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Added in API level 8

ScaleGestureDetector.OnScaleGestureListener

public static interface ScaleGestureDetector.OnScaleGestureListener

android.view.ScaleGestureDetector.OnScaleGestureListener
Known Indirect Subclasses


手势发生时接收通知的监听器。 如果你想听所有不同的手势然后实现这个接口。 如果你只想听一个子集,可能会更容易扩展ScaleGestureDetector.SimpleOnScaleGestureListener 应用程序将按以下顺序接收事件:

Summary

Public methods

abstract boolean onScale(ScaleGestureDetector detector)

响应正在进行的手势的缩放事件。

abstract boolean onScaleBegin(ScaleGestureDetector detector)

响应缩放手势的开始。

abstract void onScaleEnd(ScaleGestureDetector detector)

回应缩放手势的结尾。

Public methods

onScale

Added in API level 8
boolean onScale (ScaleGestureDetector detector)

响应正在进行的手势的缩放事件。 指针运动报告。

Parameters
detector ScaleGestureDetector: The detector reporting the event - use this to retrieve extended info about event state.
Returns
boolean Whether or not the detector should consider this event as handled. If an event was not handled, the detector will continue to accumulate movement until an event is handled. This can be useful if an application, for example, only wants to update scaling factors if the change is greater than 0.01.

onScaleBegin

Added in API level 8
boolean onScaleBegin (ScaleGestureDetector detector)

响应缩放手势的开始。 新指针报道下跌。

Parameters
detector ScaleGestureDetector: The detector reporting the event - use this to retrieve extended info about event state.
Returns
boolean Whether or not the detector should continue recognizing this gesture. For example, if a gesture is beginning with a focal point outside of a region where it makes sense, onScaleBegin() may return false to ignore the rest of the gesture.

onScaleEnd

Added in API level 8
void onScaleEnd (ScaleGestureDetector detector)

回应缩放手势的结尾。 现有指针正在上升。 一旦比例结束, getFocusX()getFocusY()将返回屏幕上剩余指针的焦点。

Parameters
detector ScaleGestureDetector: The detector reporting the event - use this to retrieve extended info about event state.

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