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Android ListView – Tutorial and basic example

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One of the UI component we use often is ListView, for example when we need to show items in a vertical scrolling list. One interesting aspect is this component can be deeply customized and can be adapted to our needs. In this first post i want to analyze the basic concepts behind it and how to use this component. In ...

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Singleton Design Pattern – A Lion’s Eye View

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A few days ago when I was in my home town, one of my sub-juniors from my colleague attended an interview in an MNC and was severely injured in that interview process. I mean he could not qualify the interview because of the difficult questions fired by the interview panel. When I came back to Bangalore, he shared the embarrassing ...

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Spring MVC: Validator and @InitBinder

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It’s hard to imagine a web-application which doesn’t has some validation logic for an user data. Almost all user’s data has some constraints, e.g. date of birth should consist of day, month, year etc. Spring MVC has its own solution for the data validation, and it’s become available with the help of Validator interface. Usage of Spring MVC Validator A ...

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Android: Build real weather app: JSON, HTTP and Openweathermap

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In this post I want to describe how to create a weather app that gives current weather information. This app will use JSON, HTTP connection and AsyncTask to get this information.. As weather provider I will use OpenWeatherMap a free weather service that provides some interesting API really easy to use.I will guide you through the steps necessary to build ...

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Searchable documents? Yes You Can. Another reason to choose AsciiDoc

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Elasticsearch is a flexible and powerful open source, distributed real-time search and analytics engine for the cloud based on Apache Lucene which provides full text search capabilities. It is document oriented and schema free. Asciidoctor is a pure Ruby processor for converting AsciiDoc source files and strings into HTML 5, DocBook 4.5 and other formats. Apart of Asciidoctor Ruby part, ...

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GlassFish 4 brings Java EE 7

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What a surprise. Apple had nothing to offer at wwdc except the new iOS 7 launch. Might be coincidence that shortly after their keynote another 7 made an official appearance. GlassFish 4.0 was release yesterday evening (obviously unwanted). The new Java EE 7 reference implementation automatically is the first Java EE 7 application server available today. New Website  After 89 promoted ...

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Android Fragment transaction: FragmentManager and Backstack

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Fragments are useful when we want to support multiple screen size. To manage fragments we need a FragmentManager that help us to handle trasaction between fragments. With transaction we mean a sequence of steps to add, replace or remove fragments. In the last post we showed how to support multiple screen size and orientation using fragments. Now we want to go a ...

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Guava’s EventBus – Simple Publisher/Subscriber

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Looking over recent additions to Google’s Guava Libraries Release 10 I noticed the addition of EventBus. This is a lightweight implementation of a publish-subscribe style messaging system. This is similar to the publish-subscribe model provided by JMS, however the messages remain within the application rather than being broadcast externally. EventBus allows you to create streams within your program to which ...

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