Android.bp入门指南之Android.mk转换成Android.bp
16lz
2021-01-24
Android.bp入门指南之Android.mk转换成Android.bp
前言
在前面的篇章初识Android.bp和Android.bp入门指南之语法初识我们对Android.bp是啥和基本语法都有了一个初步层次的认识。Android的妈咪谷歌当然也考虑到了，从Android.mk切换到Android,mk需要一定的时间，从而为我们精心开发了一个工具androidmk，但是这个工具不是很完善，对于一些Android.mk中的宏开关就无从处理了。本篇今天就带领大伙认识一下androidmk工具的使用。
注意:本篇是以Android 9的工程来进行讲解的。
一 初探androidmk
1.1 androidmk的源码和位置
首先让我们从androidmk的框架和源码如下来说起，我们知道Android的最新编译系统的文件架构如下：
xxx@Ubuntu16-Model:~/ssd/qcom_64/msm8953-9$ ls -l buildtotal 16drwxr-xr-x 14 xxx pd 4096 Feb 17 14:18 blueprintlrwxrwxrwx 1 xxx pd 25 Feb 20 11:17 buildspec.mk.default -> make/buildspec.mk.defaultlrwxrwxrwx 1 xxx pd 17 Feb 20 11:17 CleanSpec.mk -> make/CleanSpec.mklrwxrwxrwx 1 xxx pd 9 Feb 20 11:17 core -> make/corelrwxrwxrwx 1 xxx pd 16 Feb 20 11:17 envsetup.sh -> make/envsetup.shdrwxr-xr-x 5 xxx pd 4096 Feb 17 14:18 katidrwxr-xr-x 6 xxx pd 4096 Feb 20 15:05 makedrwxr-xr-x 21 xxx pd 4096 Feb 20 15:08 soonglrwxrwxrwx 1 xxx pd 11 Feb 20 11:17 target -> make/targetlrwxrwxrwx 1 xxx pd 10 Feb 20 11:17 tools -> make/tools而我们的androidmk的源码目录位置如下：
xxx@Ubuntu16-Model:~/ssd/qcom_64/msm8953-9$ ls -l build/soong/androidmk/total 12-rw-r--r-- 1 xxx pd 1302 Feb 17 14:18 Android.bpdrwxr-xr-x 3 xxx pd 4096 Feb 17 14:18 cmddrwxr-xr-x 2 xxx pd 4096 Feb 17 14:18 parser编译Android源码以后，最好androidmk生成的位置如下：
xxx@Ubuntu16-Model:~/ssd/qcom_64/msm8953-9$ find . -name androidmk -type f./out/soong/host/linux-x86/bin/androidmk1.2 androidmk的用法
在前面的章节，我们降解了androidmk的源码位置和编译完成之后的执行文件的路径，在这个章节我们将要讲解androidmk的使用，如下：
xxx@Ubuntu16-Model:~/ssd/qcom_64/msm8953-9$ androidmk usage: androidmk [flags] <inputFile>androidmk parses <inputFile> as an Android.mk file and attempts to output an analogous Android.bp file (to standard out)xxx@Ubuntu16-Model:~/ssd/qcom_64/msm8953-9$用一句通俗的话来讲就是androidmk Android.mk > Android.bp
1.3 androidmk的实际使用
好了，前面说了这么多，都是为了实际运行，那么我们通过几个实例来看看androidmk究竟有啥魔力。
1.3.1 生成App
让我们先来看看生成App的Android.mk文件如下：
LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE_TAGS := optionalLOCAL_JAVA_LIBRARIES := servicesLOCAL_SRC_FILES := $(call all-java-files-under, src)LOCAL_SRC_FILES += \ src/android/bluetooth/IXxxBtPrinter.aidl \#LOCAL_SDK_VERSION := currentLOCAL_PRIVATE_PLATFORM_APIS := trueLOCAL_PACKAGE_NAME := XxxBtPrinter#LOCAL_PROGUARD_FLAG_FILES := proguard.flags#add this for generate and print barcodeLOCAL_STATIC_JAVA_LIBRARIES := zxing_apiLOCAL_DEX_PREOPT := falseLOCAL_CERTIFICATE := platforminclude $(BUILD_PACKAGE)# Use the folloing include to make our test apk.include $(call all-makefiles-under,$(LOCAL_PATH))include $(CLEAR_VARS)LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := zxing_api:libs/core_3.2.0.jarinclude $(BUILD_MULTI_PREBUILT)执行转换命令：
//注意生成的不一定要叫做Android.bp可以叫做其它的androidmk Android.mk > Android.bp让我们先来看看生成Android.bp内容如下：
android_app { libs: ["services"], srcs: ["src/**/*.java"] + ["src/android/bluetooth/IXxxBtPrinter.aidl"], //LOCAL_SDK_VERSION := current // ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_PRIVATE_PLATFORM_APIS // LOCAL_PRIVATE_PLATFORM_APIS := true name: "XxxBtPrinter", //LOCAL_PROGUARD_FLAG_FILES := proguard.flags //add this for generate and print barcode static_libs: ["zxing_api"], dex_preopt: { enabled: false, }, certificate: "platform",}// Use the folloing include to make our test apk.// ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES// LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := zxing_api:libs/core_3.2.0.jar// ANDROIDMK TRANSLATION ERROR: unsupported include// include $(BUILD_MULTI_PREBUILT)这里可以看到预编译的转换是没有成功的，所以androidmk还是有一些不是很智能的，需要手动去修改。
1.3.2 生成可执行文件
先让我们看看生成可执行文件的Android.mk的定义：
LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := nativetestLOCAL_SRC_FILES := apitest.cLOCAL_CFLAGS += -Wno-error=implicit-function-declarationLOCAL_SHARED_LIBRARIES := libcutils liblog \ libutils \libxxxdevice \libxxxapi \libxxxcfg \libxxxspdev \libxxxlog\libxxxadapterLOCAL_C_INCLUDES += xxxdroid/external/xxx/device/include \ xxxdroid/external/xxx/lib/libxxxapiclient \ xxxdroid/external/xxx/lib/libspdev \ xxxdroid/external/xxx/lib/libxxxlog LOCAL_C_INCLUDES += $(LOCAL_PATH)LOCAL_SHARED_LIBRARIES += libcutilsinclude $(BUILD_EXECUTABLE)转换后的Android.bp文件如下：
cc_binary { name: "nativetest", srcs: ["apitest.c"], cflags: ["-Wno-error=implicit-function-declaration"], shared_libs: [ "libcutils", "liblog", "libutils", "libxxxdevice", "libxxxapi", "libxxxcfg", "libxxxspdev", "libxxxlog", "libxxxadapter", ] + ["libcutils"], include_dirs: [ "xxxdroid/external/xxx/device/include", "xxxdroid/external/xxx/lib/libxxxapiclient", "xxxdroid/external/xxx/lib/libspdev", "xxxdroid/external/xxx/lib/libxxxlog", ], local_include_dirs: ["."],}1.3.3 生成动态库
先让我们看看生成动态库的的Android.mk的定义：
LOCAL_PATH := $(call my-dir)src_files := xxxmisc.csrc_files += default_misc.c# Share Libraryinclude $(CLEAR_VARS)LOCAL_C_INCLUDES += xxxdroid/external/systool/includeLOCAL_SRC_FILES := \ ${src_files}LOCAL_MODULE := libxxxmiscLOCAL_SHARED_LIBRARIES := liblog libcutilsLOCAL_MODULE_TAGS := optionalinclude $(BUILD_SHARED_LIBRARY)# Static Libraryinclude $(CLEAR_VARS)LOCAL_C_INCLUDES += xxxdroid/external/systool/includeLOCAL_SRC_FILES := \ ${src_files}LOCAL_MODULE := libxxxmiscLOCAL_STATIC_LIBRARIES := liblog libcutilsLOCAL_MODULE_TAGS := optionalinclude $(BUILD_STATIC_LIBRARY)转换后的Android.bp文件如下：
src_files = ["xxxmisc.c"]src_files += ["default_misc.c"]// Share Librarycc_library_shared { include_dirs: ["xxxdroid/external/systool/include"], srcs: src_files, name: "libxxxmisc", shared_libs: [ "liblog", "libcutils", ], }// Static Librarycc_library_static { include_dirs: ["xxxdroid/external/systool/include"], srcs: src_files, name: "libxxxmisc", static_libs: [ "liblog", "libcutils", ], }1.3.4 带宏开关转换失败
在这个Android.mk里面我们带上了宏编译：
include $(CLEAR_VARS)LOCAL_MODULE_TAGS := optionalLOCAL_JAVA_LIBRARIES := servicesLOCAL_SRC_FILES := $(call all-java-files-under, src)ifeq (1,$(strip $(shell expr $(PLATFORM_SDK_VERSION) \>= 28)))LOCAL_SRC_FILES += compat/android-v28-later/XXUtilCompat.javaelseLOCAL_SRC_FILES += compat/default/XXUtilCompat.javaendifLOCAL_SRC_FILES += \ src/com/xxx/aidl/XxxSystemUtil.aidl \ src/com/xxx/aidl/PhysicalKey.aidl \ src/android/bluetooth/IXxxBtPrinter.aidl LOCAL_STATIC_JAVA_LIBRARIES := litepalLOCAL_PROGUARD_FLAG_FILES := proguard.cfg#LOCAL_SDK_VERSION := currentLOCAL_PRIVATE_PLATFORM_APIS := trueLOCAL_PACKAGE_NAME := XxxManagerLOCAL_CERTIFICATE := platform执行androidmk命令进行转换：
android_app { libs: ["services"], srcs: ["src/**/*.java"] + ["compat/android-v28-later/SPUtilCompat.java"] + ["compat/default/SPUtilCompat.java"] + [ // ANDROIDMK TRANSLATION ERROR: unsupported conditional // ifeq (1,$(strip $(shell expr $(PLATFORM_SDK_VERSION) \>= 28))) // ANDROIDMK TRANSLATION ERROR: else from unsupported contitional // else // ANDROIDMK TRANSLATION ERROR: endif from unsupported contitional // endif "src/com/xxx/aidl/XxxSystemUtil.aidl", //LOCAL_SDK_VERSION := current "src/com/xxx/aidl/PhysicalKey.aidl", // ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_PRIVATE_PLATFORM_APIS "src/android/bluetooth/IXxxBtPrinter.aidl", // LOCAL_PRIVATE_PLATFORM_APIS := true ], //the jni callback error!!!!! zhuxy static_libs: ["litepal"], optimize: { proguard_flag_files: ["proguard.cfg"], enabled: false, }, name: "XxxManager",可以看出androidmk对宏的处理是不对的，这个就需要手动处理了，后续章节会重点说到这个的
结语
修行至此，恭喜读者你已经对Android.mk转换成Android.bp有一定了解了，行走江湖是不可能的了，还需多多磨练才行，在后续篇章中让我们一起学习。这里的androidmk不是万能的，有些情况是不行的，譬如有宏或者预编译的情况。
写在最后
各位读者看官朋友们，Android.mk转换成Android.bp，希望能吸引你，激发你的学习欲望和斗志。在最后麻烦读者朋友们如果本篇对你有帮助，关注和点赞一下，当然如果有错误和不足的地方也可以拍砖。
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