Android Question B4Xpages. How do I handle when the OS pauses it?

[jimseng]

Hello. I have a simple socket client connecting to a RPi with a socket listening in a Python script. When I leave my phone alone, eventually the socket disconnects (I log it in the Python script). This is not the same as the screen turning off. I'm unsure what is happening in my B4Xpages app at that moment and how I can tell if I have been disconnected or not. It's just so I can show the appropriate re-connect page when the app resumes. Where do I log the "event" so I can take appropriate action when I wake the phone up some time later?

 

[agraham]

You can try using the KeyValueStore internal library to save state between app invocations.

 

[Erel]

Are you using AsyncStreams? You need to handle the Terminated and Error events.

Note that the app itself is never paused with B4XPages.

 

[jimseng]

I am using AsyncStreams. What I am trying to understand is that after a few minutes my Python script detects that the socket ends and I reset it ready for another connection. I want to know if there is an Android event that triggers that termination. I am using B4XPage_Background as a guess but are you saying the Terminated and or Error events are the correct way?

 

[teddybear]

I am using AsyncStreams. What I am trying to understand is that after a few minutes my Python script detects that the socket ends and I reset it ready for another connection. I want to know if there is an Android event that triggers that termination. I am using B4XPage_Background as a guess but are you saying the Terminated and or Error events are the correct way?

As Erel said in post #3, you can set a socket disconnected state in the Terminated and Error events. so that you can show the appropriate re-connect page when the app resumes

 

[Erel]

I am using B4XPage_Background as a guess but are you saying the Terminated and or Error events are the correct way?

True. With B4XPages you can ignore the background event. The Error / Terminated events are the important events.