barcode reader java application 8: WebOS Security in Android

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8: WebOS Security
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Working behind the scenes are the assistants, which implement the actual application logic and conduct the heavy lifting (such as making web requests) required to complete the application s purpose The assistant is the master of the scene stack and coordinates the controller to push and remove scenes Assistants are bound to scenes and the application via filenaming conventions and the sourcesjson file, which exists in the root of the application s package Every application must have at least one scene assistant and one stage assistant An application assistant is not required, but larger apps that have multiple stages tend to have one The stage and application assistants are accessible to all the scenes within an application stage and are generally used to coordinate and contain global variables Views are HTML pages defining the semantic markup of the application Standard Cascading Style Sheets (CSS) can be used to change the look and feel of the view Palm provides WebOS developers with a collection of common controls, known as widgets, to speed development and provide a consistent user experience Developers specify which widgets to include in their views by inserting special div tags into the output HTML document For example, the following tag includes a button widget:
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<div id="MyButton" name="MyButton1" x-mojo-element="Button"></div>
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Development and Security Testing
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Palm has been very forthcoming with its SDK, and third-party applications are obviously a priority The WebOS SDK (aka the Mojo SDK) may be downloaded for free from http://developerpalmcom Developers are required to register before they are allowed to access the SDK Registration is free The Mojo SDK is available for Linux, Mac OS X, and Windows This author slightly prefers the Mac OS X environment over Windows because of stronger terminal support when actually logging into and accessing the device As of this writing, the SDK is in beta and there have been several changes as Palm integrates feedback from application developers and continues to develop new features Be vigilant of SDK changes, especially as they relate to changes in security behavior A precedent for this already exists Palm changed the default behavior of HTML escaping in a previous release Thankfully, this change was made from an insecure default to a secure one, but who knows what changes the future may bring Developers can use their favorite web development environment Palm recommends using Eclipse (wwweclipseorg) with the Aptana plug-ins More instructions on how to configure this environment are available from http://developerpalmcom as part of the Getting Started how-to guide Once Eclipse is running, developers may install
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a WebOS Eclipse plug-in This plug-in adds wizards for creating applications and scenes as well as for packaging code and installing it on the device
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By default, developers cannot access the terminal on the device or install unsigned applications To be allowed to carry out these actions, developer mode must first be enabled To do so, follow these instructions:
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For more information, refer to Command Line Tools on the Palm website (http://developerpalmcom/indexphp option=com_content&view=article&id=1552)
1 Boot the WebOS device 2 Once the main launcher screen is on top, type
upupdowndownleftrightleftrightbastart While you type this, the search UI will pop up and nothing will appear to be happening
3 Once the entire code has been entered, the Developer Mode Application will
appear Select it by clicking on it
4 Toggle developer mode by setting the value of the slider in the top right to On 5 Exit the Developer Mode Application and reset the device
The emulator enables developer mode by default, so the preceding instructions are unnecessary when you re using the emulator When the phone is enabled in developer mode, many of the security protections are disabled Only use development mode on development devices or temporarily when performing testing Do not leave your personal phone in development mode
Accessing Linux
WebOS stands apart from other mobile platforms due to the unprecedented access Palm provides to the underlying Linux OS To connect a terminal to Linux, follow these steps:
1 Plug in the WebOS device or start the emulator 2 If you re on Windows:
a Open a command prompt b Run novacom t open tty://
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