Android Adapters → Android BaseAdapter – Camposha

Android Adapters

Android Adapters

Android BaseAdapter

BaseAdapter as the name suggests BaseAdapter is a base adapter, or super adapter. An adapter is a class that acts as a bridge between an adapterview and the underlying data source.

By being a base adapter BaseAdapter provides a common implementation for adapters that can be used in:

  1. ListView,GridView – By use of listAdapter.
  2. Spinner – By use of spinnerAdapter.

BaseAdapter Details

  1. BaseAdapter was introduced back in Android API level 1.
  2. It’s actually an abstract class in that it has some abstract methods that need overriding. Therefore you have to either choose to implement those methods or make your child class as well.
    public abstract class BaseAdapter ..{}
  3. BaseAdapter derives from java.lang.Object.
    public abstract class BaseAdapter extends Object ...{}
  4. BaseAdapter implements ListAdapter and SpinnerAdapter. SpinnerAdapter is used for spinners while ListAdapter for ListViews and GridViews.
    public abstract class BaseAdapter extends Object implements ListAdapter, SpinnerAdapter{..}

BaseAdapter Children and GrandChildren

BaseAdapter has several direct and indirect sub-classes.

No. Class Type Description
1. ArrayAdapter Direct While BaseAdapter is always abstract, this is a concrete implementation of BaseAdapter backed by an array of arbitrary objects.
2. SimpleAdapter Direct A BaseAdapter child we can use to provide mapping between static data to views defined in XML file.
3. CursorAdapter Direct A BaseAdapter child that exposes data from a cursor to a ListView.
4. ResourceCursorAdapter Indirect A CursorAdapter child that creates views defined in an XML file.
5. SimpleCursorAdapter Indirect A a ResourceCursorAdapter child that can map columns from Cursor or TextViews or ImageViews defined in an XML file.

 

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