public
static
interface
GestureDetector.OnGestureListener
| android.view.GestureDetector.OnGestureListener |
 Known Indirect Subclasses
|
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.
Public methods | |
|---|---|
abstract
boolean
|
onDown(MotionEvent e)
Notified when a tap occurs with the down |
abstract
boolean
|
onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
Notified of a fling event when it occurs with the initial on down |
abstract
void
|
onLongPress(MotionEvent e)
Notified when a long press occurs with the initial on down |
abstract
boolean
|
onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
Notified when a scroll occurs with the initial on down |
abstract
void
|
onShowPress(MotionEvent e)
The user has performed a down |
abstract
boolean
|
onSingleTapUp(MotionEvent e)
Notified when a tap occurs with the up |
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.
|
| Returns | |
|---|---|
boolean |
|
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. |
e2 |
MotionEvent:
The move motion event that triggered the current onFling. |
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 |
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.
|
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. |
e2 |
MotionEvent:
The move motion event that triggered the current onScroll. |
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 |
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
|
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 |
| Returns | |
|---|---|
boolean |
true if the event is consumed, else false |
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