Some Activity leaks are not found

[yoavst]

I've got a an activity with barcode scanner. When I exit with finish(), the memory usage stay the same.

So it is probably a memory leak with the context.

[pyricau]

If you used LeakCanary.install(), then in ICS+ any activity that's leaking after being destroyed will be detected. There's no way around it.

However, we sometimes ignore some leaks if they are known Android problems. Can you open logcat and see if a heap dump gets triggered? If yes, then you should at some point see a log indicating the result of the analysis. Please paste it here.

Another explanation could be that something else is leaking, ie not an activity but another set of objects that's using all the memory.

Do you have a sample project that reproduces that systematically?

[yoavst]

Thank you for your explain. Does GC get triggered only if memory is needed, or one per time?

[pyricau]

LeakCanary triggers the GC if an object that should be gone isn't gone yet.

[yoavst]

Because when I trigger gc it free something like 40mb, but GC isn't triggered normally on my app.

[pyricau]

Well then you might not have a memory leak :) . The GC is triggered when there's a need for memory. Because doing a GC is costly, Android tries to limit the number of GC.