Android FMX Game App not working reliably

[Len Yates 0]

I was able to use Firemonkey to develop a multi-platform game, specifically for Android at first.  After thoroughly debugging the app when running in Windows, I then deployed it in my Android tablet, and there were several problems, especially with regard to drag-and-drop, plus images that would remain on the screen when they should have disappeared.  These problems were intermittent -- difficult to re-produce reliably.  Nevertheless, I spent many hours trying every little trick I could think of in terms of structuring the code (e.g. different ways of trying to make a glyph disappear), but still could not get the functionality to where it needed to be.  I was using Android 32-bit - Android SDK 25.2.5.  Again, this app would run consistently and perfectly when running the Windows version!  Unfortunately, I'll have to give up on this project unless someone has a bright idea.

[Rollo62 536]

I would say this depends highly on what you want to achive.
Pure visual stuff usually works nice, but FMX is not made for game development.

 

I think the approach Windows-first was not a good idea, better start Mobile-first, and then use Windows for testing.

 

What I would recommend is to modularize as much as possible, and try each little piece on Android,

putting all together step-by-step, and well tested.

I know this is not an easy way and maybe the problem lies somewhere else, but without any info the best thought I could get.

Edited April 15, 2020 by Rollo62

[vfbb 285]

You may be manipulating images without checking the scale of the screen. Because in Windows the scale is usually 1 so there are no problems. Try on your windows to adjust the scale to 150% and test your program.

I have a delphi crossplataform app that works perfectly on Windows, iOS and Android. It is not a game but have some cool animations that execute with 60fps without any choking and is more fast then the most of the apps that I have on my phone.

Edited April 15, 2020 by vfbb

[vfbb 285]

Other possibility: Are you using threads/tasks for draw bitmaps? Or for change the UI?

[Len Yates 0]

The main thread is my only thread.  

 

To Rollo62: Since I am using Delphi on a Windows system, it is only natural to get a program working in Windows first, and then to try attaching an Android device and trying the program in there, with debugging or without.  

[Lars Fosdal 1792]

Also, monitor your memory consumption in the Windows App. If it is not stable but keeps growing - there is a chance that you have a leak.