Android™ Application Development - Bahar Ali Khan

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Chapter 3: Creating <strong>Application</strong>s and Activities 56 value Styles support inheritance using the parent attribute on the style tag, making it easy to create simple variations. The following example shows two styles that can also be used as a theme; a base style that sets several text properties and a second style that modifi es the fi rst to specify a smaller font. 14sp #111 8sp Drawables Drawable resources include bitmaps and NinePatch (stretchable PNG) images. They are stored as individual fi les in the res/drawable folder. The resource identifi er for a bitmap resource is the lowercase fi lename without an extension. The preferred format for a bitmap resource is PNG, although JPG and GIF fi les are also supported. NinePatch (or stretchable) images are PNG fi les that mark the parts of an image that can be stretched. NinePatch images must be properly defi ned PNG fi les that end in .9.png. The resource identifi er for NinePatches is the fi lename without the trailing .9.png. A NinePatch is a variation of a PNG image that uses a 1-pixel border to defi ne the area of the image that can be stretched if the image is enlarged. To create a NinePatch, draw single-pixel black lines that represent stretchable areas along the left and top borders of your image. The unmarked sections won’t be resized, and the relative size of each of the marked sections will remain the same as the image size changes. Layouts NinePatches are a powerful technique for creating images for the backgrounds of Views or Activities that may have a variable size; for example, Android uses NinePatches for creating button backgrounds. Layout resources let you decouple your presentation layer by designing user-interface layouts in XML rather than constructing them in code. The most common use of a layout is to defi ne the user interface for an Activity. Once defi ned in XML, the layout is “infl ated” within an Activity using setContentView, usually within the onCreate method.
Chapter 3: Creating <strong>Application</strong>s and Activities You can also reference layouts from within other layout resources, such as layouts for each row in a List View. More detailed information on using and creating layouts in Activities can be found in Chapter 4. Using layouts to create your screens is best-practice UI design in Android. The decoupling of the layout from the code lets you create optimized layouts for different hardware confi gurations, such as varying screen sizes, orientation, or the presence of keyboards and touch screens. Each layout defi nition is stored in a separate fi le, each containing a single layout, in the res/layout folder. The fi lename then becomes the resource identifi er. A thorough explanation of layout containers and View elements is included in the next chapter, but as an example, the following code snippet shows the layout created by the New Project Wizard. It uses a LinearLayout as a layout container for a TextView that displays the “Hello World” greeting. Animations Android supports two types of animation. Tweened animations can be used to rotate, move, stretch, and fade a View; or you can create frame-by-frame animations to display a sequence of drawable images. A comprehensive overview of creating, using, and applying animations can be found in Chapter 11. Defi ning animations as external resources allows you to reuse the same sequence in multiple places and provides you with the opportunity to present an alternative animation based on device hardware or orientation. Tweened Animations Each tweened animation is stored in a separate XML fi le in the project’s res/anim folder. As with layouts and drawable resources, the animation’s fi lename is used as its resource identifi er. An animation can be defi ned for changes in alpha (fading), scale (scaling), translate (moving), or rotate (rotating). Each of these animation types supports attributes to defi ne what the sequence will do: Alpha fromAlpha and toAlpha Float from 0 to 1 Scale fromXScale/toXScale fromYScale/toYScale pivotX/pivotY Float from 0 to 1 Float from 0 to 1 String of the percentage of graphic width/height from 0% to 100% 57
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Page 43 and 44: Getting Started All you need to sta
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Page 47 and 48: Installing the ADT Plug-in Install
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Page 59 and 60: Chapter 2: Getting Started To start
Page 61 and 62: Ensuring a Seamless User Experience
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Page 85 and 86: Referencing Resources in Resources
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} Chapter 6: Data Storage, Retrieva
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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Accessing Android Hardware Android
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Chapter 10: Accessing Android Hardw
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content.put(Audio.AudioColumns.DATE
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public void onShutter() { // TODO D
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public void setPitch(float pitch) {
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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