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Android Reference

Adapter


android.widget

Interface Adapter

    • Method Detail

      • registerDataSetObserver

        void registerDataSetObserver(DataSetObserver observer)
        Register an observer that is called when changes happen to the data used by this adapter.
        Parameters:
        observer - the object that gets notified when the data set changes.
      • getCount

        int getCount()
        How many items are in the data set represented by this Adapter.
        Returns:
        Count of items.
      • getItem

        Object getItem(int position)
        Get the data item associated with the specified position in the data set.
        Parameters:
        position - Position of the item whose data we want within the adapter's data set.
        Returns:
        The data at the specified position.
      • getItemId

        long getItemId(int position)
        Get the row id associated with the specified position in the list.
        Parameters:
        position - The position of the item within the adapter's data set whose row id we want.
        Returns:
        The id of the item at the specified position.
      • hasStableIds

        boolean hasStableIds()
        Indicates whether the item ids are stable across changes to the underlying data.
        Returns:
        True if the same id always refers to the same object.
      • getView

        View getView(int position,
                   View convertView,
                   ViewGroup parent)
        Get a View that displays the data at the specified position in the data set. You can either create a View manually or inflate it from an XML layout file. When the View is inflated, the parent View (GridView, ListView...) will apply default layout parameters unless you use LayoutInflater.inflate(int, android.view.ViewGroup, boolean) to specify a root view and to prevent attachment to the root.
        Parameters:
        position - The position of the item within the adapter's data set of the item whose view we want.
        convertView - The old view to reuse, if possible. Note: You should check that this view is non-null and of an appropriate type before using. If it is not possible to convert this view to display the correct data, this method can create a new view. Heterogeneous lists can specify their number of view types, so that this View is always of the right type (see getViewTypeCount() and getItemViewType(int)).
        parent - The parent that this view will eventually be attached to
        Returns:
        A View corresponding to the data at the specified position.
      • isEmpty

        boolean isEmpty()
        Returns:
        true if this adapter doesn't contain any data. This is used to determine whether the empty view should be displayed. A typical implementation will return getCount() == 0 but since getCount() includes the headers and footers, specialized adapters might want a different behavior.


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