速度或运动赛事的android加速 [英] speed or acceleration of motion event android

问题描述

是否有可能获得速度或Android的速度或触摸事件的加速与现有的API？我已经通过MotionEvent类了，没有在类中的字段似乎找回我需要的信息。任何帮助将大大AP preciated

Is it possible to get the speed or velocity or acceleration of touch event in android with the existing api? I have gone through MotionEvent class and none of the fields in that class seem to retrieve information that i need. Any help would be greatly appreciated

推荐答案

MotionEvent不帮你在这种情况下。您可以使用VelocityTracker类。它得到MotionEvent的实例，并计算最近触摸事件的速度。
你可以在这里看看它的文档：
<一href=\"http://developer.android.com/reference/android/view/VelocityTracker.html\">http://developer.android.com/reference/android/view/VelocityTracker.html

MotionEvent does not help you in this case. You can use VelocityTracker class. It gets MotionEvent instances and calculates velocity of recent touch events. You can take a look at its documentation here: http://developer.android.com/reference/android/view/VelocityTracker.html

首先，你必须得到一个实例获得通过（）方法：

First you have to get an instance by obtain() method:

VelocityTracker velocity = VelocityTracker.obtain();

然后你可以添加ACTION_MOVE事件，它的队列：

then you can add ACTION_MOVE events to its queue:

    if(event.getAction() == MotionEvent.ACTION_MOVE)
    {
        velocity.addMovement(event);
    }

然后就可以计算出速度和提取x_velocity和y_velocity

then you can compute velocity and extract x_velocity and y_velocity

velocity.computeCurrentVelocity(1000);
float x_velocity = velocity.getXVelocity();
float y_velocity = velocity.getYVelocity();

我希望它为你工作。

I hope it works for you.

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