Difference between revisions of "BlackBerry : Develop Simple Apps"
| Line 3: | Line 3: | ||
== Read Code from the BlackBerry Samples == | == Read Code from the BlackBerry Samples == | ||
[http://docs.blackberry.com/en/developers/subcategories/?userType=21&category=Sample+Applications Here are some of the most important BlackBerry Samples] | [http://docs.blackberry.com/en/developers/subcategories/?userType=21&category=Sample+Applications Here are some of the most important BlackBerry Samples] | ||
| + | ''The content from BlackBerry developer site has been used for these notes for which a grateful acknowledgment is made.'' | ||
--------------------------- | --------------------------- | ||
| Line 28: | Line 29: | ||
[http://docs.blackberry.com/en/developers/deliverables/7721/Custom_buttons_sample_app_overview_546026_11.jsp Overview] | [http://docs.blackberry.com/en/developers/deliverables/7721/Custom_buttons_sample_app_overview_546026_11.jsp Overview] | ||
| − | The custom buttons sample application demonstrates how to extend the Field class to create a variety of different button UI components. | + | '''The custom buttons sample application demonstrates how to extend the Field class to create a variety of different button UI components.''' |
The sample application demonstrates how to create the following types of buttons: | The sample application demonstrates how to create the following types of buttons: | ||
| Line 41: | Line 42: | ||
In addition to creating and displaying these custom buttons, the sample application also demonstrates how to attach listeners to these custom buttons. Listeners are components that execute code when an event occurs. In the sample application, when you click one of these buttons, a dialog box appears with text specifying which of the buttons you clicked. | In addition to creating and displaying these custom buttons, the sample application also demonstrates how to attach listeners to these custom buttons. Listeners are components that execute code when an event occurs. In the sample application, when you click one of these buttons, a dialog box appears with text specifying which of the buttons you clicked. | ||
| + | ---------------------- | ||
| + | |||
| + | === Decor === | ||
| + | [http://docs.blackberry.com/en/developers/deliverables/9076/Decor_sample_app_overview_672047_11.jsp Overview] | ||
| + | |||
| + | '''The decor sample application demonstrates how to create custom fields by specifying their border, padding, color, and background attributes.''' | ||
| + | |||
| + | You can use the sample application to create fields that have the following attributes: | ||
| + | |||
| + | * solid rounded border with a solid background | ||
| + | * dotted rounded border with a transparent background | ||
| + | * dashed simple border with a gradient background | ||
| + | * dotted simple border with no padding | ||
| + | * beveled border with an image as a background | ||
Revision as of 12:56, 24 February 2011
Main Page · Course Description · Course Topics · Schedule, Students, Teams · Course Resources · Course Projects
BlackBerry Activities
- Start and run the Eclipse for BlackBerry as installed in the previous lecture.
- Open the Subversion Perspective in Eclipse for BlackBerry.
- Check out the Simple Sample from BlackBerry Course Repository
- Run the sample and change it.
- Define the main steps involved in developing BlackBerry applications.
- Write a small tutorial (main steps) about using Eclipse to develop BlackBerry applications.
Start the lab activities in the order defined below:
Read Code from the BlackBerry Samples
Here are some of the most important BlackBerry Samples The content from BlackBerry developer site has been used for these notes for which a grateful acknowledgment is made.
Active Text Fields
The active text field sample application shows how a BlackBerry® device user can access customized items from the context menu when a pattern is recognized in an active text field. You can create active text fields by using theActiveAutoTextEditField class and ActiveRichTextField class.
When the BlackBerry device starts, the application, pattern, and associated menu items are registered with thePatternRepository. When text with the matching pattern is found in an active text field, the text is highlighted. When the user clicks highlighted text, the context menu is displayed with the menu items that are associated with the pattern.
In the sample application, when the user types a nine-digit number into an active text field, the user can click this number and a context menu with Status and Location options appears. When the user clicks one of the options, the application displays the requested information.
Bitmap Scaling
The bitmap scaling sample application demonstrates how to scale the size of a Bitmap image.
The sample application demostrates how to scale an original Bitmap image into new Bitmap objects, how to apply filters that help reduce the pixelated appearance of a scaled Bitmap image, and how to preserve the aspect ratio of the image.
Custom Buttons
The custom buttons sample application demonstrates how to extend the Field class to create a variety of different button UI components.
The sample application demonstrates how to create the following types of buttons:
- rectangle
- triangle
- octagon
- rectangle with a fixed width
- rectangle with a fixed width and a long text label
- rectangle with a full screen width
- rectangle with a color background
- rectangle with a .bmp image as the background
In addition to creating and displaying these custom buttons, the sample application also demonstrates how to attach listeners to these custom buttons. Listeners are components that execute code when an event occurs. In the sample application, when you click one of these buttons, a dialog box appears with text specifying which of the buttons you clicked.
Decor
The decor sample application demonstrates how to create custom fields by specifying their border, padding, color, and background attributes.
You can use the sample application to create fields that have the following attributes:
- solid rounded border with a solid background
- dotted rounded border with a transparent background
- dashed simple border with a gradient background
- dotted simple border with no padding
- beveled border with an image as a background
