Android APIs
Added in API level 1
public static interface

GestureDetector.OnGestureListener

android.view.GestureDetector.OnGestureListener
Known Indirect Subclasses

Class Overview

The listener that is used to notify when gestures occur. If you want to listen for all the different gestures then implement this interface. If you only want to listen for a subset it might be easier to extend GestureDetector.SimpleOnGestureListener.

Summary

Public Methods
abstract boolean onDown(MotionEvent e)
Notified when a tap occurs with the down MotionEvent that triggered it.
abstract boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
Notified of a fling event when it occurs with the initial on down MotionEvent and the matching up MotionEvent.
abstract void onLongPress(MotionEvent e)
Notified when a long press occurs with the initial on down MotionEvent that trigged it.
abstract boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
Notified when a scroll occurs with the initial on down MotionEvent and the current move MotionEvent.
abstract void onShowPress(MotionEvent e)
The user has performed a down MotionEvent and not performed a move or up yet.
abstract boolean onSingleTapUp(MotionEvent e)
Notified when a tap occurs with the up MotionEvent that triggered it.

Public Methods

public abstract boolean onDown (MotionEvent e)

Added in API level 1

Notified when a tap occurs with the down MotionEvent that triggered it. This will be triggered immediately for every down event. All other events should be preceded by this.

Parameters
e The down motion event.
Returns
boolean

public abstract boolean onFling (MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)

Added in API level 1

Notified of a fling event when it occurs with the initial on down MotionEvent and the matching up MotionEvent. The calculated velocity is supplied along the x and y axis in pixels per second.

Parameters
e1 The first down motion event that started the fling.
e2 The move motion event that triggered the current onFling.
velocityX The velocity of this fling measured in pixels per second along the x axis.
velocityY The velocity of this fling measured in pixels per second along the y axis.
Returns
boolean true if the event is consumed, else false

public abstract void onLongPress (MotionEvent e)

Added in API level 1

Notified when a long press occurs with the initial on down MotionEvent that trigged it.

Parameters
e The initial on down motion event that started the longpress.

public abstract boolean onScroll (MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)

Added in API level 1

Notified when a scroll occurs with the initial on down MotionEvent and the current move MotionEvent. The distance in x and y is also supplied for convenience.

Parameters
e1 The first down motion event that started the scrolling.
e2 The move motion event that triggered the current onScroll.
distanceX The distance along the X axis that has been scrolled since the last call to onScroll. This is NOT the distance between e1 and e2.
distanceY The distance along the Y axis that has been scrolled since the last call to onScroll. This is NOT the distance between e1 and e2.
Returns
boolean true if the event is consumed, else false

public abstract void onShowPress (MotionEvent e)

Added in API level 1

The user has performed a down MotionEvent and not performed a move or up yet. This event is commonly used to provide visual feedback to the user to let them know that their action has been recognized i.e. highlight an element.

Parameters
e The down motion event

public abstract boolean onSingleTapUp (MotionEvent e)

Added in API level 1

Notified when a tap occurs with the up MotionEvent that triggered it.

Parameters
e The up motion event that completed the first tap
Returns
boolean true if the event is consumed, else false