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Editorial Team
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Asked: 2026-06-10T23:18:41+00:00

In onSaveInstanceState() : // departures is instance of Departures which extends ArrayList bundle.putSerializable(departures, departures);

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In onSaveInstanceState():

// departures is instance of Departures which extends ArrayList
bundle.putSerializable("departures", departures);

In onRestoreInstanceState:

departures = (Departures) state.getSerializable("departures");

When I rotate the screen, the Activity is restarted and it’s state is restored. It works ok. In case I leave the Activity, after some time Android removes it from memory and saves its state. When I return to it, it crashes in onRestoreInstanceState:

java.lang.ClassCastException: java.util.ArrayList cannot be cast to cz.fhejl.pubtran.Departures

The getSerializable now returned ArrayList, not Departures.

Edit: here’s how Departures.java looks: http://pastebin.com/qc3QfrK7

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1 Answer

  1. Editorial Team

    The problem you see is caused by the way Android flattens the objects. Internally it will call Parcel#writeValue(Object) which has a long chain of if / else and the if (o instanceof List) comes before instanceof Serializable. Since Departures is a List it will put it as a list instead and when unparcelling the data it does not know that it was a special kind of list.

    You need to use something that does not extend a List to get around that problem.

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