【UI】【View】MotionEvent类详解

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本文将详细讲解MotionEvent类的一些成员和方法。
了解MotionEvent，可以更好地了解控件的一些特效，如拖动控件或多点缩放控件。同时，掌握MotionEvent类也是学好android触控技术的基础。

一、MotionEvent常见的常量

1）单点动作

ACTION_DOWN

A pressed gesture has started, the motion contains the initial starting location.

public static final int ACTION_DOWN = 0; 单点触摸动作

ACTION_UP

A pressed gesture has finished, the motion contains the final release location as well as any

intermediate points since the last down or move event.

public static final int ACTION_UP = 1;单点触摸离开动作

ACTION_OUTSIDE

A movement has happened outside of the normal bounds of the UI element.

public static final int ACTION_OUTSIDE= 4;触摸动作超出边界

ACTION_CANCEL

The current gesture has been aborted

public static final int ACTION_CANCEL = 3;触摸动作取消.

ACTION_MOVE

A change has happened during a press gesture (between ACTION_DOWN and ACTION_UP).

public static final int ACTION_MOVE= 2;触摸点移动动作

2）多点动作

ACTION_POINTER_DOWNpublic static final int ACTION_POINTER_DOWN = 5; 多点触摸动作 ACTION_POINTER_UP public static final int ACTION_POINTER_UP = 6; 多点离开动作

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