玩转Android10源码开发定制(八)内置Apk到系统
1.Android.mk文件说明
Android.mk是Android提供的一个makefile文件，可以将源文件分组为模块。用来引用的头文件目录、需要编译的*.c/*.cpp文件、jni源文件、指定编译生成*.so共享库文件或者*.a静态库文件，可以定义一个或多个模块，也可以多个模块中使用同一个源文件。
为方便模块编译，编译系统设置了很多模块描述环境变量和宏定义，如下列举一些常用的。
模块描述环境变量:
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LOCAL_SRC_FILES：
当前模块包含的源文件；
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LOCAL_MODULE：
当前模块的名称；
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LOCAL_PACKAGE_NAME
当前APK应用的名称；
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LOCAL_C_INCLUDES：
C/C++所需的头文件路径;
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LOCAL_STATIC_LIBRARIES：
当前模块在静态链接时需要的静态链接库名;
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LOCAL_SHARED_LIBRARIES：
当前模块在运行时依赖的动态链接库名;
-
LOCAL_STATIC_JAVA_LIBRARIES：
当前模块依赖的Java静态库;
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LOCAL_JAVA_LIBRARIES：
当前模块依赖的Java共享库;
-
LOCAL_CERTIFICATE：
当前应用的签名方式，比如使用系统签名platform。
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LOCAL_MODULE_TAGS：
表示该模块编译的标识，可能值为eng,user,tests或optional（默认值）。值具体表示:
user:指该模块只在user版本下才编译
eng:指该模块只在eng版本下才编译
tests:指该模块只在tests版本下才编译
optional:指该模块在所有版本下都编译
定义的 include 变量:
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include $(BUILD_SHARED_LIBRARY)
表示需要编译为so动态链接库。
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include $(BUILD_JAVA_LIBRARY)
表示需要编译为java动态库。
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include $(BUILD_JAVA_STATIC_LIBRARY)
表示需要编译为java静态库。
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include $(BUILD_STATIC_LIBRARY )
表示需要编译为so静态库。
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include $(BUILD_EXECUTABLE)
表示编译为Native C可执行程序
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include $(BUILD_PREBUILT)
表示源文件已经是编译好的，只需要进行复制操作
定义的函数宏，原型为 $(call ，以下列举几个:
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$(call my-dir)
获取当前文件夹路径；
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$(call all-java-files-under, )
获取指定目录下的所有Java文件；
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$(call all-c-files-under,)
获取指定目录下的所有C文件；
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$(call all-Iaidl-files-under, )
获取指定目录下的所有AIDL文件；
2.提供几个Android.mk模板
#编译so静态库LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE = libtestLOCAL_SRC_FILES = testxxx.cLOCAL_C_INCLUDES = $(INCLUDES)LOCAL_SHARED_LIBRARIES := libcutilsinclude $(BUILD_STATIC_LIBRARY)#编译为so动态库链接库LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE = libtestLOCAL_SRC_FILES = testxx.cLOCAL_C_INCLUDES = $(INCLUDES)LOCAL_SHARED_LIBRARIES := libcutilsinclude $(BUILD_SHARED_LIBRARY)#编译java动态库LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_MODULE := testjarinclude $(BUILD_JAVA_LIBRARY)#编译java静态库LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_MODULE := testjarinclude $(BUILD_STATIC_JAVA_LIBRARY)#编译为可执行文件LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := hellosLOCAL_STATIC_LIBRARIES := libhellosLOCAL_SHARED_LIBRARIES :=LOCAL_LDLIBS += -ldlLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := mains.cLOCAL_C_INCLUDES := $(INCLUDES)include $(BUILD_EXECUTABLE)#使用动态库LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := hellodLOCAL_MODULE_TAGS := debugLOCAL_SHARED_LIBRARIES := libc libcutils libhellodLOCAL_LDLIBS += -ldlLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := maind.cLOCAL_C_INCLUDES := $(INCLUDES)include $(BUILD_EXECUTABLE)#预编so动态链接库到指定目录LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := libtest.soLOCAL_MODULE_CLASS := SHARED_LIBRARIESLOCAL_MODULE_PATH := $(ANDROID_OUT_SHARED_LIBRARIES)LOCAL_SRC_FILES := lib/$(LOCAL_MODULE )OVERRIDE_BUILD_MODULE_PATH := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)include $(BUILD_PREBUILT)#预编二进制文件到系统include $(CLEAR_VARS)LOCAL_MODULE := testbinLOCAL_SRC_FILES := testbinLOCAL_MODULE_CLASS := EXECUTABLESLOCAL_MODULE_TAGS := optionalinclude $(BUILD_PREBUILT)# 内置Apk文件到系统LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := adbinputmethodLOCAL_MODULE_CLASS := APPSLOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)LOCAL_MODULE_TAGS := optionalLOCAL_PRIVILEGED_MODULE := trueLOCAL_BUILT_MODULE_STEM := package.apkLOCAL_SRC_FILES := $(LOCAL_MODULE).apk# LOCAL_CERTIFICATE := platformLOCAL_CERTIFICATE := PRESIGNEDinclude $(BUILD_PREBUILT)
3.源码中内置apk到系统
此处以内置搜狗输入法到系统为例说明。
(1). 创建存放内置App的目录，此处我创建为packages/myapps/sougou,如下所示:
qiang@ubuntu:~/lineageOs$ pwd/home/qiang/lineageOsqiang@ubuntu:~/lineageOs$ mkdir -p packages/myapps/sougouqiang@ubuntu:~/lineageOs$
(2).将搜狗输入法apk复制到packages/myapps/sougou,并创建内置apk到系统的Android.mk。如下所示：
qiang@ubuntu:~/lineageOs/packages/myapps/sougou$ pwd/home/qiang/lineageOs/packages/myapps/sougouqiang@ubuntu:~/lineageOs/packages/myapps/sougou$ ls -latotal 58480drwxrwxrwx 2 qiang qiang 4096 1月 1 18:22 .drwxrwxr-x 3 qiang qiang 4096 1月 2 02:25 ..-rwxrw-rw- 1 qiang qiang 755 1月 1 18:29 Android.mk-rwxrw-rw- 1 qiang qiang 59870272 11月 3 07:35 sougou.apk
对应的Android.mk内容为:
# ///ADD START# ///ADD END# 设置当前工作路径LOCAL_PATH:= $(call my-dir)# 清除变量值include $(CLEAR_VARS)# 生成的模块名称LOCAL_MODULE := sougou# 生成的模块类型LOCAL_MODULE_CLASS := APPS# 生成的模块后缀名,此处为apkLOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)# 设置模块tag，tags取值可以为:user debug eng tests optional# optional表示全平台编译LOCAL_MODULE_TAGS := optional# LOCAL_PRIVILEGED_MODULE := trueLOCAL_BUILT_MODULE_STEM := package.apk# 设置源文件LOCAL_SRC_FILES := $(LOCAL_MODULE).apk# LOCAL_CERTIFICATE := platform# 设置签名，此处表示保持apk原有签名LOCAL_CERTIFICATE := PRESIGNED# 此处表示预编译方式include $(BUILD_PREBUILT)
(3)将创建的搜狗输入法编译模块配置到编译系统，这个非常重要,如果不加入编译镜像默认是不会编译刚添加的模块。lineageOs中，可以在如下路径中添加Settings模块的地方追加sougou。
文件位置:
build/make/target/product/handheld_product.mk添加sougou内容之后的部分内容如下:
PRODUCT_PACKAGES += \Browser2 \Calendar \Camera2 \Contacts \DeskClock \Gallery2 \Launcher3QuickStep \Music \OneTimeInitializer \Provision \QuickSearchBox \Settings \SettingsIntelligence \StorageManager \SystemUI \WallpaperCropper \frameworks-base-overlays \sougou
（4）编译刷机
qiang@ubuntu:~/lineageOs/build/make/target/product$ crootqiang@ubuntu:~/lineageOs$ breakfast oneplus3Looking for dependencies in device/oneplus/oneplus3Looking for dependencies in device/oppo/commondevice/oppo/common has no additional dependencies.Looking for dependencies in kernel/oneplus/msm8996kernel/oneplus/msm8996 has no additional dependencies.============================================PLATFORM_VERSION_CODENAME=RELPLATFORM_VERSION=10LINEAGE_VERSION=17.1-20210102-UNOFFICIAL-oneplus3TARGET_PRODUCT=lineage_oneplus3TARGET_BUILD_VARIANT=userdebugTARGET_BUILD_TYPE=releaseTARGET_ARCH=arm64TARGET_ARCH_VARIANT=armv8-aTARGET_CPU_VARIANT=kryoTARGET_2ND_ARCH=armTARGET_2ND_ARCH_VARIANT=armv8-aTARGET_2ND_CPU_VARIANT=kryoHOST_ARCH=x86_64HOST_2ND_ARCH=x86HOST_OS=linuxHOST_OS_EXTRA=Linux-5.4.0-58-generic-x86_64-Ubuntu-20.04.1-LTSHOST_CROSS_OS=windowsHOST_CROSS_ARCH=x86HOST_CROSS_2ND_ARCH=x86_64HOST_BUILD_TYPE=releaseBUILD_ID=QQ3A.200805.001OUT_DIR=outPRODUCT_SOONG_NAMESPACES=vendor/oneplus/oneplus3 device/oneplus/oneplus3 vendor/nxp/opensource/pn5xx hardware/qcom-caf/msm8996============================================qiang@ubuntu:~/lineageOs$ brunch oneplus3Looking for dependencies in device/oneplus/oneplus3Looking for dependencies in device/oppo/commondevice/oppo/common has no additional dependencies.Looking for dependencies in kernel/oneplus/msm8996kernel/oneplus/msm8996 has no additional dependencies.
4.效果展示
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