android.os.NetworkOnMainThreadException about aliossflutter HOT 6 OPEN

   private void secretInit() {
        new AsyncTask<MethodCall,Void,Void>(){
            @Override
            protected Void doInBackground(MethodCall... methodCalls) {
                MethodCall _call = methodCalls[0];
                final String accessKeyId = _call.argument("accessKeyId");
                final String accessKeySecret = _call.argument("accessKeySecret");
                final String _id = _call.argument("id");
                final String securityToken = _call.argument("securityToken");
                final OSSCredentialProvider credentialProvider = new OSSStsTokenCredentialProvider(accessKeyId, accessKeySecret, securityToken);
                oss = new OSSClient(registrar.context(), (String) _call.argument("endpoint"), credentialProvider);
                return null;
            }
        }.execute(_call);

        final String _id = _call.argument("id");
        final Map<String, String> m1 = new HashMap();
        m1.put("result", "success");
        m1.put("id", _id);
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                channel.invokeMethod("onInit", m1);
            }
        });
    }

alioss.responseFromUpload.listen((UploadResponse data) {
        if (data.success) {
          callback('http://$endPoint/$bucketName/${data.key}');
        } else {
          callback('0');
        }
      });