During the development of FCM (Firebase Cloud Messaging), I needed logic to determine whether the app was running or not. The problem was that distinguishing the app's execution state proved to be quite tricky from my perspective.
So, I created the following code to make state checks relatively easy. I thought there might be others who face similar considerations, so I'm sharing it.
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| android activity stack check |
In the class that inherits from Application, you can write as shown above in the onCreate method.
If activityStackCnt > 0, it's foreground,
If activityStackCnt == 0, it's background,
This is how you can distinguish it.
In fact, I designed it with the thought that if the app is properly closed by pressing the back button, the count would become negative, resulting in activityStackCnt == 0. However, because the statically declared activityStackCnt is initialized with the default value of 0 for an int, it worked (by chance?) even when the memory was cleared by killing the task from any screen.
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