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Editorial Team
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Asked: 2026-05-20T12:42:57+00:00

I know I can use isFinishing() in onPause() to know whether an activity is

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I know I can use isFinishing() in onPause() to know whether an activity is going to be killed by finish().

Then, how can I know an activity is going to be killed by OS temporarily due to low memory?

Thanks.

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1 Answer

  1. Editorial Team

    Per the docs, onDestroy should be called right before the Activity is destroyed, regardless of the reason. If the finish was requested, isFinishing will return true. So if it is false, you can assume that the system needed to finish.

    However, as the docs also say

    Note: do not count on this method
    being called as a place for saving
    data!

    In general, you cannot guarantee that your Activity will be killed nicely. Things like task killers mess with the lifecycle.

    Use onPause or onSaveInstanceState to save things properly.

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