Android 速度检测demo

package app.test;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.MotionEvent;import android.view.VelocityTracker;public class Test extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }    private VelocityTracker vTracker = null;    public boolean onTouchEvent(MotionEvent event) {        int action = event.getAction();        switch(action) {            case MotionEvent.ACTION_DOWN:                if(vTracker == null) {                    vTracker = VelocityTracker.obtain();                }                else {                    vTracker.clear();                }                vTracker.addMovement(event);                break;            case MotionEvent.ACTION_MOVE:                vTracker.addMovement(event);                vTracker.computeCurrentVelocity(1000);                Log.v("", "X velocity is " + vTracker.getXVelocity() +" pixels per second");                Log.v("", "Y velocity is " + vTracker.getYVelocity() +" pixels per second");                break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                vTracker.recycle();                break;        }        return true;    }}

vTracker.computeCurrentVelocity(1000)是设置计量单位，但是是毫秒。

vTracker.getXVelocity()

vTracker.getYVelocity()

得出来的值是多少像素每秒.

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