在自定义的ListView onInterceptTouchEvent [英] Custom onInterceptTouchEvent in ListView

问题描述

我如何能实现一个自定义的 onInterceptTouchEvent（）在的ListView ，让滚动优先考虑儿童的在的ListView ，并尽快为他们做了他们的滚动，还给了的ListView ？我想对内部的意见为主。

How can I implement a custom onInterceptTouchEvent() in a ListView that give the scrolling priority to the child's of the ListView and as soon as they did their scrolling , give it back to the ListView ? I want to give priority to the inner views.

推荐答案

尝试重写 onInterceptTouchEvent（）您的孩子是这样的：

Try overriding onInterceptTouchEvent() of your children like this:

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    if(!isAtTop && !isAtBottom){
        getParent().requestDisallowInterceptTouchEvent(true);   
    }             
    return super.onInterceptTouchEvent(ev);
} 

在 onInterceptTouchEvent（）计算，如果在ListView已经完全滚动到顶部或底部。如果它是介于两者之间则要求家长不要拦截触摸。

In onInterceptTouchEvent() calculate if the ListView has scrolled totally to the top or bottom. If it is somewhere in between then ask the parent to not intercept touches.

要检查顶部或底部的尝试：

To check for top or bottom try:

int scrollRange = computeVerticalScrollRange();
int scrollOffset = computeVerticalScrollOffset();
int scrollExtend = computeVerticalScrollExtent();
if(scrollOffset == 0){
    //AtTop
}else if(scrollRange == scrollOffset + scrollExtend){
    //AtBottom
}

这篇关于在自定义的ListView onInterceptTouchEvent的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！