Flutter 我想在插件中执行这个方法，我应该怎么做

我正在做一个外部物理键盘输入功能，扫描代码枪以获取数据，执行此方法，然后从插件返回到颤振应用程序

现在我有一个问题，如何在插件中重写这个方法，它目前是无效的

---

颤振提供了一种使用

MethodChannel

与本机平台代码通信的方法

从颤振

MethodChannel

文档（）：

Flatter使用灵活的系统，允许您调用特定于平台的API，无论是Android上的Kotlin或Java代码，还是iOS上的Swift或Objective-C代码

注意：如果需要，方法调用也可以反向发送，平台充当Dart中实现的方法的客户端。一个具体的例子是[quick_actions][2]插件

MethodChannel

从flatter调用本机平台代码上的函数的用法：

static final channelName = 'com.example.widget/keyEvent';
final methodChannel = MethodChannel(channelName);

await this.methodChannel.invokeMethod("dispatchKeyEvent");

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends FlutterActivity {
  private static final String CHANNEL = "com.example.widget/keyEvent";

  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
  super.configureFlutterEngine(flutterEngine);
    new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
        .setMethodCallHandler(
          (call, result) -> {
            if (call.method.equals("dispatchKeyEvent")) {
              //TODO: Call the dispatch key event function here
              bool resultValue;

              if (data != null) {
                result.success(data);
              } else {
                result.error("UNAVAILABLE", "Result not available", null);
              }
            } else {
              result.notImplemented();
            }
          }
        );
  }
}

我们在flatter、iOS和Android中创建一个同名的方法通道对象。Android和iOS对象将设置一个方法调用处理程序来接收来自Flatter的调用。然后，flatter代码可以调用invokeMethod来调用本机对象上的处理程序

颤振：

static final channelName = 'com.example.widget/keyEvent';
final methodChannel = MethodChannel(channelName);

await this.methodChannel.invokeMethod("dispatchKeyEvent");

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends FlutterActivity {
  private static final String CHANNEL = "com.example.widget/keyEvent";

  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
  super.configureFlutterEngine(flutterEngine);
    new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
        .setMethodCallHandler(
          (call, result) -> {
            if (call.method.equals("dispatchKeyEvent")) {
              //TODO: Call the dispatch key event function here
              bool resultValue;

              if (data != null) {
                result.success(data);
              } else {
                result.error("UNAVAILABLE", "Result not available", null);
              }
            } else {
              result.notImplemented();
            }
          }
        );
  }
}

Android:

static final channelName = 'com.example.widget/keyEvent';
final methodChannel = MethodChannel(channelName);

await this.methodChannel.invokeMethod("dispatchKeyEvent");

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends FlutterActivity {
  private static final String CHANNEL = "com.example.widget/keyEvent";

  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
  super.configureFlutterEngine(flutterEngine);
    new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
        .setMethodCallHandler(
          (call, result) -> {
            if (call.method.equals("dispatchKeyEvent")) {
              //TODO: Call the dispatch key event function here
              bool resultValue;

              if (data != null) {
                result.success(data);
              } else {
                result.error("UNAVAILABLE", "Result not available", null);
              }
            } else {
              result.notImplemented();
            }
          }
        );
  }
}

---

感谢您的评论，我想实现的功能是覆盖插件中的dispatchKeyEvent方法。请添加一个复制您的问题的示例！