GestureDetector.OnGestureListener

Kotlin |Java

public static interface GestureDetector.OnGestureListener

android.view.GestureDetector.OnGestureListener

Known indirect subclasses

Gallery, GestureDetector.SimpleOnGestureListener

Gallery	This class was deprecated in API level 16. This widget is no longer supported. Other horizontally scrolling widgets include `HorizontalScrollView` and `ViewPager` from the support library.
GestureDetector.SimpleOnGestureListener	A convenience class to extend when you only want to listen for a subset of all the gestures.

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 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

onDown

Added in API level 1

public abstract boolean onDown (MotionEvent e)

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`	`MotionEvent`: The down motion event. This value cannot be `null`.

Returns
`boolean`

onFling

Added in API level 1

public 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. The calculated velocity is supplied along the x and y axis in pixels per second.

Parameters
`e1`	`MotionEvent`: The first down motion event that started the fling. A `null` event indicates an incomplete event stream or error state.
`e2`	`MotionEvent`: The move motion event that triggered the current onFling. This value cannot be `null`.
`velocityX`	`float`: The velocity of this fling measured in pixels per second along the x axis.
`velocityY`	`float`: The velocity of this fling measured in pixels per second along the y axis.

Returns
`boolean`	true if the event is consumed, else false

onLongPress

Added in API level 1

public abstract void onLongPress (MotionEvent e)

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

Parameters
`e`	`MotionEvent`: The initial on down motion event that started the longpress. This value cannot be `null`.

onScroll

Added in API level 1

public 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. The distance in x and y is also supplied for convenience.

Parameters
`e1`	`MotionEvent`: The first down motion event that started the scrolling. A `null` event indicates an incomplete event stream or error state.
`e2`	`MotionEvent`: The move motion event that triggered the current onScroll. This value cannot be `null`.
`distanceX`	`float`: 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`	`float`: 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

onShowPress

Added in API level 1

public abstract void onShowPress (MotionEvent e)

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`	`MotionEvent`: The down motion event This value cannot be `null`.

onSingleTapUp

Added in API level 1

public abstract boolean onSingleTapUp (MotionEvent e)

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

Parameters
`e`	`MotionEvent`: The up motion event that completed the first tap This value cannot be `null`.

Returns
`boolean`	true if the event is consumed, else false