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Android update activity UI from service

...or new task all the time. If there is new task, I want to refresh the activity UI to show that info. I did find https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/ this example. Is that a good approch ? Any other examples? ...
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Verify a certificate chain using openssl verify

I'm building a own certificate chain with following componenents: 7 Answers 7 ...
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Better way to check if a Path is a File or a Directory?

I am processing a TreeView of directories and files. A user can select either a file or a directory and then do something with it. This requires me to have a method which performs different actions based on the user's selection. ...
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Do I need a content-type header for HTTP GET requests?

... sender. If a Content-Type header field is not present, the recipient MAY either assume a media type of "application/octet-stream" ([RFC2046], Section 4.5.1) or examine the data to determine its type. It means that the Content-Type HTTP header should be set only for PUT and POST requests. ...
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How to link a Facebook app with an existing fan page

... landing pages for apps , how do I get my app to point to the Fan page for it's landing page? 7 Answers ...
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css3 transition animation on load?

Is it possible to use CSS3 transition animation on page load without using Javascript? 11 Answers ...
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What is the role of the bias in neural networks? [closed]

I'm aware of the gradient descent and the back-propagation algorithm. What I don't get is: when is using a bias important and how do you use it? ...
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What is android:weightSum in android, and how does it work?

...as the sum of the layout_weight of all the children if not specified explicitly. Let's consider an example with a LinearLayout with horizontal orientation and 3 ImageViews inside it. Now we want these ImageViews always to take equal space. To acheive this, you can set the layout_weight of each Imag...
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Open document with default OS application in Python, both in Windows and Mac OS

I need to be able to open a document using its default application in Windows and Mac OS. Basically, I want to do the same thing that happens when you double-click on the document icon in Explorer or Finder. What is the best way to do this in Python? ...
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JPA getSingleResult() or null

I have an insertOrUpdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an ex...