ScaleGestureDetector

Detects scaling transformation gestures using the supplied MotionEvents.

The android.view.ScaleGestureDetector.OnScaleGestureListener callback will notify users when a particular gesture event has occurred.

This class should only be used with MotionEvents reported via touch.

To use this class:

• Create an instance of the {@code ScaleGestureDetector} for your android.view.View

• In the android.view.View.onTouchEvent method ensure you call onTouchEvent. The methods defined in your callback will be executed when the events occur.