Android Question Long process in background, best practice

[SDFP Studio]

Hello,
I have a long process (audio decoding) which can take 30 or more seconds to execute, it is inline java code.
When i call my function it freeze app during execution (so 30 or more seconds).
Is there a solution to do that in background.
Tried thread.RunOnGuiThread but does not execute in background, it freeze app, maybe i don't use it as i should.
Tried thread.start but nothing happens.
If i understand, Erel seems to say that we should not use threads but resumable subs.
So what can i do in such a case ?

Thank you

 

[sfsameer]

Hello,
I have a long process (audio decoding) which can take 30 or more seconds to execute, it is inline java code.
When i call my function it freeze app during execution (so 30 or more seconds).
Is there a solution to do that in background.
Tried thread.RunOnGuiThread but does not execute in background, it freeze app, maybe i don't use it as i should.
Tried thread.start but nothing happens.
If i understand, Erel seems to say that we should not use threads but resumable subs.
So what can i do in such a case ?

Thank you

Try the below solution :

[java] Libraries and multithreading

In order to keep Basic4android simple for developers, Basic4android code runs under the main UI thread. Internally Basic4android has good support for multithreading. Libraries developers are responsible for understanding and using the internal framework correctly. Android shows the...

www.b4x.com

This is to run the java codes Async meaning a multi thread which will not effect the GUI

 

[Erel]

I have a long process (audio decoding) which can take 30 or more seconds to execute, it is inline java code.

Can you post the code? What is it doing that takes so long?

 

[SDFP Studio]

I use MediaExtractor and MediaCodec to extract the decoded audio from the audio or video, do some calculations and write it to a file.
Media are 3 minutes to 1 hour long, so it takes time.

I started reading your post Libraries and multithreading but it is 'high level' for me so i'm studying it.

Thanks to you and sfsameer for your help.

 

[Erel]

Which step is the slow one? The calcuations you are doing?

As it is done with inline Java, you do need to use runAsync. Example: https://www.b4x.com/android/forum/threads/advertising-id.101050/#content

 

[SDFP Studio]

The calculation is very simple, it is an average of the audio samples but:
for 1 min of 44.1 KHz stereo audio, there are 44100 * 2 tracks + 2 bytes (16bits audio) * 60s = 10,584,000 bytes,
then i'm writing to a file (far less data) so i'm not surprised it takes a long time.

I use runAsync and and it's magic, works fine in the background with no effect on the UI, it's perfect

Thank you