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

By Nizamettin Gok, Nitin Khanna

Build HTML5-based hybrid purposes for Android with a mixture of local Java and JavaScript elements, with no utilizing third-party libraries and wrappers comparable to PhoneGap or Titanium. This concise, hands-on publication takes you thru the total approach, from establishing your improvement setting to deploying your product to an app store.

how you can create apps that experience entry to local APIs, corresponding to situation, vibrator, sensors, and the digital camera, utilizing a JavaScript/Java bridge—and opt for the language that offers you higher functionality for every job. when you have event with HTML5 and JavaScript, you’ll speedy realize why hybrid app improvement is the wave of the future.
• arrange a improvement setting with HTML, CSS, and JavaScript instruments
• Create your first hybrid Android undertaking, utilizing Eclipse IDE
• Use the WebView regulate to host your hybrid software
• discover hybrid software structure, together with JavaScript/Java verbal exchange
• construct single-page purposes, utilizing JavaScript libraries reminiscent of spine and Underscore
• Get optimization information and important snippets for CSS, DOM, and JavaScript
• Distribute your software to Google Play and the Amazon Appstore

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Extra info for Building Hybrid Android Apps with Java and JavaScript: Applying Native Device APIs

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It is no longer associated with the window manager. In this state, the activity may still be alive, however, it is marked as a candidate for cleanup for when the system is running low on memory. Android allows developers to define multiple activities per application. Each of these activities can be launched from either within the application, as a result of user inter‐ action with a different activity, or externally from other applications or the Android platform. There is no hard and fast rule as to when to define a new activity, however as a general rule, every logical screen of the application should be implemented as a sep‐ arate activity.

Chapter 2: Setting Up Your Android Development Environment * This class was automatically generated by the * aapt tool from the resource data it found. It * should not be modified by hand. helloworld; public final class R { public static final class attr { } public static final class drawable { public static final int ic_launcher=0x7f020000; } public static final class layout { public static final int main=0x7f030000; } public static final class string { public static final int app_name=0x7f040000; } } Service Interface Precompilation The second build step deals with autogeneration of Java code corresponding to the service interfaces declared in your project.

We chose Apache Ant as our command-line build tool because Google, along with Eclipse plug-ins, ships an Ant-based build system and associated tool chain. Simply put, Ant is a tool that processes an XML-based scripting language to automate tasks. xml. You can define all necessary build steps in this file. Each Ant XML file is described in terms of a project, target, or task. Google announced as part of the 2013 I/O conference that they will be migrating from an Ant-based build system to a Gradle (Groovy) based build system for Android.

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