android - How do I obtain data from Firebase database without an event being triggered? -

-

i'm creating app school project , have issues getting data firebase database. have data stored in database need retrieve. however, in guide seem find information on how data when event triggered. want data retrieved automatically e.g. when open homescreen of app or when scroll down window update homescreen.

it possible there explanation in guide, if so, have not been able grasp it. thorough description of solution appreciated!

regards, andreas

due asynchronous nature of firebase possible way retrieve data.

when make request firebase, data isn't instantly available. when data becomes available, firebase trigger event , pass data. unfortunately there no way around this.

people deal showing sort of activity indicator until data has been retrieved.

i hope answers question!


Comments

Post a Comment

Popular posts from this blog

javascript - Laravel datatable invalid JSON response -

-
everything work fine on code below fetch user logs: js: <script> $(document).ready(function () { var table =$('#systemlogs').datatable({ responsive: true, processing: true, serverside: true, "language": { "url": "/datatables/media/plug-in/persian.json" }, ajax: '{!! url('/admin/systemlogs/data/systemlogsdatatable') !!}', columns: [ { data: 'name', name: 'name' }, { data: 'message_text', name: 'message_text' }, { data: 'remote_addr', name: 'remote_addr' }, { data: 'log_created_at', name: 'management_logs.created_at' }, { data: 'log_updated_at', name: 'management_logs.updated_at' }, ] }); }); </script> routes: route::get('/systemlogs/data/systemlogsdatatable','systemlogscontrolle...
Read more

java - Exception in thread "main" org.springframework.context.ApplicationContextException: Unable to start embedded container; -

-
i getting error when run spring application: exception in thread "main" org.springframework.context.applicationcontextexception: unable start embedded container; nested exception org.springframework.context.applicationcontextexception: unable start embeddedwebapplicationcontext due missing embeddedservletcontainerfactory bean. @ org.springframework.boot.context.embedded.embeddedwebapplicationcontext.onrefresh(embeddedwebapplicationcontext.java:124) @ org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:476) @ org.springframework.boot.context.embedded.embeddedwebapplicationcontext.refresh(embeddedwebapplicationcontext.java:109) @ org.springframework.boot.springapplication.refresh(springapplication.java:691) @ org.springframework.boot.springapplication.run(springapplication.java:320) @ org.springframework.boot.springapplication.run(springapplication.java:952) @ org.springframework.boot.springa...
Read more

sql server 2008 - My Sql Code Get An Error Of Msg 245, Level 16, State 1, Line 1 Conversion failed when converting the varchar value '8:45 AM' to data type int -

-
msg 245, level 16, state 1, line 1 conversion failed when converting varchar value '8:45 am' data type int. script declare @specimenid bigint = 0, @script varchar(max); declare @starttime int = (select convert(int,substring(start_time,0,charindex(':', start_time)) - 12) appt appt._id=112601) --select @starttime set @script = 'select distinct ptlast_name + '', '' + pt.first_name patient_name, dbo.formatdate(pt.dob,''mm/dd/yyyy'') dob, (convert(varchar, (datediff(yy, dob, appt_date) - case when (month(dob) > month(appt_date)) or (month(dob) = month(appt_date) , day(dob) > day(appt_date)) 1 else 0 end)) + ''/'' + convert(varchar, (datediff(m, dateadd(yy, (datediff(yy, dob, appt_date) - case when (month(dob) > month(appt_date)) or (month(dob) = month(appt_date) , day(dob) > day(appt_date)) 1 else 0 end), d...
Read more