DEX_PREOPT))

LOCAL_DEX_PREOPT :=

endif

ifeq ($(filter APPS,$(LOCAL_MODULE_CLASS)),)

LOCAL_DEX_PREOPT :=

endif

$(info prebuild $(LOCAL_MODULE)==> $(LOCAL_DEX_PREOPT))

... ...

2.添加红色部分

... ...

ifdef LOCAL_IS_HOST_MODULE

my_prefix := HOST_

LOCAL_DEX_PREOPT :=

else

my_prefix := TARGET_

endif

... ...

3.添加红色部分

... ...

ifneq ($(filter APPS,$(LOCAL_MODULE_CLASS)),)

ifdef LOCAL_DEX_PREOPT

$(built_module): $(DEXPREOPT_BOOT_ODEXS) | $(DEXPREOPT) $(DEXOPT)

endif

ifeq ($(LOCAL_CERTIFICATE),PRESIGNED)

# Ensure that presigned .apks have been aligned.

$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN)

#$(transform-prebuilt-to-target-with-zipalign)

$(transform-prebuilt-to-target)

ifdef LOCAL_DEX_PREOPT

$(hide) rm -f $(patsubst %.apk,%.odex,$@)

$(call dexpreopt-one-file,$@,$(patsubst %.apk,%.odex,$@))

ifneq (nostripping,$(LOCAL_DEX_PREOPT))

$(call dexpreopt-remove-classes.dex,$@)

endif

$(align-package)

else

# Sign and align non-presigned .apks.

$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN) $(SIGNAPK_JAR)

$(transform-prebuilt-to-target)

$(sign-package)

ifdef LOCAL_DEX_PREOPT

$(hide) rm -f $(patsubst %.apk,%.odex,$@)

$(call dexpreopt-one-file,$@,$(patsubst %.apk,%.odex,$@))

ifneq (nostripping,$(LOCAL_DEX_PREOPT))

$(call dexpreopt-remove-classes.dex,$@)

endif

$(align-package)

endif

ifdef LOCAL_DEX_PREOPT

built_odex := $(basename $(built_module)).odex

$(built_odex): $(built_module)

endif

else

... ...

注意：

(1)user build默认开启dexopt功能，eng build关闭，所以只是build user版本会提取APK的odex文件。

(2)请务必不要忘记把预置的module添加到build/target/product/common.mk(或者[proj].mk)中的PRODUCT_PACKAGES里面。

(3)只有prebuilt预置APK时会生效，放置在vendor下拷贝的方式来预置APK是不会生效的。

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