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POMemory leak: Confusion between Java Garbage Collector - and Android killing mechanism?
 

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  1. POMemory leak: Confusion between Java Garbage Collector - and Android killing mechanism?
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    <p>I am newbie to both Java and Android, and currently I am confused about "memory leak" in Android, for example: I have 01 Class, 01 Activity and 01 Interface as following:</p> <p>Class BackGroundWorker is a singleton, which lives as long as the application lives:</p> <pre><code>public class BackGroundWorker { private IOnEventOccurListener listener = null; private static BackGroundWorker instance; // .... public void setListener(IOnEventOccurListener pListener) { this.listener = pListener; } // .... public static BackGroundWorker getInstance() { //... return instance; } } </code></pre> <p>The Listener Interface:</p> <pre><code>public interface IOnEventOccurListener { public void onEventOccur(); } </code></pre> <p>And the Listener itself (An activity):</p> <pre><code>public class ShowSomething extends Activity implements IOnEventOccurListener{ BackGroundWorker bgWorker; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); bgWorker = BackGroundWorker.getInstance(); bgWorker.setListener(this); } @Override public void onEventOccur() { // TODO do something } } </code></pre> <p>Now, according to what Romain Guy mentioned <a href="http://android-developers.blogspot.com/2009/01/avoiding-memory-leaks.html" rel="nofollow">here</a>: It’s a memory leak, because there’s a reference to the listener (Activity). So Java GC cannot collect the Activity, even when it’s not in use. </p> <p>I was able to solve that problem by WeakReference – but still wonder: <strong>In this case, when the device needs more memory, according to Android Dev document, it will “kill” the activity if needed - assuming that the Activity ShowSomething is “killed” – then what happens ? (It’s still leak according to Romain Guy, and still “killed” )</strong> </p> <p>I am really confused. Could anybody please explain this ?</p> <p>Thank you in advanced,<br> Son</p>
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