By Jason Morris
This can be a step by step consultant that goals to provide even a amateur Android developer an excellent take hold of of user-interface layout, whereas operating via examples, diagrams, and screenshots to show off a number of the widgets and instruments that the platform makes on hand.
Read Online or Download Android User Interface Development: Beginner's Guide PDF
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Extra resources for Android User Interface Development: Beginner's Guide
The first Activity we will create will use a simple ListView populated from a
We could have used RadioButton objects instead, but then the user would have needed to select an option, and then touch a Next Question button, requiring two touches. We could also have used a List (which interacts nicely with the fact that it needs to be dynamically populated), however, a List doesn't indicate an "action" to the user quite the way a Button does. When coding layouts, be careful with the measurement units that you use. It's strongly recommend that you stick to using sp for most purposes—if you can't use one of the special fill_parent or wrap_content values.
Text); 8. We'll be populating these two TextView objects with the data from the Burger object at the requested index. count == 0 ? name); return item; What just happened? We just wrote a custom Adapter class to present an array of Burger objects to the user in a ListView. getView. A View object will be created for each item in the ListView. However, when the data displayed by the ListView changes, the ListView will ask the ListAdapter to reuse each of the View objects it generated the first time around.