Android:如何创建MotionEvent?

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

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。

2 个解决方案

#1

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

您应该使用MotionEvent类的一个静态获取方法来创建一个新事件。

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

最简单的方法(除了从现有事件包装新事件之外)是:

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

API Docs:

API文档:

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).

创建一个新的MotionEvent，填充基本运动值的子集。这里没有指定的是:设备id(总是0)、压力和大小(总是1)、x和y精度(总是1)和边缘标记(总是0)。

Parameters:

参数:

• 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().
• 停机时间:用户最初按下按钮启动位置事件流的时间(以ms为单位)。这必须从SystemClock.uptimeMillis()获得。
• eventTime The the time (in ms) when this specific event was generated. This must be obtained from SystemClock.uptimeMillis().
• eventTime:生成此特定事件时的时间(以ms为单位)。这必须从SystemClock.uptimeMillis()获得。
• action The kind of action being performed -- one of either ACTION_DOWN, ACTION_MOVE, ACTION_UP, or ACTION_CANCEL.
• 操作正在执行的操作类型——一个是ACTION_DOWN、ACTION_MOVE、ACTION_UP或ACTION_CANCEL。
• x The X coordinate of this event.
• x是这个事件的x坐标。
• y The Y coordinate of this event.
• y是这个事件的y坐标。
• metaState The state of any meta / modifier keys that were in effect when the event was generated.
• 转移事件生成时生效的任何元/修饰符键的状态。

Link to API Docs

链接到API文档

#2

Supplemental answer

Here is an example illustrating the accepted answer:

下面是一个例子，说明了公认的答案:

// get the coordinates of the view
int[] coordinates = new int[2];
myView.getLocationOnScreen(coordinates);

// MotionEvent parameters
long downTime = SystemClock.uptimeMillis();
long eventTime = SystemClock.uptimeMillis();
int action = MotionEvent.ACTION_DOWN;
int x = coordinates[0];
int y = coordinates[1];
int metaState = 0;

// dispatch the event
MotionEvent event = MotionEvent.obtain(downTime, eventTime, action, x, y, metaState);
myView.dispatchTouchEvent(event);

Notes

• Other meta states include things like KeyEvent.META_SHIFT_ON, etc.
• 其他元状态包括KeyEvent。META_SHIFT_ON等等。
• Thanks to this answer for help with the example.
• 感谢这个示例的帮助。