android中Android.mk文件的写法

悠悠 2022-06-15 12:07 303阅读 0赞

在源码中编译的时候要用mk文件来配置java文件和资源文件才能编译。

就应用来说，通常在src和res文件夹同级的目录有一个mk文件来控制编译，我感觉 eclipse的目录层级和androidstudio相比较起来更“像”是源码里的应用的目录结构。

比如说闹钟系统app的位置  alps/packages/apps/DeskClock/

在这个文件夹下的结构如下图

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可以看到这里有Android.mk文件

LOCAL_PATH := $(call my-dir)
    include $(CLEAR_VARS)
    
    LOCAL_RESOURCE_DIR := packages/apps/DeskClock/res
    LOCAL_RESOURCE_DIR += frameworks/opt/datetimepicker/res
    
    ifeq ($(TARGET_BUILD_APPS),)
    LOCAL_RESOURCE_DIR += frameworks/support/design/res
    LOCAL_RESOURCE_DIR += frameworks/support/v7/appcompat/res
    LOCAL_RESOURCE_DIR += frameworks/support/v7/gridlayout/res
    LOCAL_RESOURCE_DIR += frameworks/support/v7/recyclerview/res
    else
    LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/design/res
    LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/appcompat/res
    LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/gridlayout/res
    LOCAL_RESOURCE_DIR += prebuilts/sdk/current/support/v7/recyclerview/res
    endif
    
    LOCAL_CERTIFICATE := platform
    
    LOCAL_PROGUARD_ENABLED := disabled
    
    LOCAL_MODULE_TAGS := optional
    #LOCAL_SDK_VERSION := current
    
    LOCAL_PACKAGE_NAME := DeskClock
    LOCAL_OVERRIDES_PACKAGES := AlarmClock
    
    LOCAL_SRC_FILES := $(call all-java-files-under, src gen)
    
    LOCAL_STATIC_JAVA_LIBRARIES := android-opt-datetimepicker
    LOCAL_STATIC_JAVA_LIBRARIES += messageformat
    LOCAL_STATIC_JAVA_LIBRARIES += android-support-design
    LOCAL_STATIC_JAVA_LIBRARIES += android-support-v13
    LOCAL_STATIC_JAVA_LIBRARIES += android-support-v7-appcompat
    LOCAL_STATIC_JAVA_LIBRARIES += android-support-v7-gridlayout
    LOCAL_STATIC_JAVA_LIBRARIES += android-support-v7-recyclerview
    
    LOCAL_AAPT_FLAGS := --auto-add-overlay
    LOCAL_AAPT_FLAGS += --extra-packages android.support.design
    LOCAL_AAPT_FLAGS += --extra-packages android.support.v7.appcompat
    LOCAL_AAPT_FLAGS += --extra-packages android.support.v7.gridlayout
    LOCAL_AAPT_FLAGS += --extra-packages android.support.v7.recyclerview
    LOCAL_AAPT_FLAGS += --extra-packages com.android.datetimepicker
    LOCAL_AAPT_FLAGS += --extra-packages com.android.messageformat
    
    LOCAL_PROGUARD_FLAG_FILES := ../../../frameworks/support/design/proguard-rules.pro
    
    include $(BUILD_PACKAGE)

看着很乱，分层次来看就很清楚了。首先第一句 LOCAL\_PATH := $(call my-dir) 定义了当前文件夹路径就是LOCAL\_PATH ，

然后 从    include $(CLEAR\_VARS) 到 include $(BUILD\_PACKAGE) 这就是一个编译模块了。

include $(CLEAR\_VARS) ：清空参数

include $(BUILD\_PACKAGE) ：编译模块（类型）include $(BUILD\_PACKAGE) ，就是说要编译个App出来，如果是include $(BUILD\_STATIC\_JAVA\_LIBRARY)就是编译个jar包出来。还有其他的。。

剩下的这两行中间的就是这个模块的配置了。

这些配置都是有固定的意义，而且没有先后顺序。

LOCAL\_RESOURCE\_DIR：res文件夹（资源）用那些资源文件夹就往里+  
TARGET\_BUILD\_APPS：是编App还是编系统什么的，网上查一下，因为mk好像有很多这种固定的变量

LOCAL\_CERTIFICATE := platform ：表示是平台的，也就是系统应用要系统签名

LOCAL\_PACKAGE\_NAME := DeskClock ：生成的apk的名字还有它的文件夹的名字（位于alps/out/target/product/xxxx/system/app/）

LOCAL\_OVERRIDES\_PACKAGES := AlarmClock  覆盖的包名，例如一些厂商定制要覆盖掉原生的

LOCAL\_SRC\_FILES := $(call all-java-files-under, src gen)：src,gen 这些文件夹下的java都要参与编译，也可以像res一样+

LOCAL\_PROGUARD\_ENABLED := disabled ：代码要不要混淆