Android.mk 增加aar依赖

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本文详述了在Android.mk中整合AAR库的具体步骤，包括如何在Android.mk文件中正确引用AAR库，调整清单文件以兼容库的最低SDK版本，避免R文件合并冲突，以及添加必要的资源目录。

1. Android.mk中增加两处

LOCAL_STATIC_JAVA_AAR_LIBRARIES:= <aar alias> //这里是一处
.
.
.
include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

//这里是第二处
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := <aar alias>:libs/<lib file>.aar

include $(BUILD_MULTI_PREBUILT)

2. 清单文件中设置 minSdkVersion required by library into your manifest file.，否则编译不过

3. 避免编译时将R文件合并，可以使用 LOCAL_AAPT_FLAGS

after compile, the resources in the aar will be added to my main package's R file, but not in the aar package's R file. For example, the aar's package name is my.aar， the main project's package name is my.main. The aar has a string named "string_in_aar". After compile, the strings id is my.main.R.string_in_aar rather than my.aar.R.string_in_aar. This makes the apk crash, because the code in the aar uses my.aar.R.string_in_aar.

The solution is use:

LOCAL_AAPT_FLAGS += --extra-packages {aar package name}.

You will get two R file. They has the some content. One's package is the main package, the other is the aar package.

4. 此后还要添加obj下aar展开的res文件目录，比如

# RES files
#=====================================================================
LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
LOCAL_RESOURCE_DIR +=prebuilts/sdk/current/extras/constraint-layout/res
LOCAL_RESOURCE_DIR +=frameworks/support/v7/appcompat/res
LOCAL_RESOURCE_DIR +=frameworks/support/design/res
LOCAL_RESOURCE_DIR +=frameworks/support-v4/res

如果报错：

android.mk error: commands commence before first target

，则很可能是上一句的换行连接符 \ 之后多了个空格；