Activity OnDestroy never called?

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onDestroy() is called only when system is low on resources(memory, cpu time and so on) and makes a decision to kill your activity/application or when somebody calls finish() on your activity.

So, to test your code() you can make a test button, that will call finish() on your activity.

Read more here.

Also, I believe you don’t need to call all this stuff in onDestroy() until adap is not a critical resource. And even in that case android system has mechanisms to properly dispose them.

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