提交

native/mylib/src/lib.rs

@@ -9,7 +9,9 @@ use jni::objects::{JClass, JString};
 // This is just a pointer. We'll be returning it from our function. We
 // can't return one of the objects with lifetime information because the
 // lifetime checker won't let us.
-use jni::sys::jstring;
+use jni::sys::{jstring, jint};
+
+use std::any::Any;
 // This keeps rust from "mangling" the name and making it unique for this
 // crate.
 #[no_mangle]
@@ -33,4 +35,10 @@ pub extern "system" fn Java_HelloWorld_hello(env: JNIEnv,
         .expect("Couldn't create java string!");
     // Finally, extract the raw pointer to return.
     output.into_inner()
-}
+}
+
+#[no_mangle]
+#[allow(non_snake_case)]
+pub extern "system" fn Java_MyMath_add(env: JNIEnv, class: JClass, a: jint, b: jint) -> jint {
+    return a + b;
+}