Flutter(七):Flutter混合开发--接入现有原生工程(iOS+Android)
在上一篇文章Flutter(六):Flutter_Boost接入现有原生工程(iOS+Android)中介绍了Flutter_Boost的接入方法,这一篇将介绍Flutter自带的接入方法。
新建工程
1.新建工程
- 1.使用Xcode新建flutter_demo_ios(模拟已有工程)
- 2.使用AndroidStudio新建flutter_demo_android(模拟已有工程)
- 3.使用AndroidStudio新建flutter_demo_flutter(新的flutter库工程)
创建过程可以参考上一篇文章Flutter(六):Flutter_Boost接入现有原生工程(iOS+Android),这里就不再展开了。
备注:
1.AndroidSudio需要安装Dart和Flutter插件
2.flutter工程新建时选择Module
2.新建完成
目录结构如下:
Android接入
1.setting.gradle新增
setBinding(new Binding([gradle: this]))
evaluate(new File(
settingsDir.parentFile,
'flutter_demo_library/.android/include_flutter.groovy'
))
2.app下的build.gradle增加依赖
implementation project(':flutter')
然后执行gradle sync
3.跳转代码
在AndroidManifest.xml
文件中的application
标签中增加:
<activity
android:name="io.flutter.embedding.android.FlutterActivity"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize"
/>
跳转代码
startActivity(FlutterActivity.createDefaultIntent(currentActivity))
iOS接入
1.修改pod文件
flutter_application_path = '../flutter_demo_library'
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
target 'flutter_demo_ios' do
# Comment the next line if you don't want to use dynamic frameworks
use_frameworks!
# Pods for flutter_demo_ios
install_all_flutter_pods(flutter_application_path)
end
post_install do |installer|
flutter_post_install(installer) if defined?(flutter_post_install)
end
执行pod install
,podhelper.rb 脚本会把你的 plugins, Flutter.framework,和 App.framework 集成到你的项目中。
2.修改AppDelegate
import UIKit
import Flutter
import FlutterPluginRegistrant
@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
lazy var flutterEngine = FlutterEngine(name: "my flutter engine")
override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
flutterEngine.run()
GeneratedPluginRegistrant.register(with: self.flutterEngine)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
3.修改ViewController中的跳转代码
let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine
let flutterViewController = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
self.navigationController?.pushViewController(flutterViewController, animated: true)
ViewController记得还需要import Flutter
,至此iOS接入完毕,使用模拟器也可以正常执行。
问题集锦
Android
1、Caused by: org.gradle.api.InvalidUserCodeException: Build was configured to prefer settings repositories over project repositories but repository 'maven' was added by plugin class 'FlutterPlugin'
原因:Android项目和Flutter项目的Gradle配置不一样
解决方案:
1、只是demo的话,把Flutter/.android/根目录下的setting.gradle和build.gradl拷贝到Android/根目录下,替换Android项目自带的
2、如果是老的工程,可以参考Flutter 混合开发组件化与工程化架构
2.解决Flutter 交互页面可见之前会有一个短暂的延迟
原因:每一个 FlutterActivity 默认会创建它自己的 FlutterEngine。每一个 FlutterEngine 会有一个明显的预热时间。这意味着加载一个标准的 FlutterActivity 时,在你的 Flutter 交互页面可见之前会有一个短暂的延迟。
解决方案:想要最小化这个延迟时间,你可以在抵达你的 FlutterActivity 之前,初始化一个 FlutterEngine,然后使用这个已经预热好的 FlutterEngine。
在Application加入代码:
class MyApplication : Application() {
lateinit var flutterEngine : FlutterEngine
override fun onCreate() {
super.onCreate()
// Instantiate a FlutterEngine.
flutterEngine = FlutterEngine(this)
// Start executing Dart code to pre-warm the FlutterEngine.
flutterEngine.dartExecutor.executeDartEntrypoint(
DartExecutor.DartEntrypoint.createDefault()
)
// Cache the FlutterEngine to be used by FlutterActivity.
FlutterEngineCache
.getInstance()
.put("my_engine_id", flutterEngine)
}
}
跳转代码:
startActivity(FlutterActivity
.withCachedEngine("my_engine_id")
.build(this))