Flutter插件开发按官方文档提示创建插件Android端提示getFlutterView()方法找不到

1、问题描述:
Flutter插件开发按官方文档提示创建插件Android端提示getFlutterView()方法找不到

2、文档代码(提示getFlutterView()方法找不到):

new MethodChannel(getFlutterView(), CHANNEL).setMethodCallHandler(
                new MethodChannel.MethodCallHandler() {
                    @Override
                    public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
                        if (call.method.equals("getBatteryLevel")) {
                            int batteryLevel = getBatteryLevel();

                            if (batteryLevel != -1) {
                                result.success(batteryLevel);
                            } else {
                                result.error("UNAVAILABLE", "Battery level not available.", null);
                            }
                        } else {
                            result.notImplemented();
                        }
                    }
                }
        );

修改后的代码:

        new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(
                new MethodChannel.MethodCallHandler() {
                    @Override
                    public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
                        if (call.method.equals("getBatteryLevel")) {
                            int batteryLevel = getBatteryLevel();

                            if (batteryLevel != -1) {
                                result.success(batteryLevel);
                            } else {
                                result.error("UNAVAILABLE", "Battery level not available.", null);
                            }
                        } else {
                            result.notImplemented();
                        }
                    }
                }
        );

3、解决方案:
将getFlutterView()替换为getFlutterEngine().getDartExecutor().getBinaryMessenger()