[英]Android View stops receiving touch events when parent scrolls
I have a custom Android view which overrides onTouchEvent(MotionEvent) to handle horizontal scrolling of content within the view. 我有一个自定义的Android视图,它覆盖了onTouchEvent(MotionEvent)来处理视图中内容的水平滚动。 However, when the ScrollView in which this is contained scrolls vertically, the custom view stops receiving touch events.
但是,当包含它的ScrollView垂直滚动时,自定义视图会停止接收触摸事件。 Ideally what I want is for the custom view to continue receiving events so it can handle its own horizontal scrolling, while the containing view hierarchy deals with vertical scrolling.
理想情况下,我想要的是自定义视图继续接收事件,以便它可以处理自己的水平滚动,而包含视图层次结构处理垂直滚动。
Is there any way to continue receiving those motion events on scroll? 有没有办法继续在滚动上接收这些动作事件? If not, is there any other way to get the touch events I need?
如果没有,有没有其他方法来获得我需要的触摸事件?
Use requestDisallowInterceptTouchEvent(true) in the childview to prevent from vertical scrolling if you want to continue doing horizontal scrolling and latter reset it when done. 在子视图中使用requestDisallowInterceptTouchEvent(true)以防止垂直滚动(如果要继续进行水平滚动,并在完成后重置它)。
private float downXpos = 0;
private float downYpos = 0;
private boolean touchcaptured = false;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
downXpos = event.getX();
downYpos = event.getY();
touchcaptured = false;
break;
case MotionEvent.ACTION_UP:
requestDisallowInterceptTouchEvent(false);
break;
case MotionEvent.ACTION_MOVE:
float xdisplacement = Math.abs(event.getX() - downXpos);
float ydisplacement = Math.abs(event.getY() - downYpos);
if( !touchcaptured && xdisplacement > ydisplacement && xdisplacement > 10) {
requestDisallowInterceptTouchEvent(true);
touchcaptured = true;
}
break;
}
super.onTouchEvent(event);
return true;
}
I'm answering my own question in case anyone else is as bad at Googling for the answer as I apparently was. 我正在回答我自己的问题,以防万一其他人在谷歌搜索中表现得很差,就像我显然那样。 :P
:P
A workaround for this problem is to extend ScrollView and override the onInterceptTouchEvent method so that it only intercepts touch events where the Y movement is significant (greater than the X movement, according to one suggestion). 此问题的解决方法是扩展ScrollView并覆盖onInterceptTouchEvent方法,以便它只截取Y移动很重要的触摸事件(根据一个建议,大于X移动)。
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