problem with Synchronous call

General
1

Hi

I make a synchronous call. But app crash when called

BackendlessCollection<Events> result = Backendless.Persistence.of(Events.class).find(dataQuery);

the code

StringBuilder whereClause = new StringBuilder();
whereClause.append("startTime>='").append(newMonth-1).append("' and startTime<='").append(newMonth+1).append("'");
BackendlessDataQuery dataQuery = new BackendlessDataQuery();
dataQuery.setWhereClause(whereClause.toString());
BackendlessCollection&lt;Events&gt; result = Backendless.Persistence.of(Events.class).find(dataQuery);

When I call Asynchronous call it is work, but i need synchronous

2

Hello, Amangeldi!

I’ve tried to reproduce this issue, but I couldn’t. Please, tell me, are you trying to run this code from android device?

Alex Navara

3

Hi

Yes in android device

4

Hello!

The problem is that synchronous calls are forbidden by Dalvik when running on device - that’s why you receive error. Use only asynchronous and it would work fine.

best regards,
Alex Navara

5

Another workaround is to use AsyncTask: http://stackoverflow.com/a/6343299/1813669

6

Thank you

7

And what is the solution for this? I also want to make a sync call but I cant, only with async is working. What do I need to do in order to work with sync calls?

Thank you in advance.

8

If you create a new thread, you will be able to make sync calls in it. If you make a sync call in the UI thread, you will get an exception for the reason that network communication is not allowed on the main UI thread.

Regards,
Mark

9

Thank you. I didnt know that. Im starting to develop on Android so your comment was very important. Thank you again.