Request – Response API for Android Wear 2.0?

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How do I implement a request-response protocol for an Android Wear 2.0 app?

When I tap on a button on the watch, I want it to fetch some data from the phone and display it on the watch’s screen.

What I tried:

I implemented a working example using the MessageApi, but I don’t like it. I send a dummy "request" in one place using one method, I disregard the PendingResult and then hope that eventually I will receive a message that will be a corresponding response.

Ideally, what I’d like to have is:
byte[] responseBytes = sendRequest(someRequestBytes);

I’m not sure what you have tried.

But this code should work to send a byte array.
Wearable.MessageApi.sendMessage(googleApiClient, transcriptionNodeId,
new ResultCallback() {
public void onResult(SendMessageResult sendMessageResult) {
if (!sendMessageResult.getStatus().isSuccess()) {
// Failed to send message
voiceData is a simple byte array. This array will be received by both wearable and handheld device.

To retrieve the data use this:@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals(YOUR_TEXT)) {
messageEvent.getData();//this is your byte array
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