Using Data API changes to update watch face UI

Question

I\'m using the Data API in a service for Android Wear in a watch face that pulls down data from the cloud in a phone app and syncs it through a DataMap to the paired watch a

Answer 1

I used a separate service to listen for dataitem changes. From there, I used SharedPreferences to store the data and recall it in my Draw method.

public class DataLayerService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
    SettingsManager sm = new SettingsManager(getApplicationContext()); 
 //This is an interface for SharedPreferences I built for convenience
 DataMap dm = DataMap.fromByteArray(d.getDataItem().getData());
 sm.setString("WP_ICON", dm.getString("Icon"));
}
}

This code basically gets data from a phone and saves it locally.

private class Engine extends CanvasWatchFaceService.Engine {
    @Override
    public void onDraw(Canvas canvas, Rect bounds) {
        Drawable weather = getDrawable(getIcon(sm.getString("WP_ICON")));
        //The getIcon method chooses a Drawable based on the string. 
        //The values are from a set list
   }
}

It's a basic overview of how I did this from the watch side. This works pretty well functionality wise. Without a paired device it won't have any data issues as it's already offline.