Flutter：“未找到方法的实现”- 用于缓存的 Flutter 引擎

Question

I want to call a native method from my flutter app but I have an issue:

No implementation found for method getApplicationDocumentsDirectory on channel my_channel/name

I launch my Flutter app from an existing native Android Application and I want to use some native code from Flutter.

So I use an Flutter engine cache and I register my native method handler but it doesn't work:

        MethodChannel(
        flutterEngine.dartExecutor.binaryMessenger,
        "CHANNEL"
    ).setMethodCallHandler { call, result ->
        when (call.method) {
            "myMethod" -> {
                doMyNativeCode(call, result)
            }
            else -> {
                result.notImplemented()
            }
        }
    }
}

I call this code from Application.onCreate() when I create flutter engine and put it into cache.

But my EventChannel's (listening events from native on flutter) work well .

What's wrong with it?

Answer 1

Maybe my experience can help you.

My issue was exception on native side:

MethodChannel(
    flutterEngine.dartExecutor.binaryMessenger,
    "CHANNEL"
).setMethodCallHandler { call, result ->
    when (call.method) {
        "myMethod" -> {
            // THERE WAS EXCEPTION!!!
        }
        else -> {
            result.notImplemented()
        }
    }
}

}