Android, Windows Phone, iPhone, iPad, Windows Mobile, BlackBerry, Java Mobile, SymbianOS, WebOS, MeeGo, BaDa Tutorials

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iPhone 3D Programming : Crisper Text with Distance Fields (part 1) - Generating Distance Fields with Python

The concept of a distance field may seem obscure, but it’s useful in many surprising ways. Not only does it provide a way to preserve quality of edges (with both ES 1.1 and ES 2.0), but it also makes it easy to apply a bevy of text effects, such as shadows and outlines (these are ES 2.0 only).

Mapping Well-Known Patterns onto Symbian OS : Singleton

On Symbian OS, the window server (WSERV) provides a low-level API to the system's user interface devices – screens, keyboard and pointer. The API is extensive and complex and would make most application development unnecessarily convoluted if used directly.

Mapping Well-Known Patterns onto Symbian OS : Model–View–Controller

Symbian OS supports multiple GUI variants, which are supplied by UI vendors as a layer on top of Symbian OS. By supporting multiple GUI variants, Symbian OS enables device creators to differentiate products based on form factor, UI 'look and feel', and interaction style.

The Anatomy of a Mobile Site : STYLING WITH CSS - CSS Considerations for Mobile & Optimizing CSS

Modern web designers take Cascading Style Sheet (CSS) support for granted on the desktop medium. Admittedly, some older browsers exhibit certain quirks when complex styling is used, but it is more or less a well-understood science.

The Anatomy of a Mobile Site : INVOKING OTHER DEVICE CAPABILITIES & THE STATE OF JAVASCRIPT

In an ideal workflow, this would not be necessary; the design phase of the project will have been completed in Catalyst, and all that will remain will be editing it in Flash Builder.

iPad Development : The Dual-Action Color Popover (part 3) - Serving Two Masters

Purists may object to the creation of subclasses that don't have any behavior or data of their own, but then again, purists object to a lot of things. Being reality-based, we'll do it this way, both because it's simple and because it lets DudelViewController deal with all the popovers as consistently as possible.

iPad Development : The Dual-Action Color Popover (part 2) - Hooking Up the Grid

We register methods to listen for activity from the ColorGrid, each of which grabs the latest touched color from the notification object. If the touch ended, we send out yet another notification, so that our main controller gets the message that a color has been set.

iPad Development : The Dual-Action Color Popover (part 1) - Creating a Simple Color Grid

Let's start by making a view class that just knows how to display a grid of colors, and respond to touch events by sending notifications containing the touched color.

XNA Game Studio 3.0 : Creating Fake 3-D - Creating Shadows Using Transparent Colors

Lots of the graphics in games are faked. Rather than make something 3-D, a game programmer makes something that looks 3-D but turns out to be much easier to program.

Android Application Development : ViewGroups (part 2) - ListView, ListActivity, ScrollView & TabHost

ListView is similar to Gallery, but uses a vertically scrolling list in place of Gallery’s horizontally scrolling list. To create a ListView that takes up the entire screen, Android provides the ListActivity class .

Android Application Development : ViewGroups (part 1) - Gallery and GridView

The Gallery ViewGroup displays multiple items in a horizontally scrolling list. The currently selected item is locked in the center of the screen. Any items that approach the edge of the screen begin to fade, giving the user the impression that there may be more items “around the corner.”

Java ME on Symbian OS : MIDP 2.0 Game API Core Concepts

The MIDP 2.0 Game API supplies a rich game development framework. A lot of the functionality was incorporated into the MIDP 2.0 specification as a result of real-world experiences writing early Java ME games.

Java ME on Symbian OS : Building a Simple MIDP Game

The point to be demonstrated here is that the MIDP Game API was developed for the feature phone market. In this market, there are limits on heap size, thread pools, JAR size, few or no optional JSRs and minimal multimedia capabilities.

jQuery 1.3 : Compound effects & Creating custom animations

Sometimes we have a need to toggle the visibility of elements, rather than displaying them once as we did in the previous example. Toggling can be achieved by first checking the visibility of the matched elements and then attaching the appropriate method.

jQuery 1.3 : Effects and speed

When we include a speed (or, more precisely, a duration) with .show() or .hide(), it becomes animated—occurring over a specified period of time.

Mobile Web Apps : Quick Wins (part 2) - Form Field Attributes

With our links all polished up, let’s turn to forms. HTML5 drags the basic form into the future with a quiver of shiny new input types and form attributes, which are well-supported on the current crop of mobile devices.

Mobile Web Apps : Quick Wins (part 1) - Nifty Links

For security reasons, mobile web applications are sandboxed away from many built-in features of the mobile device; for example, unlike native apps, they’re not able to retrieve a list of a user’s contacts, or take a photo with the device’s camera.

iPhone Developer : Using Creative Popping Options

Recipe 1 demonstrates how to do this. When the second view is ready to transition to the third, the navigation controller goes ahead and performs the push. This creates the proper animation for the viewer, from view two to view three. Then, without animation, the code pops the last two views, leaving the stack at view one.

iPhone Developer : Navigating Between View Controllers

An instance variable stores the current depth number, which is used to show the current level and decide whether to display a further push option. The maximum depth here is 6. In real use, you’d use more meaningful view controllers or contents. This sample demonstrates things at their simplest level.

iOS SDK : Basic SQLite Database Manipulation (part 3) - SQLite Binding, Inserting, Updating, and Deleting

Updating a record is as straightforward as inserting it. The changeAPhotoImage first creates a SQL string with parameters. It then binds a file’s binary data to photo and an integer to id. After binding, it then calls the step function once, finalizes the statement, and closes the database. Notice that updating requires the record’s id, as SQLite uses the id to update the correct record.

iOS SDK : Basic SQLite Database Manipulation (part 2) - Select

You select one or more records from a SQL database using a select statement. Because a select statement usually returns multiple rows, you must loop through the row set if you wish to obtain all records.

iOS SDK : Basic SQLite Database Manipulation (part 1) - Opening the Database, Statements, Preparing Statements, and Executing Statements

If you have ever used a database from within a programming language, SQLite database manipulation using C should seem intuitive. You open the database. You create a prepared statement containing a SQL string. That statement might have one or more parameters you bind values to.

The Anatomy of a Mobile Site : PRIMARY SITE CONTENT (part 3) - Forms

Developers are often tempted to make the mobile version of a website far more of a read-only experience than its desktop equivalent.

The Anatomy of a Mobile Site : PRIMARY SITE CONTENT (part 2) - Embedding Images and Media

Screen dimensions are a vital part of a good mobile device characteristics database, and you should be able to key their values off the user-agent header that arrives in the HTTP request (or the mobile plug-in will do it automatically for you).

The Anatomy of a Mobile Site : PRIMARY SITE CONTENT (part 1) - Text, Typography& Pagination

Page size is a perennial consideration for mobile web developers. Historically, there were actually hard limits on the (byte) size of page that many devices could display and cache, and slower network speeds meant that large pages might simply take too long to load.

iPad Does Not Show Up in iTunes & Synchronization Problems

If you do uncheck or de-select Calendars or Contacts in the Mobile Me or Exchange accounts, you won't be able to see that information anymore on the iPad until you set up the synchronization from the computer via iTunes.

iPad Troubleshooting : Re-register with Your iTunes Account

Every iPad is associated with or tied to an iTunes account. That association allows you to purchase iTunes music and videos, and apps from your iPad. It is also that association that allows you to play music from your iTunes account on your computer on your iPad.

XNA Game Studio 3.0 : Making a Prettier Clock with 3-D Text (part 2)

Simply putting the value true in the position of the condition causes the loop to never stop. If you’re wondering what would happen if you ran a loop like this, you can try it if you like, but I can save you the trouble.

XNA Game Studio 3.0 : Making a Prettier Clock with 3-D Text (part 1)

If you want the 3-D effect to be perfect, you need to draw lots more red versions to "fill in the gaps." You could do this by simply copying the code four times, but perhaps you remember reading somewhere that computers are supposed to make life easier, and this doesn’t feel very easy at all.

Android Views (part 3) - CheckBoxes, RadioButtons, and Spinners

Spinners are similar to combo boxes in some frameworks. A combo box typically displays the currently selected option, along with a pull-down list from which the user can click on another option to select it.