获取别名，程序崩溃

[liuweichn]

/// 获取别名 FlutterJPush.getAlias().then((JPushResult result) { if (result.isOk) { print('alias: ${result.result}'); } });

报错：E/AndroidRuntime: FATAL EXCEPTION: MessageReceiver Process: com.gxanxun.smart_maintenance, PID: 21978 java.lang.RuntimeException: Methods marked with @UiThread must be executed on the main thread. Current thread: MessageReceiver at io.flutter.embedding.engine.FlutterJNI.ensureRunningOnMainThread(FlutterJNI.java:807) at io.flutter.embedding.engine.FlutterJNI.invokePlatformMessageResponseCallback(FlutterJNI.java:740) at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply(DartMessenger.java:156) at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.success(MethodChannel.java:225) at com.jzoom.flutterjpush.FlutterJPushPlugin$MyJPushMessageReceiver.onAliasOperatorResult(FlutterJPushPlugin.java:766) at cn.jpush.android.a.b.run(Unknown Source) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.os.HandlerThread.run(HandlerThread.java:61)