移植App源码从Android Studio到系统源码编译

在项目管理中，我们有时候会有需要将Android Studio中的App源码移植到系统源码中编译，与直接将编译打包好的Apk内置到系统中不同，我们需要加上整个src代码和res资源和一些依赖。

Android Studio目录树

server@dev:~/code/app/ToolBox$ tree . ├── Android.mk ├── app │ └── src │ ├── main │ │ ├── AndroidManifest.xml │ │ ├── java │ │ ├── libs │ │ └── res ├── build.gradle ├── gradle ├── gradle.properties ├── local.properties └── settings.gradle 2 directories, 5 files 

将App源码从Android Studio移植到系统源码编译，主要是添加Android.mk，指定src、res、AndroidManifest.xml文件，比较重要的点在于引入第三方依赖库，如jar包、aar包、so库等。以下列出重要的点：

1. 引入第三方依赖库的方式

1.Android系统自带的库 LOCAL_STATIC_ANDROID_LIBRARIES 2.第三方jar包 LOCAL_STATIC_JAVA_LIBRARIES 3.第三方aar包 LOCAL_STATIC_JAVA_AAR_LIBRARIES 4.第三方so库 LOCAL_SHARED_LIBRARIES 

2. 引入aar包注意点

aar包与jar包的不同之处在于，aar包含有资源res 1.编译aar包 别名:路径 include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := xxpermissions:libs/xxpermissions-11.5.aar include $(BUILD_MULTI_PREBUILT) 2.引用 LOCAL_STATIC_JAVA_AAR_LIBRARIES := xxpermissions 3. LOCAL_USE_AAPT2 := true 4.将aar包中的res复制出来，加到 LOCAL_RESOURCE_DIR 下 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res \ $(LOCAL_PATH)/res-xxpermissions \ 5.添加R资源生成别名，这样别人也可以用定义的这些包名访问本app资源 LOCAL_AAPT_FLAGS := \ --auto-add-overlay \ --extra-packages <aar package name> 6.引入第三方aar包最好关闭混淆，不然可能会出现运行时报错 LOCAL_PROGUARD_ENABLED := disabled 

3. 关于如何查找App需要的依赖

1.查看build.gradle下的dependencies dependencies { implementation 'androidx.appcompat:appcompat:1.2.0' implementation 'com.google.android.material:material:1.3.0' implementation 'androidx.constraintlayout:constraintlayout:2.0.4' } 对应的添加 LOCAL_STATIC_ANDROID_LIBRARIES := \ androidx.appcompat_appcompat \ com.google.android.material_material \ androidx-constraintlayout_constraintlayout \ 2.对于第三库的库，可以从github上下载，或直接在Android Studio的Gradle中找到下载的依赖包 2.1 Android Studio以Project的视图模式来查看的时候点开External Libraries,这里面就是所有的compile的包了 2.2选择compile包右键点开选择Library Properity 查看sources路径 ~/.gradle/caches/modules-2/files-2.1/com.github.getActivity/XXPermissions/ 2.3就是这个包的位置 @aar就是找对应的aar包 无则表示找对应的jar包 

Android系统目录树

server@dev:~/Desktop/ToolBox$ tree -L 1 . ├── AndroidManifest.xml ├── Android.mk ├── libs ├── res ├── res-camera2 ├── res-core ├── res-view └── src 6 directories, 2 files 

Android.mk

LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS) LOCAL_PACKAGE_NAME := ToolBox LOCAL_MODULE_TAGS := optional LOCAL_SRC_FILES := $(call all-java-files-under, src) LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res \ $(LOCAL_PATH)/res-camera2 \ $(LOCAL_PATH)/res-core \ $(LOCAL_PATH)/res-view LOCAL_USE_AAPT2 := true LOCAL_STATIC_ANDROID_LIBRARIES := \ androidx.appcompat_appcompat \ com.google.android.material_material \ androidx-constraintlayout_constraintlayout \ androidx.gridlayout_gridlayout \ android-support-v4 LOCAL_STATIC_JAVA_LIBRARIES := \ systembartint \ listenablefuture \ concurrent-futures LOCAL_STATIC_JAVA_AAR_LIBRARIES := \ xxpermissions \ camera-view \ camera-camera2 \ camera-lifecycle \ camera-core LOCAL_AAPT_FLAGS := \ --auto-add-overlay \ --extra-packages androidx.camera.core \ --extra-packages androidx.camera.lifecycle \ --extra-packages androidx.camera.view \ --extra-packages androidx.camera.camera2 \ --extra-packages com.hjq.permissions LOCAL_PRIVATE_PLATFORM_APIS := true LOCAL_CERTIFICATE := platform LOCAL_PROGUARD_ENABLED := disabled include $(BUILD_PACKAGE) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := xxpermissions:libs/xxpermissions-11.5.aar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := systembartint:libs/systembartint-1.0.3.jar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := camera-view:libs/camera-view-1.0.0-alpha14.aar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := camera-lifecycle:libs/camera-lifecycle-1.0.0-beta07.aar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := camera-camera2:libs/camera-camera2-1.0.0-beta07.aar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := camera-core:libs/camera-core-1.0.0-beta07.aar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := listenablefuture:libs/listenablefuture-1.0.jar include $(BUILD_MULTI_PREBUILT) include $(CLEAR_VARS) LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := concurrent-futures:libs/concurrent-futures-1.0.0.jar include $(BUILD_MULTI_PREBUILT) include $(call all-makefiles-under, $(LOCAL_PATH))