Android Question UDP thread

[Hakanunver]

Hii
I want to receive data from UDP . But I get error "android.os.NetworkOnMainThreadException"
I want to use UDP on thread library.
1- This offical library I dont find
2- I need Example How I use UDP_PacketArrived on thread library

Thanks..

 

[lemonisdead]

If you mean the Thread library, it can be found here https://www.b4x.com/android/forum/threads/threading-library.6775/

PS: you don't need to open a poll if you only ask a question

 

[Hakanunver]

Thanks lemonisdead
I edit This poll

But I dont understand How I use UDP_PacketArrived On thread library ?
You have any ideas ?

 

[lemonisdead]

Really, I am not an expert, so please don't take my reply as if it was 100% correct. It is a long time I didn't use any broadcasting method (and threads). But here is how I understood this: the threads are used to make some computation at the same time. When a thread has finished working, it returns to the Main thread (not the Main activity).
So, if I understand it correctly, your UDP receiver is to declare in the Main thread (perhaps in a Service if you want it to be ran all time). After it was initialized, when it receives some packets, the UDP_PacketArrived sub is called. Then, you can start a new thread to make something in the background. If I understand it, you don't have to create a special thread where to declare the UDP receiver.
I hope this can help, a bit

 

[Hakanunver]

1- I need Always Listen the UDP port
2 -when I receive data from udp I have "Android Policy " problem
3 - if I use " DisableStrictMode " freeze after 5 second.

How I fix This Problem ?

Thanks..

 

[lemonisdead]

In short, my replies :
1. you should move the declaration into a service (the Starter service is a good place)
2. I bet you currently have declared in the Main Activity, if it is the case, moving the declaration to a service will solve
3. perhaps could you share some code, because for now, I see no reason. Is DisableStrictMode a method related to the UDPSocket ?

 

[DonManfred]

Is DisableStrictMode a method related to

It is a method related to android apps. If you do network-connections in the main-thread then you run into an network on main thread exception.
DisableStrictMode allows it. But it is not suggested to do network on the main-thread.

I would write a java lib to do the communication and use threads. After the thread is fnished i would raise an event in b4a.

 

[DonManfred]

1- This offical library I dont find
2- I need Example How I use UDP_PacketArrived on thread library

See docu https://www.b4x.com/android/help/network.html
See Network tutorial https://www.b4x.com/android/forum/threads/network-asyncstreams-b4xserializator.72149/#content
Inform about Services

Using AsyncStreams or AsyncStreamText is probably the solution.

https://www.b4x.com/android/forum/t...ceive-objects-instead-of-bytes.30543/#content

https://www.b4x.com/android/forum/t...n-working-with-streams-of-text.27002/#content

 

[Hakanunver]

Hii #DonManfred what you think possible use udp communication asyncstreams or AsyncStreamText ?
Because I need udp. I need listen brodcast messages..

 

[Hakanunver]

Yes Solved UDP problem.
I use in sevice udp . Works no problem

Thanks for All

 

[Erel]

There is no need to do anything special. The UDP library already uses a background thread.

@Hakanunver you should always post the full error message. You most probably used the deprecated Host property instead of HostAddress property. This would have solved your issue.

 

[Hakanunver]

@Erel My problem Not error.. Android Policy Error on main Thread.
After uses service will solved.

 

[Erel]

Your problem happened because you used the deprecated Host property.