UI not working properly after system killed app - android

My app uses a pagerTabStrip with fragments. When the app goes to background and other memory intensive tasks run in foreground, the app will be killed. Then, if I recall the app, the fragments buttons onclick methods dont fire anymore. (side note: the color of the buttons is then wrong too, but the "visual click" down->up is working)
It is working fine when I manually kill the app or when it's just short term via onPause/onResume in background. It seems that in this system-kill-case sort of image of the app is taken and reloaded (incorrect).
If there is no direct way to fix this, I would like to catch this event, to just recreate the whole fragment, but I can't. I tried onTrimMemory and investigated the call order of onStop/onDestroy/onRestart ... but I couldnt figure out, when this "special kill" happens.
Thank you!

Got it.
First, to reproduce the issue, just launch the app, send to background and then hit the red circle-cross at the left pane of the logcat output frame in android studio as described here:
https://medium.com/inloopx/android-process-kill-and-the-big-implications-for-your-app-1ecbed4921cb
My workaround is to save the processID in onSaveInstanceState and to check if this changed in onCreate as described here:
https://stackoverflow.com/a/47483856/6053524
If so, the app has been killed by system and my issues of not proper working UI occured. To fix this I load the initial Activity via new Intent/startActivity to get a clean new application.

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According to the android documentation (https://developer.android.com/guide/components/activities/background-starts) this shouldn´t even be "possible" anymore. I checked many posts already but they all seem too old or say this isn´t really feasible or easily doable anymore. But still, there are apps doing this today like (StayFree for example). I want to start the activity with a running service that checks data in the background.
What I would like to know or I think is needed:
Permission like display over other apps (Something like ACTION_MANAGE_OVERLAY_PERMISSION)
A service for which is running in the background while the app is not open and starts the activity from the background.
Attention: I want the overlay/activity to be a normal activity and not a system alert window.
I tried many things but I am still mainly a C# Dev so help I would appreciate your help thanks!

Wrong stack behavior on first application run (before restart)

I am trying to understand some behavior of the android apps, now that I faced the following issue :
After device restart my app launches by default, but with one issue : If I put it in the background, and I try to resume it from HOME launcher, it restarts from splash
Weird is that this happens ONLY & ONLY after the device it was installed on, is restarted ! To break this behavior I have to kill the app and launch it again. From that point it works as expected -> If in background, using launcher icon restore the app state
Looking a bit in the logs from lifecycles of the activities in cause, I noticed that the flow is pretty much the same ! With the difference that after onResume of last active activity, the SplashScreen gets launched (this being LAUNCHER activity)
Now, I've seen that this might be already an issue reported to Google, even multiple times, but .. If I cannot fix or workaround it, I am at least trying to understand the flow of what happens on these cases.
Edit:
Seems to be related to FLAG_ACTIVITY_NEW_TASK set in the Receiver, but.. then again I cannot start the app after boot is completed without this flag! Feels like a cycle I can't get out of..

Titanium APP (Android) crashes when brought alive from background

From the beginning of the APP development, I found that if I re launch the APP, the APP crashes and nothing gets displayed. I think it has something to do with the resource that is assigned to the APP and it trying to restore its previous state and it is failing to do so.
I see that, in many APPs, when it re launches the view is reset to its first screen. I would like to do the same in my APP.
Any suggestions on how I should be handling this ?
clear up memory ?
attach an event before-close and on-launch (or on-relaunch) ?
reset APP view to home screen ?
This is the first APP I am building (happens to be in Titanium). Therefore my fundamentals of APP development are weak.
Any help would be greatly appreciated.
I'm not sure what you are doing in your app, but I'm not seeing that in my Titanium apps. My users probably leave my app running/paused for days and then resume them as needed. Until their device runs out of juice, I'm pretty sure they never restart my app. Perhaps a module you are using?
There are events you can handle that will allow you to take an action when the app is put paused and when it is resumed. You can write your code to reset the app to the starting screen, which I'm partial to that idea as well. I'm not aware of a call you can make that will essentially restart your app.
The events you can handle.
Ti.App.addEventListener('pause', _.bind(this.exit, this));
Ti.App.addEventListener('close', _.bind(this.exit, this));
Ti.App.addEventListener('resume', _.bind(this.resume, this));
You would have to write the action taken when these events happen.
Code is from the https://github.com/appcelerator/Field-Service-App. This app has the hooks, but doesn't implement any actions for them. Check out the alloy.js file.

Android- Application Settings Force Stop

I didn't use any services in my application and closing the application by using
this.finish();
but my application still not stopped properly and it is running in background.when i go to application settings the force stop button is still enabled.
kindly share your views on proper exit of android application.
It's quite possible you have another activity around.
From the Android docs, see Activity.finish():
Call this when your activity is done and should be closed. The
ActivityResult is propagated back to whoever launched you via
onActivityResult().
There's no promise made that the activity will be closed right away on calling finish(), only that this is something that should be done. Usually this does happen right away, but without seeing your project I cannot comment further.
Note that Android, unlike iOS, doesn't really have a well-defined notion of an app. "Apps" can share activities and so on. For example it's not hard, but it's also non-trivial, for an "app" to know that it will go to background or that it has resumed.

How to force all activities in an application to always be destroyed (for testing purposes)?

I am basically looking for the same functionality found in the DevTools (Development.apk) app that comes with the emulator. I am wanting to perform similar testing on an actual device but the DevTools app does not work properly on the device I have so I cannot use it.
I am looking to test in a similar way.
What this does is causes each Activity to be destroyed whenever it leaves the screen, holding onto its instance state just as if the system needed resources and had killed it. (So I can't just call finish)
Is there a way to do this?
Thanks
You can kill your app's process at any time using the DDMS stop button. highlight your application in the list and click the stop sign button. your application will be destroyed like it was killed by the system.
See the stop button in the left pane(Devices) above each device listing:

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