Delta Chat Rust 集成在 Spring 启动应用程序中

Question

i'm currently building a Spring Boot Application and i want to send some Mails via Chat over IMAP. Deltachat implements COI. DeltaChat offers an API written in RUST. https://github.com/deltachat/deltachat-core-rust

As written here https://support.delta.chat/t/bindings-for-java/970

The Java Bindings should be implemented by the Android App https://github.com/deltachat/deltachat-android/tree/master/src/com/b44t/messenger

Plus I need to get up the JNI: https://github.com/deltachat/deltachat-android/tree/master/jni

I copied the two folders jni and messenger into a separate java project along with deltachat-core-rust Projekt. However, I am not sure how to connect the Java classes to the C code. What is the best way to do this? In the JNI folder there is still the Android.mk class, do I have to implement what is implemented there myself?

Answer 1

The dc_wrapper.c file contains C functions of the form Java_com_b44t_* that implements the native methods in the corresponding Java package .

In order to get this working on any platform, you need to create a build system (Make, CMake, Xmake, Ninja, ...) that:

1. compiles the Rust crate into a static library;
2. compiles the dc_wrapper.c into a dynamically loadable library that is linked with the rust crate.

Finally, you can use the com.b44t.messenger.* classes from Java, which should automatically load the library created in step two. The android.mk file is mostly android-specific compile options, so you should not look too hard at it.