如何检测手表中是否已安装我的Android应用的Wear应用

Question

Is it somehow possible to detect if the Wear mini app inside an Android app is already installed in the watch?

I have an app which cannot be used on the phone until the Wear part is installed in the watch, so I want to block all interaction until then.

What about app updates, is it possible to detect if the Wear part was already updated?

EDIT:

It looks like the Data API and even Message API calls are buffered and delivered after the app is installed. This however does not solve the issue with app updates. That is solvable with the accepted answer.

Answer 1

AFAIK, there is no out-of-the-box solution to do it.

If your Wear app does not have activities (and therefore no means to be started by user), what you can do is send something like IS_INSTALLED message to Wear periodically while handheld app is in foreground until Wear won't put it version number into data layer. On application update you can check for version number in data layer and if it's lower than current version - repeat the procedure.

This approach will as well solve problem with Wear device not being connected (or out-of-range which is essentially the same).

Answer 2

One Solution is to use CapabilityClient( https://developers.google.com/android/reference/com/google/android/gms/wearable/CapabilityClient ). First you can detect whether the Wearable and phone are connected or not using NodeClient( https://developers.google.com/android/reference/com/google/android/gms/wearable/NodeClient ). Below I have mentioned the code to detect whether the watch is connected to phone or not in android.

    Task<List<Node>> nodesTask = Wearable.getNodeClient(MainMobileActivity.this)
            .getConnectedNodes();
    nodesTask.addOnSuccessListener(new OnSuccessListener<List<Node>>() {

        @Override
        public void onSuccess(List<Node> nodes) {
            nodeSize = nodes.size();
            for (Node node : nodes) {
                Wearable.getMessageClient(MainMobileActivity.this)
                        .sendMessage(node.getId(), MESSAGE_PATH, "Hello from AndroidWear".getBytes());
            }

            Log.d("Hello" , "Message sent to Cordova");
        }
    });

So, nodeSize tells how many nodes/watches are connected.

Wearable.getMessageClient(MainMobileActivity.this)
                        .sendMessage(node.getId(), MESSAGE_PATH, "Hello from AndroidWear".getBytes());

This piece of code helps to send the message from phone to watch. Now coming to detect whether the watch has the application or not. Below is the mentioned code for it.

    Task<CapabilityInfo> capabilityTask = Wearable.getCapabilityClient(this)
            .getCapability(CAPABILITY_WEAR_APP, CapabilityClient.FILTER_REACHABLE);
    capabilityTask.addOnSuccessListener(new OnSuccessListener<CapabilityInfo>() {
        @Override
        public void onSuccess(CapabilityInfo capabilityInfo) {
            mWearNodesWithApp = capabilityInfo.getNodes();

        }
    });

So, if mWearNodesWithApp comes as 0 it shows that app is not installed and if it shows 1 it means application is installed.

CAPABILITY_WEAR_APP should be of String type and should have the value which you mentioned in wear.xml of wear application and not of phone. Do remember to mention the same applicationId for both Phone and Wear application.