如何使用flutter在android中使用已安装的应用程序

import 'package:flutter/services.dart';

class AppLauncher {
  static const MethodChannel _channel =
      const MethodChannel('app_launcher');

  static Future<void> launchApp(String packageName) async {
    try {
      await _channel.invokeMethod('launchApp', {'packageName': packageName});
    } catch (e) {
      print('Error launching app: $e');
    }
  }
}

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 = "app_launcher";

    @Override
    public void configureFlutterEngine(FlutterEngine flutterEngine) {
        super.configureFlutterEngine(flutterEngine);

        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
                .setMethodCallHandler(
                        (call, result) -> {
                            if (call.method.equals("launchApp")) {
                                String packageName = call.argument("packageName");
                                launchApp(packageName);
                                result.success(null);
                            } else {
                                result.notImplemented();
                            }
                        }
                );
    }

    private void launchApp(String packageName) {
        Intent launchIntent = getPackageManager().getLaunchIntentForPackage(packageName);
        if (launchIntent != null) {
            startActivity(launchIntent);
        }
    }
}

AppLauncher.launchApp("com.example.app");