Overview

The callback that provides data access for AsyncListUtil.

All methods are called on the background thread.

Summary

Constructors

Methods

Refresh the data set and return the new data item count.

If the data is being accessed through this is where the new cursor should be created.

Returns:

Data item count.

Fill the given tile.

The provided tile might be a recycled tile, in which case it will already have objects. It is suggested to re-use these objects if possible in your use case.

Parameters:

startPosition: The start position in the list.
itemCount: The data item count.
data: The data item array to fill into. Should not be accessed beyond itemCount.

Recycle the objects created in AsyncListUtil.DataCallback.fillData(T[], int, int) if necessary.

Parameters:

data: Array of data items. Should not be accessed beyond itemCount.
itemCount: The data item count.

Returns tile cache size limit (in tiles).

The actual number of cached tiles will be the maximum of this value and the number of tiles that is required to cover the range returned by AsyncListUtil.ViewCallback.extendRangeInto(int[], int[], int).

For example, if this method returns 10, and the most recent call to AsyncListUtil.ViewCallback.extendRangeInto(int[], int[], int) returned {100, 179}, and the tile size is 5, then the maximum number of cached tiles will be 16.

However, if the tile size is 20, then the maximum number of cached tiles will be 10.

The default implementation returns 10.

Returns:

Maximum cache size.