By Carlos Sessa
The top programming concepts are frequently the shortest and simplest—the hacks. during this compact and infinitely important ebook, Android specialist Carlos Sessa provides 50 hacks that may prevent time, stretch your talents, and perhaps even make you smile.
About this Book
Hacks. smart programming strategies to unravel thorny little difficulties. Ten traces of code that prevent days of labor. The little gem stones you research from the outdated man within the subsequent dice or from the geniuses on Stack Overflow.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 important book.
The identify 50 Android Hacks says all of it. starting from the mundane to the striking, each one self-contained, totally illustrated hack is simply a number of pages lengthy and comprises annotated resource code. those sensible suggestions are prepared into twelve collections protecting format, animations, styles, and more.
• 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 inside of Android
• Hack forty three Batching database operations
• Plus forty three extra hacks!
Most hacks paintings with Android 2.x and larger. Version-specific hacks are basically marked.
Purchase of the print e-book contains 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 approach round layouts
• growing cool animations
• View guidance and tricks
• operating with lists and adapters
• priceless libraries
• Interacting with different languages
• Ready-to-use snippets
• past database basics
• fending off fragmentation
• construction tools
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Additional resources for 50 Android Hacks
We’ll first create a Rectangle instance that will play the role of the box B. The Rectangle class also knows how to draw itself to a canvas and contains all of the boring logic regarding how to update its position to be drawn in the correct place. When the onDraw() method gets called, we’ll change the rectangle’s position C and draw it to the canvas D. The invalidate() call E is the hack itself. The invalidate() call is a View’s method to force a view to draw. Placing it inside the onDraw() method means Slideshow using the Ken Burns effect 25 that onDraw() will be called as soon as the view finishes drawing itself.
6+ One of the first products my company created is called FeedTV. The idea behind FeedTV is to change the way we read RSS feeds. Instead of showing them in a long list, we created something like a photo frame application that shows the feed’s headline and its main image. 1. 1 FeedTV we’ll analyze the image and, using it’s size and aspect ratio, running in an iPad apply something called the Ken Burns effect. The Ken Burns effect is nothing more than a type of panning and zooming effect used in video production from still imagery.
These animations will be applied randomly to an ImageView and, when the animation is finished, we’ll start another animation with the next photo. The main layout will be a FrameLayout, and we’ll place ImageViews inside it. addView(mView); Create container. Create and add ImageView. FIT_XY); and increment index. length) ? mIndex + 1 : 0; return ret; } So far, so good. We’ll use the createNewView() to create new ImageViews and keep track of the image we’re showing next. The next step is to create a method called nextAnimation().
50 Android Hacks by Carlos Sessa