robertohuertasm

[package]
name = "rustylib"
version = "0.1.0"
authors = ["Roberto Huertas <[email protected]>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[lib]
name = "rustylib"

robertohuertasm

use std::ffi::{CStr, CString};
use std::os::raw::c_char;

#[no_mangle]
pub unsafe extern "C" fn hello(to: *const c_char) -> *mut c_char {
    let c_str = CStr::from_ptr(to);
    let recipient = match c_str.to_str() {
        Ok(s) => s,
        Err(_) => "you",
    };

robertohuertasm

#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

char *hello(const char *to);

void hello_release(char *s);

robertohuertasm

import SwiftUI

struct ContentView: View {
    let s = getName()
    var body: some View {
        Text(s)
    }
}

struct ContentView_Previews: PreviewProvider {

robertohuertasm

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let result = hello("Rob")
        let s_result = String(cString: result!)
        // IMPORTANT: once we get the result we have to release the pointer.

robertohuertasm

#![cfg(target_os = "android")]
#![allow(non_snake_case)]

use crate::hello;
use jni::objects::{JClass, JString};
use jni::sys::jstring;
use jni::JNIEnv;
use std::ffi::CString;

// NOTE: RustKt references the name rusty.kt, which will be the kotlin file exposing the functions below.

robertohuertasm

#!/usr/bin/env bash
# set the version to use the library
min_ver=22
# verify before executing this that you have the proper targets installed
cargo ndk --target aarch64-linux-android --android-platform ${min_ver} -- build --release
cargo ndk --target armv7-linux-androideabi --android-platform ${min_ver} -- build --release
cargo ndk --target i686-linux-android --android-platform ${min_ver} -- build --release
cargo ndk --target x86_64-linux-android --android-platform ${min_ver} -- build --release

# moving libraries to the android project

robertohuertasm

package com.robertohuertas.rusty_android_lib

external fun hello(to: String): String
external fun helloDirect(to: String): String

fun loadRustyLib() {
    System.loadLibrary("rustylib")
}

robertohuertasm

package com.robertohuertas.rusty_android

import android.os.Bundle
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.widget.TextView

import kotlinx.android.synthetic.main.activity_main.*

robertohuertasm

package com.robertohuertas.rusty_flutter_lib

// importing the Android library
import com.robertohuertas.rusty_android_lib.*

import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugin.common.MethodChannel.MethodCallHandler
import io.flutter.plugin.common.MethodChannel.Result
import io.flutter.plugin.common.PluginRegistry.Registrar