Android:如何创建 MotionEvent? [英] Android: How to create a MotionEvent?

问题描述

MotionEvent 没有构造函数，我想在我的单元测试中手动创建一个 MotionEvent，那么如何获得呢?谢谢.

MotionEvent doesn't get a constructor, I wanted to manually create a MotionEvent in my unit test, then how to get that? Thanks.

推荐答案

您应该使用 MotionEvent 类的静态 obtain 方法之一来创建新事件.

You should use one of the static obtain methods of the MotionEvent class to create a new event.

最简单的方法(除了从现有事件包装一个新事件)是:

The simplest way (besides wrapping a new event from an existing one) is:

static public MotionEvent obtain(long downTime, long eventTime, int action,
        float x, float y, int metaState) {

API 文档:

新建一个MotionEvent，填写一个基本运动值的子集.此处未指定的是:设备id(始终为 0)，压力和大小(总是 1)，x 和 y 精度(总是1) 和 edgeFlags(始终为 0).

Create a new MotionEvent, filling in a subset of the basic motion values. Those not specified here are: device id (always 0), pressure and size (always 1), x and y precision (always 1), and edgeFlags (always 0).

参数:

• downTime 时间(以毫秒为单位)用户最初按下启动位置事件流.这必须从SystemClock.uptimeMillis().
• eventTime 时间(以毫秒为单位)这个特定的事件产生了.这必须从SystemClock.uptimeMillis().
• action 正在执行的操作类型执行——其中之一ACTION_DOWN, ACTION_MOVE,ACTION_UP 或 ACTION_CANCEL.
• x 此事件的 X 坐标.
• y 此事件的 Y 坐标.
• metaState 任何元的状态/有效的修饰键事件发生的时间.

• downTime The time (in ms) when the user originally pressed down to start a stream of position events. This must be obtained from SystemClock.uptimeMillis().
• eventTime The the time (in ms) when this specific event was generated. This must be obtained from SystemClock.uptimeMillis().
• action The kind of action being performed -- one of either ACTION_DOWN, ACTION_MOVE, ACTION_UP, or ACTION_CANCEL.
• x The X coordinate of this event.
• y The Y coordinate of this event.
• metaState The state of any meta / modifier keys that were in effect when the event was generated.

API 文档链接

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