Struct Arg 

pub struct Arg<T: ReferenceType> { /* private fields */ }

FFI: Use Arg<java::lang::Object> instead of jobject. This represents a (null?) function argument.

Unlike most Java reference types from this library, this can be null.

FFI safe where a jobject is safe, assuming you match your types correctly. Using the wrong type may result in soundness issues, but at least on Android mostly seems to just result in JNI aborting execution for the current process when calling methods on an instance of the wrong type.

Implementations

impl<T: ReferenceType> Arg<T>

pub unsafe fn from_raw(object: jobject) -> Self

Safety

unsafe: There’s no guarantee the jobject being passed is valid or null, nor any means of checking it.

pub fn as_raw(&self) -> jobject

Returns the raw JNI reference pointer.

pub unsafe fn into_ref<'env>(self, env: Env<'env>) -> Option<Ref<'env, T>>

Safety

unsafe: This assumes the argument belongs to the given Env, which is technically unsound. However, the intended use case of immediately converting any Arg into Ref at the start of a JNI callback, where Java directly invoked your function with an Env + arguments, is sound.

pub unsafe fn into_local<'env>(self, env: Env<'env>) -> Option<Local<'env, T>>

Safety

unsafe: This assumes the argument belongs to the given Env, which is technically unsound. However, the intended use case of immediately converting any Arg into Local at the start of a JNI callback, where Java directly invoked your function with an Env + arguments, is sound.

pub unsafe fn into_global(self, env: Env<'_>) -> Option<Global<T>>

This equals Arg::into_ref + Ref::as_global.

Safety

unsafe: The same as Arg::into_ref.