Download Building Hybrid Android Apps with Java and JavaScript: by Nizamettin Gok, Nitin Khanna PDF

By Nizamettin Gok, Nitin Khanna

Construct HTML5-based hybrid functions for Android with a mixture of local Java and JavaScript elements, with out utilizing third-party libraries and wrappers resembling PhoneGap or Titanium. This concise, hands-on e-book takes you thru the whole procedure, from constructing your improvement setting to deploying your product to an app store.

Learn find out how to create apps that experience entry to local APIs, comparable to situation, vibrator, sensors, and the digicam, utilizing a JavaScript/Java bridge—and opt for the language that offers you larger functionality for every activity. in case you have event with HTML5 and JavaScript, you’ll quick realize why hybrid app improvement is the wave of the future.

* manage a improvement surroundings with HTML, CSS, and JavaScript tools
* Create your first hybrid Android venture, utilizing Eclipse IDE
* Use the WebView keep watch over to host your hybrid application
* discover hybrid software structure, together with JavaScript/Java communication
* construct single-page functions, utilizing JavaScript libraries resembling spine and Underscore
* Get optimization advice and invaluable snippets for CSS, DOM, and JavaScript
* Distribute your software to Google Play and the Amazon Appstore

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But any time users notice any of this, and most especially if it gets in their way, your code has probably intruded on their experience. There is a very fine line between a whiz-bang feature that your users will feel empowers them and an annoying feature that they dread. Proper error handling is also a tenet of responsible JavaScript. Error handling in JavaScript used to amount to not much more than letting the browser display whatever error messages it needed to! After a while, people discovered that they could hook into the error-handling mechanism and present their own error messages, but it still amounted to little more than a message to the user saying, “Sorry, something went wrong.

Basic object-orientation: the data and the function that operates on it are encapsulated nicely. 25 26 CHAPTER 1 ■ A BRIEF HISTORY OF JAVASCRIPT None of this is anything special or unusual in most other modern languages, but it took a while to find its way into JavaScript. Object-orientation isn’t the final word in JavaScript’s evolution to the modern day, however. A few others concepts come into play. “Responsible” JavaScript: Signs and Portents Responsibility may seem like an odd term to use with regard to a programming language.

12 CHAPTER 1 ■ A BRIEF HISTORY OF JAVASCRIPT Figure 1-4. 2180, latest as of this writing) Lest anyone think something fishy is going on, these speed tests were run on the same PC, without virtual machines or anything like that. So the difference is attributable to the browsers almost entirely. It’s possible that differences at runtime in the operating system itself could have had an impact. But I actually went so far as to reboot before running each test and didn’t load anything else, so it was roughly as close to identical at runtime as could reasonably be expected.

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