StackOverflow2013

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PO
primarykey
Id
13508304
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0
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0
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0
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CreationDate
2012-11-22T08:11:01.747
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0
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2012-11-22T08:34:00.207
LastEditDate
2012-11-22T08:34:00.207
LastEditorUserId
1163019
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1163019
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13507208
PostTypeId
2
Score
2
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0
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text
Body
From <a href="http://tools.android.com/tips/lint-checks" rel="nofollow">Android lint checks</a>: <pre> HandlerLeak ----------- Summary: Ensures that Handler classes do not hold on to a reference to an outer class Priority: 4 / 10 Severity: Warning Category: Performance In Android, Handler classes should be static or leaks might occur. Messages enqueued on the application thread's MessageQueue also retain their target Handler. If the Handler is an inner class, its outer class will be retained as well. To avoid leaking the outer class, declare the Handler as a static nested class with a WeakReference to its outer class. </pre> First part of the warning is because <code>final Handler handler = new Handler()</code> creates an anonymous inner class. Inner classes can't be created in a standalone fashion, you always need an outer instance. Remember how you would create this in Java <code>OuterClass.InnerClass innerObject = outerObject.new InnerClass();</code>. Every inner class object also has to keep a reference to outer object <code>Outer.this</code> to access outer's members. Second part is <code>final Message message = handler.obtainMessage( 1, MyFunction( context));</code> has a handle to your inner handler class (which has a handler to outer Activity class). If this message lives long enough, it won't be possible to garbage collect your Activity. What can block your message being processed? Unfortunately lint tool can't figure that out, so it always warns you about possible memory leak. If you are sure about what you are doing, you can suppress these messages by <a href="http://tools.android.com/recent/ignoringlintwarnings" rel="nofollow">various methods</a>. For your case it doesn't look like a good idea to make <code>Activity</code> a <code>Runnable</code> but anyway may be you should use <a href="http://developer.android.com/reference/android/os/Handler.html#post%28java.lang.Runnable%29" rel="nofollow">Handler.post</a> or best <a href="http://developer.android.com/reference/android/app/Activity.html#runOnUiThread%28java.lang.Runnable%29" rel="nofollow">Activity.runOnUIThread</a>.
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1. POThis Handler class should be static or leaks might occur: final Handler
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