Android Firebase, simply get one child object's data -


i have been looking way 1 child object's data in android firebase.

i have found things firebase retrieve child android. solutions suggesting using "childeventlistener", need data @ moment, not when moved, deleted, updated, etcetera.

my data kept in https://.firebaseio.com/users//creation string. figure there must simple way access without needing much, because if copy exact url browser, can see the: 'creation: "2015/05/31 21:33:55"' right there in "firebase forge dashboard".

if knows how access without listener change appreciated!

thank you!

firebase listeners fire both initial data , changes.

if you're looking synchronize data in collection, use childeventlistener. if you're looking synchronize single object, use valueeventlistener. note in both cases you're not "getting" data. you're synchronizing it, means callback may invoked multiple times: initial data , whenever data gets updated.

this covered in firebase's quickstart guide android. relevant code , quote:

firebaseref.child("message").addvalueeventlistener(new valueeventlistener() {   @override   public void ondatachange(datasnapshot snapshot) {     system.out.println(snapshot.getvalue());  //prints "do have data? you'll love firebase."   }   @override   public void oncancelled(databaseerror databaseerror) {           } });

in example above, value event fire once initial state of data, , again every time value of data changes.

please spend few moments go through quick start. shouldn't take more 15 minutes , save lot of head scratching , questions. firebase android guide next destination, question specifically: https://firebase.google.com/docs/database/android/read-and-write


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more