Download 50 Android Hacks by Carlos Sessa PDF
By Carlos Sessa
Summary
The most sensible programming concepts are usually the shortest and simplest—the hacks. during this compact and infinitely worthy ebook, Android professional Carlos Sessa provides 50 hacks that may prevent time, stretch your abilities, and perhaps even make you smile.
About this Book
Hacks. shrewdpermanent programming concepts to resolve thorny little difficulties. Ten traces of code that prevent days of labor. The little gemstones you study from the outdated man within the subsequent dice or from the geniuses on Stack Overflow. That's simply what you'll locate during this compact and invaluable book.
The identify 50 Android Hacks says all of it. starting from the mundane to the amazing, every one self-contained, absolutely illustrated hack is simply a few pages lengthy and contains annotated resource code. those useful strategies are geared up into twelve collections overlaying format, animations, styles, and more.
What's Inside
• Hack three making a customized ViewGroup
• Hack eight Slideshow utilizing the Ken Burns effect
• Hack 20 The Model-View-Presenter pattern
• Hack 23 The SyncAdapter pattern
• Hack 31 Aspect-oriented programming in Android
• Hack 34 utilizing Scala within Android
• Hack forty three Batching database operations
• Plus forty three extra hacks!
Most hacks paintings with Android 2.x and bigger. Version-specific hacks are truly marked.
Purchase of the print e-book encompasses a loose booklet in PDF, Kindle, and ePub codecs from Manning Publications.
About the Author
Carlos Sessa is a passionate expert Android developer. He's energetic on Stack Overflow and is an avid hack collector.
Table of Contents
<ol>• operating your means round layouts
• growing cool animations
• View counsel and tricks
• Tools
• Patterns
• operating with lists and adapters
• priceless libraries
• Interacting with different languages
• Ready-to-use snippets
• past database basics
• averting fragmentation
• construction tools
</ol>
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Extra resources for 50 Android Hacks
Sample text
The benefits of using a custom ViewGroup instead of adding margins by hand in an XML file are these: It’s easier to maintain if you’re using it in differ- ent activities. 2 Card layout created using the default Android widgets 9 Creating a custom ViewGroup You can use custom attributes to customize the position of the ViewGroup chil- dren. The XML will be easier to understand because it’ll be more concise. If you need to change the margins, you won’t need to recalculate by hand every child’s margin.
When a ViewStub is made visible, or when inflate() is invoked, the layout resource is inflated. The ViewStub then replaces itself in its parent with the inflated View or Views. You already know what a ViewStub is, so let’s see what you can do with it. In the following example you’ll use a ViewStub to lazy load a MapView. Imagine creating a view with the details about a place. Let’s look at two possible scenarios: Some venues don’t have GPS information The user might not need the map If the venue doesn’t have GPS information, you can’t place a marker on the map, and if the user doesn’t need the map, why load it?
Fade_in in our example, the effect was a fade-in. This technique works equally well with other effects. anim. ImageSwitcher works in the same way, except with images instead of text. 1 The bottom line The TextSwitcher and ImageSwitcher methods give you a simple way to add animated transitions. Their role is to make these transitions less dull and more vibrant. Don’t abuse them; you don’t want your application to look like a Christmas tree! 6+ By default, when you add views to a ViewGroup, they’re instantly added and displayed, but there’s an easier way to animate that action.