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Mobile Computing Adapters, Dialogs

Lecture#08

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Lecture Contents

v AdaptervSimpleCursorAdapter

v ArrayAdapter

vDialogvDialog Class

vDialog-themed Activity 

vToasts

v

v

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Adapters

  Adapters are bridging classes that bind data to  Views (such as List Views) used in the userinterface.

The adapter is responsible for1.Creating the child Views used to represent each

item within the parent View (say a ListView)

2.Providing access to the underlying data (say an ArrayList)

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Simple Cursor Adapter

v An easy adapter to map columns from a cursorto TextViews or ImageViews

v You can specify which columns you want, which views you want to display the columns, and theXML file that defines the appearance of these views.

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Simple Cursor Adapte Example

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Simple Cursor Adapte Example

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ArrayAdapter

vThe Array Adapter uses generics to bind an Adapter View to an array of objects of thespecified class

vBy default the Array Adapter uses the toString() value of each object in the array to create andpopulate Text Views

v Alternative constructors enable you to use more

complex layoutsv You can even extend the class to use alternativesto Text Views (to display data)

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ArrayAdapter ExampleSteps Involved::::1.Layout Definitions

2. Adapter Class

3. Activity to show elements

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ArrayAdapter Example (Adapter Class)

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ArrayAdapter Example (Main Class)

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ArrayAdapter Example (row.xml)

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ArrayAdapter Example (main.xml)

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ArrayAdapter Example (Output)

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ArrayAdapter Complex ExampleSteps Involved::::1.Layout Definitions

2. View Data Class

3. Adapter Class4. Activity to show elements

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Layouts