安卓全页面嵌入

全页面嵌入flutter使用io.flutter.embedding.android.FlutterActivity

部分页面嵌入

部分页面嵌入flutter使用io.flutter.embedding.android.FlutterView和io.flutter.embedding.engine.FlutterEngine

在onCreate方法里面flutterView.attachToFlutterEngine(flutterEngine);onDestroy方法里面flutterView.detachFromFlutterEngine();同时还要把其他几个声明周期状态传到flutter，例如flutterEngine.getLifecycleChannel().appIsResumed();