The document describes the 'wherewhat' concept, a wearable technology that allows users to quickly locate amenities retrieved from the OpenStreetMap database. It provides details about node elements, query responses, and the libraries used for development, including Dagger and Google Play services. Additionally, it shares lessons learned during the development process, such as challenges with WiFi, Bluetooth, and emulator crashes.

1. WhereWhat
Find amenities with your wearable

2. Concept description
“WhereWhat - Find amenities retrieved from the
OpenStreetMap database with your wearable -
fast and easy navigation at your fingertip”

3. OpenStreetMap / Overpass-Turbo query
[out:json]
;
node
(around:600,52.516667,13.383333)
["amenity"="post_box"];
out qt 13;
Overpass QL

4. OpenStreetMap / Overpass-Turbo response
{
"version": 0.6,
"generator": "Overpass API",
"osm3s": { /* ... */ },
"elements": [
{
"type": "node",
"id": 2194034324,
"lat": 52.5463884,
"lon": 13.3523559,
"tags": {
"addr:city": "Berlin",
"addr:country": "DE",
"addr:housenumber": "12",
"addr:postcode": "13353",
"addr:street": "Ostenderstraße",
"amenity": "post_box",
"collection_times": "Mo-Fr 16:15; Sa 12:00",
"lastcheck": "2015-02-16",
"operator": "Deutsche Post",
"postal_code": "13353",
"ref": "Ostenderstraße 12, 13353 Berlin"
}
},
{ /* ... */ }
]
}

5. OpenStreetMap Java library
https://github.com/johnjohndoe/Overpass
featuring:
- Retrofit
- Moshi
- OkHttp
- JUnit
- AssertJ

6. WhereWhat / Screenshots

7. Build-in feature types
- WLAN
- Library
- Cafe
- Cinema
- Postbox
- Bicycle parking
- Trash can
- Bus
- Bank

8. Extensibility
public List<FeatureType> get() {
return new ArrayList<FeatureType>() {
{
add(new FeatureType(new HashMap<String, String>() {{
put("internet_access", "wlan");
}}, R.drawable.ic_action_wifi, R.string.wifi));
add(new FeatureType("post_box", R.drawable.ic_action_mail, R.string.mailbox));
// Add more feature types here
// ...
}
}
What are you interested in?

9. Libraries used
apt 'com.google.dagger:dagger-compiler:2.0.2 '
compile 'com.google.dagger:dagger:2.0.2 '
compile 'com.android.support:support-annotations:23.1.1 '
compile 'com.google.android.support:wearable:1.3.0 '
compile 'com.google.android.gms:play-services-location:8.3.0 '
compile 'com.google.android.gms:play-services-maps:8.3.0 '
compile 'com.google.android.gms:play-services-wearable:8.3.0 '
compile 'com.github.johnjohndoe:Overpass:2ee1603696f5346abe05d8ec3cb2261bfa4ac423 '
compile 'com.jakewharton:butterknife:7.0.1 '
compile 'com.squareup.okhttp:okhttp:2.6.0 '
compile 'com.squareup.okhttp:logging-interceptor:2.6.0 '
compile 'com.squareup.moshi:moshi:1.0.0 '
compile 'org.ligi:AXT:0.35 '
provided 'org.glassfish:javax.annotation:10.0-b28 '
testCompile ' junit:junit:4.12 '
testCompile ' com.squareup.assertj:assertj-android:1.1.1 '
testCompile ' com.android.support:support-annotations:23.1.1 '

10. Lessons learned
- WiFi vs. Bluetooth
- Watch + handheld vs. Android Virtual Device
- Wearable Data Layer API
- Wear emulator goes offline
- Wear emulator API level 23 crashes when working with ADB

11. Live demo
What could possibly go wrong ...

12. WhereWhat
Sources: https://github.com/ligi/WhereWhat
by Ligi & Tobi
November 26-28, 2015