StackOverflow2013

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PO
primarykey
Id
12313049
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-09-07T06:43:19.253
FavoriteCount
0
LastActivityDate
2012-09-07T06:51:53.783
LastEditDate
2012-09-07T06:51:53.783
LastEditorUserId
165674
OwnerUserId
165674
ParentId
12312926
PostTypeId
2
Score
17
ViewCount
0
LastEditorDisplayName
text
Body
<a href="http://developer.android.com/reference/android/view/View.html" rel="noreferrer">From the documentation of <code>View</code></a>: <blockquote> You must always be on the UI thread when calling any method on any view. If you are doing work on other threads and want to update the state of a view from that thread, you should use a <code>Handler</code>. </blockquote> In your example, when you've to call the <code>dismiss()</code> method on the <code>ProgressDialog</code>, as per the above documentation, you must do so from the UI thread. The <code>messageHandler</code> is initialized to an instance of a <code>Handler</code> when the <code>HandlerThread</code> class is instantiated (presumably on the UI thread). <a href="http://developer.android.com/reference/android/os/Handler.html" rel="noreferrer">From the documentation of <code>Handler</code></a>: <blockquote> Each <code>Handler</code> instance is associated with a single thread and that thread's message queue. When you create a new <code>Handler</code>, it is bound to the thread / message queue of the thread that is creating it -- from that point on, it will deliver messages and runnables to that message queue and execute them as they come out of the message queue. </blockquote> So to communicate with the UI thread from your new thread, just post a message to the <code>Handler</code> created on the UI thread. If you call methods on a <code>View</code> from outside the UI thread, it invokes undefined behaviour, which means, it may appear to work fine. But it's not always guaranteed to work fine.
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1. POWhy use Handler?
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1. USDheeraj V.S.
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1. USDheeraj V.S.
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