问题描述
我在滚动视图中添加了一个滚动视图和子对象.在某些时候，我需要滚动到一个特定的视图.
I have added a scrollview and the subchilds inside the scrollview. At some point i need to scroll to a specific view.
<scrollview>
1. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
2. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
3. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
4. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
5. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
6. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
7. <linearlayout>
<textview></textview>
<textview></textview>
</linearlayout>
<button>
</button>
</scrollview>
以上布局是动态创建的.所以我不能在这里发布xml文件.布局创建是完全动态的.甚至线性布局内的子视图数量也可能会发生变化.
The above layout was created dynamically. so i can't have the xml file posted here. Layout creation is completely dynamic. Even the number of child view inside the linearlayout may also vary.
因此，当我单击按钮时，我需要滚动到特定视图，在这里单击按钮时，我需要滚动到线性布局4.我尝试了scrollTo方法，但它滚动到了scrollview的顶部.
So when i click on the button i need to get scrolled to a particular view say here when i click on button i need to scroll to the linear layout 4.I tried with the scrollTo method but it scrolls to the top of the scrollview.
请提供一些建议.
推荐答案
如果我们需要滚动到的孩子不是直接孩子，则上述解决方案将不起作用
If child that we need to scroll to is not a direct child then above solutions don't work
我在项目中使用了以下解决方案，与他人共享可能会有所帮助
I have used below solution in my project, sharing it may be helpful to others
/**
* Used to scroll to the given view.
*
* @param scrollViewParent Parent ScrollView
* @param view View to which we need to scroll.
*/
private void scrollToView(final ScrollView scrollViewParent, final View view) {
// Get deepChild Offset
Point childOffset = new Point();
getDeepChildOffset(scrollViewParent, view.getParent(), view, childOffset);
// Scroll to child.
scrollViewParent.smoothScrollTo(0, childOffset.y);
}
/**
* Used to get deep child offset.
* <p/>
* 1. We need to scroll to child in scrollview, but the child may not the direct child to scrollview.
* 2. So to get correct child position to scroll, we need to iterate through all of its parent views till the main parent.
*
* @param mainParent Main Top parent.
* @param parent Parent.
* @param child Child.
* @param accumulatedOffset Accumulated Offset.
*/
private void getDeepChildOffset(final ViewGroup mainParent, final ViewParent parent, final View child, final Point accumulatedOffset) {
ViewGroup parentGroup = (ViewGroup) parent;
accumulatedOffset.x += child.getLeft();
accumulatedOffset.y += child.getTop();
if (parentGroup.equals(mainParent)) {
return;
}
getDeepChildOffset(mainParent, parentGroup.getParent(), parentGroup, accumulatedOffset);
}
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