Application stops automatically if not used ?

[jnbarban]

Hi everyone, i need help...

My context :
I have developped a big application. This application is deployed on samsung galaxy tab 1 or galaxy tab 2 and she is used by almost 150 persons.

The probleme :
Many of users tell me that if ,when he use the application, he let the galaxy tab for a momments on inactivity (screen shutdown, or "home" button in order to make something else with the galaxy tab...), When he restart the application, she start like at first time. Users have lost all that he has done on the activity of the application before the inactivity periode.

My question :
Why the application was shutdown if user doesn't exit the application?


I hope you understood my probleme and anyone help me to let my application active if i didnt choose to exit the application.

thanks

 

[Erel]

This is how Android works. You, the developer, is responsible for saving the state when the activity is paused.

See StateManager for one possible solution:
Basic4android Search: StateManager

 

[jnbarban]

Thanks Erel. But i can't use StateManager in order to fix my probleme.

I Hope this small scheme can explain what is my probleme:

When users are on "Activity 1 Bis" and the application was put in pause (screen shutdown, home button...)

- sometimes, the application resume on "Activity 1 bis" --> Nothing have change , it's that i want.

- But sometimes, the application restart on "Main" --> all are lost : to bad for users


I read StateManager function ( really good function ) but don't thinks that fix my probleme, the context can't be the same as before the activity pause. (Data base connection, sql request result...)

Do you know what i mean ?

 

[Erel]

You should go over this tutorial:
Android Process and activities life cycle

You should build your program in such way that it saves the state and can later full restore it.

You can also force the OS to keep your application running by creating a service and calling Service.StartForeground.

 

[jnbarban]

Thanks Erel, i'm going to try your second solution ( Service module)...

 

[mc73]

You should rebuild the UI every time, that's the obvious unfortunately. Apart from the stateManager, I tend to use flags informing my app to which exact activity the 'pause' happened and return there, forcing it to rebuild the UI based on saved variables received. You are using listBoxes, that's fine, as long as you save their data to a temporary area, be it a map, or even a temporary sql table.

 

[jnbarban]

Just for information, seems to be ok with a service module..
thanks