A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks

That means you have opened something but never close them.Closable have a method close which you must call to release the resources associated with the component when you no longer need it.

To look for the leak, you can try MAT, I often use it to find memory leaks(static data holding a reference to Activity, etc).

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