What is Gesture in Android Phone ?

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Android provides special types of touch screen events such as pinch, double tap, scrolls, long presses and flinch. These are all known as gestures.

What is Gesture in Android Phone ?


Android provides Gesture Detector class to receive motion events and tell us that these events correspond to gestures or not. To use it, you need to create an object of GestureDetector and then extend another class with GestureDetector.


SimpleOnGestureListener to act as a listener and override some methods.


GestureDetector myG;
myG = new GestureDetector(this,new Gesture());
  
class Gesture extends GestureDetector.SimpleOnGestureListener{

   public boolean onSingleTapUp(MotionEvent ev) {
   }
  
   public void onLongPress(MotionEvent ev) {
   }
  

   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
   float distanceY) {
   }
  
   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

   float velocityY) {
   }
}


Method & description


  1. get EventTime() This method gets the event time of the current event being processed.
  2. get FocusX() This method gets the X coordinate of the current gesture's focal point.
  3. get focused() This method gets the Y coordinate of the current gesture's focal point.
  4. get TimeDelta() This method returns the time difference in milliseconds between the previous accepted scaling event and the current scaling event.
  5. is In Progress() This method returns true if a scale gesture is in progress.
  6. on TouchEvent (MotionEvent event) This method accepts MotionEvents and dispatches events when appropriate.
What is Gesture in Android Phone


Example

Here is an example demonstrating the use of ScaleGestureDetector class. It creates a basic application that allows you to zoom in and out through pinch. To experiment with this example, you can run this on an actual device or in an emulator with touch screen enabled.


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What is Gesture in Android Phone ?
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