触摸cutom视图时不要滚动ListView

I've created a custom view on which you can draw a path with your finger. It extends View class.

我创建了一个自定义视图,您可以用手指绘制路径。它扩展了View类。

When I use it inside a ListView as one of its items if a user touches custom view the ListView is scrolled. How can I prevent this from happening?

当我在ListView中使用它作为其项目之一时,如果用户触摸自定义视图,则滚动ListView。我怎样才能防止这种情况发生?

I suppose I need to get focus somehow on my custom view. But I don't know how.

我想我需要以某种方式在我的自定义视图上获得焦点。但我不知道怎么做。

Update:

I found possible solution. In my custom view's onTouchEvent(Motion event) method I've placed getParent().requestDisallowInterceptTouchEvent(true);.

我发现可能的解决方案在我的自定义视图的onTouchEvent(Motion事件)方法中,我放置了getParent()。requestDisallowInterceptTouchEvent(true);.

Without this the event queue when user touches custom view looked like this:

如果没有这个,当用户触摸自定义视图时,事件队列如下所示:

MotionEvent.ACTION_DOWN
MotionEvent.ACTION_MOVE
MotionEvent.ACTION_MOVE
MotionEvent.ACTION_CANCEL

When I receive MotionEvent with code MotionEvent.ACTION_CANCEL the ListView starts to scroll.

当我使用代码MotionEvent.ACTION_CANCEL接收MotionEvent时,ListView开始滚动。

2 个解决方案

#1

Setting requestDisallowInterceptTouchEvent(true) within child's onTouch(View, MotionEvent) method works:

在child的onTouch(View,MotionEvent)方法中设置requestDisallowInterceptTouchEvent(true)可以正常工作:

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewGroup item = (ViewGroup) inflater.inflate(R.layout.list_item, null);
        Button button = (Button)item.findViewById(R.id.list_item_btn);
        button.setText("button " + position);

        button.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                listView.requestDisallowInterceptTouchEvent(true);
                return false;
            }

        });

        return item;
    }

#2

I think u should also extend the ListView widget .

我想你也应该扩展ListView小部件。

As u say ,when u touch the custom view ,the listview will scroll.
when u touch the custom view, the touch event will dispatch along the view hierarchy ,
I think listview may eat the touch event.
so ur customview can not receive the touch event.
if ur have not understand the dispatch of the touch event.
u can read this Managing Touch Events in a ViewGroup

正如您所说,当您触摸自定义视图时,列表视图将滚动。当你触摸自定义视图时,触摸事件将沿着视图层次结构调度,我认为listview可能会吃掉触摸事件。所以你的customview无法接收触摸事件。如果你不理解触摸事件的发送。你可以在ViewGroup中阅读这个管理触摸事件

at last.
I suggest u extend the ListView and override the onInterceptTouchEvent() method.
u can decide if ur ListView want to handle the touch event in the onInterceptTouchEvent().
when u judge the touch should be handle by the drawPathView,
u can let the ListView dont intercept it.
so ur drawPathView can get the toch event .
and also the listView will not scroll

最后。我建议你扩展ListView并覆盖onInterceptTouchEvent()方法。你可以决定你的ListView是否想要处理onInterceptTouchEvent()中的触摸事件。当你判断触摸应该由drawPathView处理时,你可以让ListView不要拦截它。所以你的drawPathView可以得到toch事件。而且listView也不会滚动

#1