先看看引入jar (因為和引用aar很像)

LOCAL_STATIC_JAVA_LIBRARIES := dictenginelib \

org.apache.http.legacy \

constraint-layout-solver-1.1.3_ \

yxp_support-new-v4-annotations-25.3.1 \

yxp_support-new-v4-compat-25.3.1 \

yxp_support-new-v4-core-ui-25.3.1 \

yxp_support-new-v4-fragment-25.3.1 \

yxp_support-new-v4-media-compat-25.3.1 \

yxp_support-new-v4-core-utils-25.3.1 \

yxp_support-new-vector-drawable-25.3.1 \

yxp_support-new-animated-vector-drawable-25.3.1 \

IntelligentLearningScheme_cupboard-2.2.0 \

IntelligentLearningScheme_glide-4.3.1 \

IntelligentLearningScheme_glide_annotations-4.3.1 \

IntelligentLearningScheme_glide_disklrucache-4.3.1 \

IntelligentLearningScheme_glide_gifdecoder-4.3.1\

IntelligentLearningScheme_gson-2.8.5 \

IntelligentLearningScheme_okgo-3.0.4 \

IntelligentLearningScheme_okhttp-3.8.1 \

IntelligentLearningScheme_okio-1.13.0

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := IntelligentLearningScheme_cupboard-2.2.0:libs/cupboard-2.2.0.jar \

IntelligentLearningScheme_glide-4.3.1:libs/glide-4.3.1.jar \

IntelligentLearningScheme_glide_annotations-4.3.1:libs/glide_annotations-4.3.1.jar \

IntelligentLearningScheme_glide_disklrucache-4.3.1:libs/glide_disklrucache-4.3.1.jar \

IntelligentLearningScheme_glide_gifdecoder-4.3.1:libs/glide_gifdecoder-4.3.1.jar \

IntelligentLearningScheme_gson-2.8.5:libs/gson-2.8.5.jar \

IntelligentLearningScheme_okgo-3.0.4:libs/okgo-3.0.4.jar \

IntelligentLearningScheme_okhttp-3.8.1:libs/okhttp-3.8.1.jar \

IntelligentLearningScheme_okio-1.13.0:libs/okio-1.13.0.jar \

constraint-layout-solver-1.1.3_:/../../library/third_jars/constraint-layout-solver-1.1.3.jar \

yxp_support-new-v4-annotations-25.3.1:/../../library/third_jars/support-annotations-25.3.1_.jar \

yxp_support-new-v4-compat-25.3.1:/../../library/third_jars/support-compat-25.3.1_.jar \

yxp_support-new-v4-core-ui-25.3.1:/../../library/third_jars/support-core-ui-25.3.1_.jar \

yxp_support-new-v4-fragment-25.3.1:/../../library/third_jars/support-fragment-25.3.1_.jar \

yxp_support-new-v4-media-compat-25.3.1:/../../library/third_jars/support-media-compat-25.3.1_.jar \

yxp_support-new-v4-core-utils-25.3.1:/../../library/third_jars/support-core-utils-25.3.1_.jar \

yxp_support-new-vector-drawable-25.3.1:/../../library/third_jars/support-vector-drawable-25.3.1_.jar \

yxp_support-new-animated-vector-drawable-25.3.1:/../../library/third_jars/support-animated-vector-drawable-25.3.1_.jar

使用LOCAL_STATIC_JAVA_LIBRARIES 要引入的jar定義一個變量名。

使用LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES 給定義的變量 設置一個引用路徑。

再看引用aar

LOCAL_STATIC_JAVA_AAR_LIBRARIES := IntelligentLearningScheme_appcompat-v7-25.3.1 \

IntelligentLearningScheme_recyclerview-v7-25.3.1 \

IntelligentLearningScheme_constraint-layout-1.1.3 \

IntelligentLearningScheme_utilcode-1.9.9

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := IntelligentLearningScheme_appcompat-v7-25.3.1:/../../library/aars/appcompat-v7-25.3.1.aar \

IntelligentLearningScheme_recyclerview-v7-25.3.1:/../../library/aars/recyclerview-v7-25.3.1.aar \

IntelligentLearningScheme_constraint-layout-1.1.3:/../../library/aars/constraint-layout-1.1.3.aar \

IntelligentLearningScheme_utilcode-1.9.9:libs/utilcode-1.9.9.aar

#需要引入library/aar的包名

LOCAL_AAPT_FLAGS := --auto-add-overlay \

--extra-packages android.support.v7.appcompat \

--extra-packages android.support.constraint \

--extra-packages android.support.v7.recyclerview \

--extra-packages com.blankj.utilcode

可以發現不同的是：

需要使用LOCAL_STATIC_JAVA_AAR_LIBRARIES 來給要引入的aar 定義一個變量(區別于LOCAL_STATIC_JAVA_LIBRARIES)。

需要使用LOCAL_AAPT_FLAGS為aar添加一個包名。

需要注意的是：

android.support.constraint 的 targetSdkVersion='24'

appcompat、recyclerview、cardview 都是 minSdkVersion='9' ， com.blankj.utilcode為 minSdkVersion='14'

所以在androidmianfest.xml加上

android:minSdkVersion="19"

android:targetSdkVersion="24" />

注意：

加上android:targetSdkVersion="24"會有一些問題，因為android6.0(23)加入了動態權限，targetSdkVersion="24"時需添加動態權限代碼。

將targetSdkVersion="24"改為targetSdkVersion="22"則不需要添加動態權限代碼，但是會有編譯錯誤，這里發現，只需要在編譯一次此問題就會解決(比如加一個空格再上傳代碼編譯，就會通過編譯，以u27為例，暫不清楚為什么會這樣，且只發現在constraint 庫上有此問題，知道的同學望指教)。

編譯的apk安裝，有幾率constraint 庫會在setcontentview() 提示找不到此庫。

完整android.mk文件

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_PROGUARD_ENABLED := disabled

LOCAL_MODULE_TAGS := optional

LOCAL_STATIC_JAVA_LIBRARIES := dictenginelib \

org.apache.http.legacy \

constraint-layout-solver-1.1.3_ \

yxp_support-new-v4-annotations-25.3.1 \

yxp_support-new-v4-compat-25.3.1 \

yxp_support-new-v4-core-ui-25.3.1 \

yxp_support-new-v4-fragment-25.3.1 \

yxp_support-new-v4-media-compat-25.3.1 \

yxp_support-new-v4-core-utils-25.3.1 \

yxp_support-new-vector-drawable-25.3.1 \

yxp_support-new-animated-vector-drawable-25.3.1 \

IntelligentLearningScheme_cupboard-2.2.0 \

IntelligentLearningScheme_glide-4.3.1 \

IntelligentLearningScheme_glide_annotations-4.3.1 \

IntelligentLearningScheme_glide_disklrucache-4.3.1 \

IntelligentLearningScheme_glide_gifdecoder-4.3.1\

IntelligentLearningScheme_gson-2.8.5 \

IntelligentLearningScheme_okgo-3.0.4 \

IntelligentLearningScheme_okhttp-3.8.1 \

IntelligentLearningScheme_okio-1.13.0

LOCAL_STATIC_JAVA_AAR_LIBRARIES := IntelligentLearningScheme_appcompat-v7-25.3.1 \

IntelligentLearningScheme_recyclerview-v7-25.3.1 \

IntelligentLearningScheme_constraint-layout-1.1.3 \

IntelligentLearningScheme_utilcode-1.9.9

#LOCAL_ASSET_DIR := $(LOCAL_PATH)/app/src/main/assets

LOCAL_JAVA_LIBRARIES := com.noahedu \

PenWriterLib \

com.writepen \

ucache

LOCAL_RESOURCE_DIR := \

$(addprefix $(LOCAL_PATH)/../../library/yxp_src/dictenginelib/, res) \

$(LOCAL_PATH)/res

# $(addprefix $(LOCAL_PATH)/,$(extrafunction)/src/main/res) \

LOCAL_SRC_FILES := $(call all-java-files-under, src) \

src/com/noahedu/synclearning/engine/IBookService.aidl \

src/com/noahedu/synclearning/engine/IBookServiceCallback.aidl

# $(call all-java-files-under,$(extrafunction)/src/main/java)\

#需要引入library/aar的包名

LOCAL_AAPT_FLAGS := --auto-add-overlay \

--extra-packages com.noahedu.DictEngine \

--extra-packages android.support.v7.appcompat \

--extra-packages android.support.constraint \

--extra-packages android.support.v7.recyclerview \

--extra-packages com.blankj.utilcode

LOCAL_PACKAGE_NAME := IntelligentLearningScheme

LOCAL_CERTIFICATE := testkey

include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

#libs/recyclerview-v7-25.3.1.aar

#$(LOCAL_PATH)/../../library/jars/recyclerview-v7-25.3.1.aar

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := IntelligentLearningScheme_cupboard-2.2.0:libs/cupboard-2.2.0.jar \

IntelligentLearningScheme_glide-4.3.1:libs/glide-4.3.1.jar \

IntelligentLearningScheme_glide_annotations-4.3.1:libs/glide_annotations-4.3.1.jar \

IntelligentLearningScheme_glide_disklrucache-4.3.1:libs/glide_disklrucache-4.3.1.jar \

IntelligentLearningScheme_glide_gifdecoder-4.3.1:libs/glide_gifdecoder-4.3.1.jar \

IntelligentLearningScheme_gson-2.8.5:libs/gson-2.8.5.jar \

IntelligentLearningScheme_okgo-3.0.4:libs/okgo-3.0.4.jar \

IntelligentLearningScheme_okhttp-3.8.1:libs/okhttp-3.8.1.jar \

IntelligentLearningScheme_okio-1.13.0:libs/okio-1.13.0.jar \

constraint-layout-solver-1.1.3_:/../../library/third_jars/constraint-layout-solver-1.1.3.jar \

yxp_support-new-v4-annotations-25.3.1:/../../library/third_jars/support-annotations-25.3.1_.jar \

yxp_support-new-v4-compat-25.3.1:/../../library/third_jars/support-compat-25.3.1_.jar \

yxp_support-new-v4-core-ui-25.3.1:/../../library/third_jars/support-core-ui-25.3.1_.jar \

yxp_support-new-v4-fragment-25.3.1:/../../library/third_jars/support-fragment-25.3.1_.jar \

yxp_support-new-v4-media-compat-25.3.1:/../../library/third_jars/support-media-compat-25.3.1_.jar \

yxp_support-new-v4-core-utils-25.3.1:/../../library/third_jars/support-core-utils-25.3.1_.jar \

yxp_support-new-vector-drawable-25.3.1:/../../library/third_jars/support-vector-drawable-25.3.1_.jar \

yxp_support-new-animated-vector-drawable-25.3.1:/../../library/third_jars/support-animated-vector-drawable-25.3.1_.jar \

IntelligentLearningScheme_appcompat-v7-25.3.1:/../../library/aars/appcompat-v7-25.3.1.aar \

IntelligentLearningScheme_recyclerview-v7-25.3.1:/../../library/aars/recyclerview-v7-25.3.1.aar \

IntelligentLearningScheme_constraint-layout-1.1.3:/../../library/aars/constraint-layout-1.1.3.aar \

IntelligentLearningScheme_utilcode-1.9.9:libs/utilcode-1.9.9.aar

include $(BUILD_MULTI_PREBUILT)

#include $(BUILD_PREBUILT)

# Use the folloing include to make our test apk.

include $(call all-makefiles-under,$(LOCAL_PATH))

如果代碼或者資源不在默認路徑，就需要額外指定，或者指定多個

# ‘:=’是賦值的意思；’+=’是追加的意思；‘\’表示連接符。

LOCAL_MODULE_TAGS :=user eng tests optional

- user: 指該模塊只在user版本下才編譯

- eng: 指該模塊只在eng版本下才編譯

- tests: 指該模塊只在tests版本下才編譯

- optional:指該模塊在所有版本下都編譯

#指定asset目錄

LOCAL_ASSET_DIR := $(LOCAL_PATH)/app/src/main/assets

#指定res目錄

LOCAL_RESOURCE_DIR := \

$(addprefix $(LOCAL_PATH)/../../library/yxp_src/dictenginelib/, res) \

$(LOCAL_PATH)/res

#指定src/aidl目錄

LOCAL_SRC_FILES := $(call all-java-files-under, src) \

src/com/noahedu/synclearning/engine/IBookService.aidl \

src/com/noahedu/synclearning/engine/IBookServiceCallback.aidl \

$(call all-Iaidl-files-under, src/com/noahedu/synclearning/engine/)

#指定arm目錄

LOCAL_PREBUILT_JNI_LIBS_arm := libs/armeabi-v7a/libdecrypt.so \

libs/armeabi-v7a/liblasa.so \

libs/armeabi-v7a/libspeex.so \

libs/armeabi-v7a/libddsdns.so

#指定arm64目錄

LOCAL_PREBUILT_JNI_LIBS_arm64 :=libs/arm64-v8a/libdecrypt.so \

libs/arm64-v8a/liblasa.so \

libs/arm64-v8a/libspeex.so \

libs/arm64-v8a/libddsdns.so

#指定androidmainfest.xml目錄

LOCAL_MANIFEST_FILE := AndroidManifest.xml

發現總是編譯不過的一個問題，看下面這段.mk片段

34行連接符 “ \ ”會把下面的35行的代碼連成一片。 導致下面所有jar aar 都引用不到。因此編譯就會報錯

改正：

如果是注釋：

連接符 “ \ ”后面要空一行。

連接符 “ \ ”后面要空一行。

連接符 “ \ ”后面要空一行。

總結

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