如何在 Android 中检测向左或向右滑动?

问题描述

我在 android 中有一个 EditText 视图.在此我想检测向左或向右滑动.我可以使用下面的代码在空白处获取它.但是当我在 EditText 上滑动时，这不起作用.我怎么做?如果我做错了什么，请告诉我.谢谢.

I have an EditText view in android. On this I want to detect swipe left or right. I am able to get it on an empty space using the code below. But this does not work when I swipe on an EditText. How do I do that? Please let me know If I am doing something wrong. Thank you.

使用的代码:

switch (touchevent.getAction())
{
    case MotionEvent.ACTION_DOWN:
    {
        oldTouchValue = touchevent.getX();
        break;
    }
    case MotionEvent.ACTION_UP:
    {
        float currentX = touchevent.getX();
        if (oldTouchValue < currentX)
        {
            // swiped left
        }
        if (oldTouchValue > currentX )
        {
            swiped right
        }
    break;
    }
}

推荐答案

最简单的从左到右滑动检测器:

在您的活动类中添加以下属性:

In your activity class add following attributes:

private float x1,x2;
static final int MIN_DISTANCE = 150;

并覆盖 onTouchEvent() 方法:

@Override
public boolean onTouchEvent(MotionEvent event)
{     
    switch(event.getAction())
    {
      case MotionEvent.ACTION_DOWN:
          x1 = event.getX();                          
      break;          
      case MotionEvent.ACTION_UP:
          x2 = event.getX();
          float deltaX = x2 - x1;
          if (Math.abs(deltaX) > MIN_DISTANCE)
          {
              Toast.makeText(this, "left2right swipe", Toast.LENGTH_SHORT).show ();
          }
          else
          {
              // consider as something else - a screen tap for example
          }                       
      break;    
    }            
    return super.onTouchEvent(event);        
}

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