文章目录

• • • • • • 环境
          • 调用流程
      • flutter 调用.cpp
      • • • native_lib.cpp
          • 新建android\CMakeLists.txt
          • app/build.gradle
          • local.properties
          • native_add.dart
      • flutter 调用rust
      • • • 创建 flutter项目或者插件
          • 添加依赖
          • 在根目录下创建rust项目
          • 配置
          • 添加run_gen.sh
          • 其他命令
          • gradle.properties app/build.gradle
          • ios 配置
          • Runner-Bridging-Header.h
          • AppDelegate.swift 添加
          • 参考文档

环境

Python 3.11.0
rustc 1.68.0 (2c8cc3432 2023-03-06)
Mac

调用流程

c++或rust
anoidrd生成so文件， ios生成.a文件
通过ffi间接调用

flutter 调用.cpp

native_lib.cpp

#include 
#include 
extern "C" {__attribute__((visibility("default"))) __attribute__((used))int32_t native_add(int32_t x, int32_t y) {return x + y;}__attribute__((visibility("default"))) __attribute__((used))int32_t native_add2(int32_t x, int32_t y) {return x + y;}__attribute__((visibility("default"))) __attribute__((used))char* concat(const char* str1, const char* str2) {int len1 = strlen(str1);int len2 = strlen(str2);char* result = new char[len1 + len2 + 1];strcpy(result, str1);strcat(result, str2);return result;}
}extern "C" __attribute__((visibility("default"))) __attribute__((used))
int32_t native_add3(int32_t x, int32_t y) {return x + y;}

新建android\CMakeLists.txt

 cmake_minimum_required(VERSION 3.18.1) # for exampleadd_library(native_lib# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).../ios/Runner/native_lib.cpp )

app/build.gradle

    externalNativeBuild {// Encapsulates your CMake build configurations.cmake {// Provides a relative path to your CMake build script.path "../CMakeLists.txt"}}

local.properties

ndk.dir=C:\sdk\androidsdk\Android\Sdk\ndk\24.0.8215888

native_add.dart

import 'dart:ffi' as ffi;
import 'dart:ffi';
import 'dart:io'; // For Platform.isXimport 'package:ffi/ffi.dart';final DynamicLibrary nativeAddLib = Platform.isAndroid? DynamicLibrary.open("libnative_lib.so"): DynamicLibrary.process();final int Function(int x, int y) nativeAdd = nativeAddLib.lookup>("native_add").asFunction();final int Function(int x, int y) nativeAdd2 = nativeAddLib.lookup>("native_add2").asFunction();final int Function(int x, int y) nativeAdd3 = nativeAddLib.lookup>("native_add3").asFunction();typedef A2 = Pointer Function(ffi.Pointer, ffi.Pointer);String concatStr(String str1, String str2) {final privateKeyPtr = str1.toNativeUtf8();final hexCidMessagePtr = str2.toNativeUtf8();final concat =nativeAddLib.lookup>('concat').asFunction();return concat(privateKeyPtr, hexCidMessagePtr).toDartString();
}bool isExistSymbol(String symbol) {final isOk = nativeAddLib.providesSymbol(symbol);return isOk;
}

flutter 调用rust

创建 flutter项目或者插件

添加依赖

flutter_rust_bridge: ^1.71.0
ffi: ^2.0.1
ffigen: ^7.2.8

在根目录下创建rust项目

cargo new --lib native
拷贝api.rs,lib.rs

//lib.rs
mod api;
mod bridge_generated;//api.ts
// This is the entry point of your Rust library.
// When adding new code to your project, note that only items used
// here will be transformed to their Dart equivalents.// A plain enum without any fields. This is similar to Dart- or C-style enums.
// flutter_rust_bridge is capable of generating code for enums with fields
// (@freezed classes in Dart and tagged unions in C).
pub enum Platform {Unknown,Android,Ios,Windows,Unix,MacIntel,MacApple,Wasm,
}// A function definition in Rust. Similar to Dart, the return type must always be named
// and is never inferred.
pub fn platform() -> Platform {// This is a macro, a special expression that expands into code. In Rust, all macros// end with an exclamation mark and can be invoked with all kinds of brackets (parentheses,// brackets and curly braces). However, certain conventions exist, for example the// vector macro is almost always invoked as vec![..].//// The cfg!() macro returns a boolean value based on the current compiler configuration.// When attached to expressions (#[cfg(..)] form), they show or hide the expression at compile time.// Here, however, they evaluate to runtime values, which may or may not be optimized out// by the compiler. A variety of configurations are demonstrated here which cover most of// the modern oeprating systems. Try running the Flutter application on different machines// and see if it matches your expected OS.//// Furthermore, in Rust, the last expression in a function is the return value and does// not have the trailing semicolon. This entire if-else chain forms a single expression.if cfg!(windows) {Platform::Windows} else if cfg!(target_os = "android") {Platform::Android} else if cfg!(target_os = "ios") {Platform::Ios} else if cfg!(all(target_os = "macos", target_arch = "aarch64")) {Platform::MacApple} else if cfg!(target_os = "macos") {Platform::MacIntel} else if cfg!(target_family = "wasm") {Platform::Wasm} else if cfg!(unix) {Platform::Unix} else {Platform::Unknown}
}// The convention for Rust identifiers is the snake_case,
// and they are automatically converted to camelCase on the Dart side.
pub fn rust_release_mode() -> bool {cfg!(not(debug_assertions))
}pub fn test() -> String {String::from("这是一个rust函数")
}

配置

Cargo.toml

[package]
name = "native"
version = "0.1.0"
edition = "2021"[lib]
name = "native"
crate-type = ["staticlib", "cdylib"][build-dependencies]
flutter_rust_bridge_codegen = "=1.71.0"[dependencies]
flutter_rust_bridge = "=1.71.0"
flutter_rust_bridge_macros = "=1.71.0"

添加run_gen.sh

flutter_rust_bridge_codegen \--rust-input native/src/api.rs \--dart-output lib/bridge_generated.dart \--c-output ios/Classes/bridge_generated.h

其他命令

cargo install flutter_rust_bridge_codegen
android相关
cargo install cargo-ndk
rustup target add aarch64-linux-android
rustup target add armv7-linux-androideabi
rustup target add x86_64-linux-android
rustup target add i686-linux-android
ios相关
64 bit targets (真机 & 模拟器):
rustup target add aarch64-apple-ios x86_64-apple-ios
New simulator target for Xcode 12 and later
ustup target add aarch64-apple-ios-sim

gradle.properties app/build.gradle

ANDROID_NDK=/Users/yujunlong/Library/Android/sdk/ndk/24.0.8215888

[Debug: null,Profile: '--release',Release: '--release'
].each {def taskPostfix = it.keydef profileMode = it.valuetasks.whenTaskAdded { task ->if (task.name == "javaPreCompile$taskPostfix") {task.dependsOn "cargoBuild$taskPostfix"}}tasks.register("cargoBuild$taskPostfix", Exec) {workingDir "../../native"environment ANDROID_NDK_HOME: "$ANDROID_NDK"commandLine 'cargo', 'ndk',// the 2 ABIs below are used by real Android devices'-t', 'armeabi-v7a','-t', 'arm64-v8a','-t', 'x86','-t', 'x86_64','-o', '../android/app/src/main/jniLibs', 'build'if (profileMode != null) {args profileMode}}
}

ios 配置

在native（rust项目下面）下面执行
cargo xcode
在 Xcode 中打开 ios/Runner.xcodeproj
xcode中选中Runner 然后File —> Add Files to “Runner”
native.xcodeproj
点击 Runner 根项目，TARGETS —> Build Phases —> Target Dependencies ：请添加 native-staticlib
展开 Link Binary With Libraries：添加 libnative_static.a

Runner-Bridging-Header.h

#import "GeneratedPluginRegistrant.h"
#import "bridge_generated.h"

AppDelegate.swift 添加

print(“dummy_value=(dummy_method_to_enforce_bundling())”);

import UIKit
import Flutter@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {override func application(_ application: UIApplication,didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {print("dummy_value=\(dummy_method_to_enforce_bundling())");GeneratedPluginRegistrant.register(with: self)return super.application(application,       didFinishLaunchingWithOptions: launchOptions)}
}

参考文档

Flutter和Rust如何优雅的交互

flutter_rust_bridge
flutter调用cpp