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java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

I'm using the support library for my app. In my FragmentActivity I'm using an AsyncTask for downloading data from internet. In the onPreExecute() method I add a Fragment and in the onPostExecute() method I remove it again. When the orientation is changed in between, I get the above mentioned excepti...
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Using Rails 3.1 assets pipeline to conditionally use certain css

I’m in the process of building my first solo Rails app using Rails 3.1.rc5. My problem is that I want to have my site render the various CSS files conditionally. I’m using Blueprint CSS and I’m trying to have sprockets/rails render screen.css most of the time, print.css only when printing,...
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What is the difference between Polymer elements and AngularJS directives?

...rties...We think these things are helpful for building web component-based apps. GREEN: The comprehensive set of UI components (green layer) is still in progress. These will be web components that use all of the red + yellow layers. Angular directives vs. Custom Elements? See Alex Russell's answe...
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How do I resolve a HTTP 414 “Request URI too long” error?

I have developed a PHP web app. I am giving an option to the user to update multiple issues on one go. In doing so, sometimes the user is encountering this error. Is there any way to increase the lenght of URL in apache? ...
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Difference between static STATIC_URL and STATIC_ROOT on Django

...y collectstatic will copy all the static files(ie in static folder in your apps, static files in all paths) to the directory /var/www/example.com/static/. now you only need to serve this directory on apache or nginx..etc. STATIC_URL The URL of which the static files in STATIC_ROOT directory ar...
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Serving static files with Sinatra

...one page website only using HTML, CSS and JavaScript. I want to deploy the app to Heroku, but I cannot find a way to do it. I am now trying to make the app working with Sinatra. ...
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Android Endless List

... want to indicate progress in the last list item (like the market or gmail apps do). share | improve this answer | follow | ...
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RabbitMQ and relationship between channel and connection

...This way you can use as many (virtual) connections as you want inside your application without overloading the broker with TCP connections. You can use one Channel for everything. However, if you have multiple threads, it's suggested to use a different Channel for each thread. Channel thread-safet...
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MVC Vs n-tier architecture

...n MVC(which is an architectural pattern) and an n-tier architecture for an application. I searched for it but couldn't find a simple explanation. May be I am a bit naive on MVC concepts, so if anyone can explain the difference then it would be great. ...
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Xcode Command /usr/bin/codesign failed with exit code 1 : errSecInternalComponent

I am trying to add new provisioning profile to my Xcode, to test an app on the device. Here are the steps I followed: 16 An...