GestureDetector手势识别类 - 入门篇

程序语言 Java
1

对于Android设备来说最主要的操作方式为触控，作为一个Android开发者来说深入了解 GestureDetector 手势识别是很有必要的，Android123今天主要介绍下该类相关的方法，以及简单的手势识别。

通常我们构造GestureDetector类时设置一个GestureDetector.OnGestureListener对象来实时监控用户的操作，OnGestureListener对象提供一些常见手势的重写方法。

@Override  
public boolean onDown(MotionEvent e) {   
  //按下事件

    return true;   
}   
  
@Override  
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {   
 //快速滚动

    return true;   
}   
  
@Override  
public void onLongPress(MotionEvent e) {   
    //长按

}   
  
@Override  
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {   
 //常规滚动

    return true;   
}   
  
@Override  
public void onShowPress(MotionEvent e) {   
   //Android开发网提示为了产生理解异议，SDK原文为 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

}       
  
@Override  
public boolean onSingleTapUp(MotionEvent e) {   
   //一次按下弹起

    return true;   
}