Android附近的消息API发布'Expected BEGIN_OBJECT but was STRING'

Question

我正在尝试使用附近的示例并遵循此 link： https://developers.google.com/nearby/messages/android/pub-sub

我想订阅并发布一个小文本。所以我补充说：

private Message mActiveMessage;

private void publish(String message) {
    Log.i(TAG, "Publishing message: " + message);
    mActiveMessage = new Message(message.getBytes());
    Nearby.Messages.publish(mGoogleApiClient, mActiveMessage);
}

然后点击按钮：

btnPublish.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            publish("Hello World");
        }
    });

并尝试在其他 phone onFound:

上接收它

public void onFound(final Message message) {
            // Called when a new message is found.
            mNearbyDevicesArrayAdapter.add(
                    DeviceMessage.fromNearbyMessage(message).getMessageBody());

            String messageAsString = new String(message.getContent());
            Log.d(TAG, "Found message: " + messageAsString);
            Toast.makeText(getBaseContext(), messageAsString, Toast.LENGTH_LONG).show();

但我得到错误：

    E/AndroidRuntime: FATAL EXCEPTION: main 
gms.nearby.messages.samples.nearbydevices, PID: 733
com.google.gson.JsonSyntaxException: 
java.lang.IllegalStateException: 
Expected BEGIN_OBJECT but was STRING at line 1

我做错了什么？因为我认为我不需要像这里建议的那样去解析它： GSON: Expected BEGIN_OBJECT but was STRING

另一个关于附近的问题：可以只使用超声波到 public 文本吗？

感谢您的宝贵时间。

Answer 1

删除这一行：

mNearbyDevicesArrayAdapter.add(
        DeviceMessage.fromNearbyMessage(message).getMessageBody());

DeviceMessage.fromNearbyMessage(message) 调用假定消息字节为 JSON 并尝试解析它，但您发布的消息不是 JSON。

Android附近的消息API发布'Expected BEGIN_OBJECT but was STRING'

Android Nearby Messages API Publish 'Expected BEGIN_OBJECT but was STRING'

android

publish-subscribe

google-nearby