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AsyncListUtil.ViewCallback

public static abstract class AsyncListUtil.ViewCallback
extends Object

java.lang.Object
↳	android.support.v7.util.AsyncListUtil.ViewCallback

The callback that links AsyncListUtil with the list view.

All methods are called on the main thread.

Summary

Constants
`int`	`HINT_SCROLL_ASC` Scrolling in ascending order (from lower to higher positions in the order of the backing storage).
`int`	`HINT_SCROLL_DESC` Scrolling in descending order (from higher to lower positions in the order of the backing storage).
`int`	`HINT_SCROLL_NONE` No scroll direction hint available.

Public constructors
`AsyncListUtil.ViewCallback()`

Public methods
`void`	`extendRangeInto(int[] range, int[] outRange, int scrollHint)` Compute a wider range of items that will be loaded for smoother scrolling.
`abstract void`	`getItemRangeInto(int[] outRange)` Compute the range of visible item positions.
`abstract void`	`onDataRefresh()` Called when the entire data set has changed.
`abstract void`	`onItemLoaded(int position)` Called when an item at the given position is loaded.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Constants

HINT_SCROLL_ASC

int HINT_SCROLL_ASC

Scrolling in ascending order (from lower to higher positions in the order of the backing storage).

Constant Value: 2 (0x00000002)

HINT_SCROLL_DESC

int HINT_SCROLL_DESC

Scrolling in descending order (from higher to lower positions in the order of the backing storage).

Constant Value: 1 (0x00000001)

HINT_SCROLL_NONE

int HINT_SCROLL_NONE

No scroll direction hint available.

Constant Value: 0 (0x00000000)

Public constructors

AsyncListUtil.ViewCallback

AsyncListUtil.ViewCallback ()

Public methods

extendRangeInto

void extendRangeInto (int[] range, 
                int[] outRange, 
                int scrollHint)

Compute a wider range of items that will be loaded for smoother scrolling.

If there is no scroll hint, the default implementation extends the visible range by half its length in both directions. If there is a scroll hint, the range is extended by its full length in the scroll direction, and by half in the other direction.

For example, if range is {100, 200} and scrollHint is HINT_SCROLL_ASC, then outRange will be {50, 300}.

However, if scrollHint is HINT_SCROLL_NONE, then outRange will be {50, 250}

Parameters
`range`	`int`: Visible item range.
`outRange`	`int`: Extended range.
`scrollHint`	`int`: The scroll direction hint.

getItemRangeInto

void getItemRangeInto (int[] outRange)

Compute the range of visible item positions.

outRange[0] is the position of the first visible item (in the order of the backing storage).

outRange[1] is the position of the last visible item (in the order of the backing storage).

Negative positions and positions greater or equal to getItemCount() are invalid. If the returned range contains invalid positions it is ignored (no item will be loaded).

Parameters
`outRange`	`int`: The visible item range.

onDataRefresh

void onDataRefresh ()

Called when the entire data set has changed.

onItemLoaded

void onItemLoaded (int position)

Called when an item at the given position is loaded.

Parameters
`position`	`int`: Item position.