synchronization - Android Wearable: how to get a current variable using DataApi? -

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this event-based code

    wearable.dataapi.addlistener(googleapiclient, new dataapi.datalistener() {         @override         public void ondatachanged(dataeventbuffer dataevents) {             log.i(tag, "on data changed " + dataevents.tostring());             (dataevent event : dataevents) {                 dataitem item = event.getdataitem();                 string path = item.geturi().getpath();                 if (path.equals(path_map)) {                     datamap datamap = datamapitem.fromdataitem(item).getdatamap();                     string datavalue = datamap.getstring(key_data);                 }             }         }     }).setresultcallback(new resultcallbacks<status>() {         @override         public void onsuccess(@nonnull status status) {             log.i(tag, "success");         }          @override         public void onfailure(@nonnull status status) {             log.i(tag, "failure");         }     });

how read datavalue associated key_data without using listener pattern? need because nodes not synced if urgent mode has been set. in particular ondatachanged callback called if there change of values.

this scenario: mobile apk has been installed, @ startup writes value on key_data item. after wearable apk installation set listener receive value data changed event not called, need way current value explicit polling.

i know there messageapi problem same, if device not online message lost.

you can retrieve previous values dataapi using 1 of getdataitems methods documented here: https://developers.google.com/android/reference/com/google/android/gms/wearable/dataapi.html

there various forms depending on filtering you'd api before returning data you. simplest form looks this:

wearable.dataapi.getdataitems(googleapiclient).setresultcallback(new resultcallback<dataitembuffer>() {     @override     public void onresult(@nonnull dataitembuffer buffer) {         (dataitem item : buffer) {             if (item.geturi().getpath().equals(path_map)) {                datamap datamap = datamapitem.fromdataitem(item).getdatamap();                string datavalue = datamap.getstring(key_data);              }          }      }  });

and return dataitems app has sent api. can access key_data value outlined above.


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