ScrollView with Buttons inside, no response until second click on any button inside

Question

I\'ve been a couple of days trying to solve this thing but I can\'t figure it out. The problem is, simple activity, with simple layout, ScrollView -> LinearLayout -> and a l

Answer 1

I have the same problem. I disagree that it's a fading scrollbar issue. If you disable the fading, the same thing happens.

Tried several approaches in themes.xml:

<item name="android:scrollbarDefaultDelayBeforeFade">100</item>
<item name="android:scrollbarFadeDuration">100</item>
<item name="android:fadeScrollbars">true</item>

But nothing helped. It seems that it's a system thing with scrollViews. This might help to see what's going on:

setOnScrollListener(new OnScrollListener(){
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
      // TODO Auto-generated method stub
    }
    public void onScrollStateChanged(AbsListView view, int scrollState) {
      // TODO Auto-generated method stub
      if(scrollState == 0) Log.i("a", "scrolling stopped...");
    }
  });
}

But that (unfortunately) doesn't help in overcoming the problem - but rather explaining it.

NOTE: this only happens if you use ScrollView. ListView doesn't have this problem.

Anyone has another idea ?

Answer 2

Everything is behaving normally.

When you start scrolling, the ScrollView will claim touch events until you stop touching the screen for a bit. In Android 2.2, you will know when scrolling is deemed complete, because the scrollbar on the right will fade away.

Answer 3

I've been able to fix this by overriding onScrollChanged, then sending the ScrollView a MotionEvent via OnTouchEvent when the bounds are reached to simulate a user touch.

It's the hackiest, dirtiest programming I can imagine, but it works ok in my application. This app is for phones running 2.2 only, and this bug needed to be fixed somehow.

If anyone has a better solution please let me know.

Edit: This problem is only in 2.2 btw, they've fixed it in 2.3, and it wasn't an issue in 2.1.

Answer 4

I got a situation like this. I have a ExpandableListView, it just behaves normally. When I rotate the cellphone to horizontal, and rotate back, then some items in one group of the ExpandableListView will not responding for click event. Unless I scroll the list view, or click the group item of these items, the event will dispatch to the items I clicked previously, and perform the click listener codes correctly.

This happened both in android 2.3 and 4.0...