如何在 Android 和 AWS Lambda 之间共享请求/响应 class

Question

With an Android app that uses AWS Lambda, the Request/Response classes appear in both sides under the different modules of the same project. If not shared, the two classes will appear in 2 places:

.
├── app
│   └── src
│       ├── main
│       │   └── java
│       │       └── com
│       │           └── myapp
│       │              ├── Request.java
│       │              └── Response.java
│       └── test
├── lambda
│   └── src
│       └── main
│           └── java
│               └── com
│                   └── myapp
│                      ├── Request.java
│                      └── Response.java

The first idea to share these classes is to add lambda module as a dependency to the app module, by adding the following to app/build.gradle :

dependencies {
    implementation project(":lambda")

But that wouldn't work, since

• lambda project depends on the AWK SDK
• app project depends on AWS Mobile SDK

and they are not compatible with each other (both provides some same classes under the same package).

The second method is to use symbolic links, linking the Request/Response classes so that they appear in both modules (under the same package of course), which works. Is it the proper way to do it though?

Answer 1

I would create a third area, specifically for "common" code. Something like:

├── app
│   └── src
│       ├── main
│       │   └── java
│       │       └── com
│       │           └── myapp
│       └── test
│
├── lambda
│   └── src
│       └── main
│           └── java
│               └── com
│                   └── myapp
├── common
│    └── src
│       └── main
│           └── java
│               └── com
│                   └── myapp
│                      ├── Request.java
│                      └── Response.java

and then have the common library be a dependency for both the Android and the Lambda code.