android.databinding.adapters

Class ListenerUtil

java.lang.Object

android.databinding.adapters.ListenerUtil

public class ListenerUtil
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ListenerUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	trackListener(android.view.View view, T listener, int listenerResourceId) This method tracks listeners for a View.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ListenerUtil

public ListenerUtil()

Method Detail

trackListener

public static <T> T trackListener(android.view.View view,
                  T listener,
                  int listenerResourceId)

This method tracks listeners for a View. Only one listener per listenerResourceId can be tracked at a time. This is useful for add*Listener and remove*Listener methods when used with BindingAdapters. This guarantees not to leak the listener or the View, so will not keep a strong reference to either. Example usage:

 {@code

Parameters:

view - The View that will have this listener

listener - The listener to keep track of. May be null if the listener is being removed.

listenerResourceId - A unique resource ID associated with the listener type.

Returns:

The previously tracked listener. This will be null if the View did not have a previously-tracked listener.