flutter_harmonyOS 编写自己的插件 (一)

/** ExamOhosUtilsPlugin **/export default class ExamOhosUtilsPlugin implements FlutterPlugin, MethodCallHandler {  private channel: MethodChannel | null = null;  private WXApi:wxopensdk.WXApi| null = null;  private context:common.UIAbilityContext|null = null ;  constructor() {  }
  getUniqueClassName(): string {    return "ExamOhosUtilsPlugin"  }
  onAttachedToEngine(binding: FlutterPluginBinding): void {    this.context = binding.getApplicationContext() as common.UIAbilityContext;    this.channel = new MethodChannel(binding.getBinaryMessenger(), "exam_ohos_utils");    this.channel.setMethodCallHandler(this)
  }
  onDetachedFromEngine(binding: FlutterPluginBinding): void {    if (this.channel != null) {      this.channel.setMethodCallHandler(null)    }  }
  onMethodCall(call: MethodCall, result: MethodResult): void {    console.log("onMethodCall==>" ,call.method);    if (call.method == "getPlatformVersion") {      //测试方法      result.success("OpenHarmony ^ ^ ")    } else {      result.notImplemented()    }  }}

class ExamOhosUtils {  Future<String> getPlatformVersion() {    return ExamOhosUtilsPlatform.instance.getPlatformVersion();  }}

/// An implementation of [ExamOhosUtilsPlatform] that uses method channels.class MethodChannelExamOhosUtils extends ExamOhosUtilsPlatform {  /// The method channel used to interact with the native platform.  @visibleForTesting  final methodChannel = const MethodChannel('exam_ohos_utils');
  @override  Future<String> getPlatformVersion() async {    final version =        await methodChannel.invokeMethod<String>('getPlatformVersion');    return version;  } }

abstract class ExamOhosUtilsPlatform extends PlatformInterface {  /// Constructs a ExamOhosUtilsPlatform.  ExamOhosUtilsPlatform() : super(token: _token);
  static final Object _token = Object();
  static ExamOhosUtilsPlatform _instance = MethodChannelExamOhosUtils();
  /// The default instance of [ExamOhosUtilsPlatform] to use.  ///  /// Defaults to [MethodChannelExamOhosUtils].  static ExamOhosUtilsPlatform get instance => _instance;
  /// Platform-specific implementations should set this with their own  /// platform-specific class that extends [ExamOhosUtilsPlatform] when  /// they register themselves.  static set instance(ExamOhosUtilsPlatform instance) {    PlatformInterface.verifyToken(instance, _token);    _instance = instance;  }
  Future<String> getPlatformVersion() {    throw UnimplementedError('platformVersion() has not been implemented.');  }}

ExamOhosUtils().aliPayAuth("").then((value) {  print(value) ;}) ;