我有一个很长的带有滚动视图的活动。它是一个包含用户必须填写的各种字段的表单。我在表单的中间有一个复选框,当用户选中它时,我想滚动到视图的特定部分。是否有办法以编程方式滚动到EditText对象(或任何其他视图对象)?
此外,我知道这是可能的使用X和Y坐标,但我想避免这样做,因为形式可能会从用户到用户的变化。
我有一个很长的带有滚动视图的活动。它是一个包含用户必须填写的各种字段的表单。我在表单的中间有一个复选框,当用户选中它时,我想滚动到视图的特定部分。是否有办法以编程方式滚动到EditText对象(或任何其他视图对象)?
此外,我知道这是可能的使用X和Y坐标,但我想避免这样做,因为形式可能会从用户到用户的变化。
当前回答
问:有没有一种方法,以编程方式滚动滚动视图到特定的编辑文本?
答:嵌套滚动视图在recyclerview最后位置添加记录数据。
adapter.notifyDataSetChanged();
nested_scroll.setScrollY(more Detail Recycler.getBottom());
是否有一种方法以编程方式滚动滚动视图到特定的编辑文本?
其他回答
以下是我正在使用的:
int amountToScroll = viewToShow.getBottom() - scrollView.getHeight() + ((LinearLayout.LayoutParams) viewToShow.getLayoutParams()).bottomMargin;
// Check to see if scrolling is necessary to show the view
if (amountToScroll > 0){
scrollView.smoothScrollTo(0, amountToScroll);
}
这将获得显示视图底部所需的滚动量,包括视图底部的任何边距。
我认为我已经找到了更优雅、更不容易出错的解决方案
ScrollView.requestChildRectangleOnScreen
它不涉及数学运算,与其他提出的解决方案相反,它将正确地处理上下滚动。
/**
* Will scroll the {@code scrollView} to make {@code viewToScroll} visible
*
* @param scrollView parent of {@code scrollableContent}
* @param scrollableContent a child of {@code scrollView} whitch holds the scrollable content (fills the viewport).
* @param viewToScroll a child of {@code scrollableContent} to whitch will scroll the the {@code scrollView}
*/
void scrollToView(ScrollView scrollView, ViewGroup scrollableContent, View viewToScroll) {
Rect viewToScrollRect = new Rect(); //coordinates to scroll to
viewToScroll.getHitRect(viewToScrollRect); //fills viewToScrollRect with coordinates of viewToScroll relative to its parent (LinearLayout)
scrollView.requestChildRectangleOnScreen(scrollableContent, viewToScrollRect, false); //ScrollView will make sure, the given viewToScrollRect is visible
}
如果ScrollView正在被更改,那么将它封装到postDelayed中以使其更加可靠是个好主意
/**
* Will scroll the {@code scrollView} to make {@code viewToScroll} visible
*
* @param scrollView parent of {@code scrollableContent}
* @param scrollableContent a child of {@code scrollView} whitch holds the scrollable content (fills the viewport).
* @param viewToScroll a child of {@code scrollableContent} to whitch will scroll the the {@code scrollView}
*/
private void scrollToView(final ScrollView scrollView, final ViewGroup scrollableContent, final View viewToScroll) {
long delay = 100; //delay to let finish with possible modifications to ScrollView
scrollView.postDelayed(new Runnable() {
public void run() {
Rect viewToScrollRect = new Rect(); //coordinates to scroll to
viewToScroll.getHitRect(viewToScrollRect); //fills viewToScrollRect with coordinates of viewToScroll relative to its parent (LinearLayout)
scrollView.requestChildRectangleOnScreen(scrollableContent, viewToScrollRect, false); //ScrollView will make sure, the given viewToScrollRect is visible
}
}, delay);
}
另一种说法是:
scrollView.postDelayed(new Runnable()
{
@Override
public void run()
{
scrollView.smoothScrollTo(0, img_transparent.getTop());
}
}, 200);
或者可以使用post()方法。
参考资料:https://stackoverflow.com/a/6438240/2624806
接下来的工作要好得多。
mObservableScrollView.post(new Runnable() {
public void run() {
mObservableScrollView.fullScroll([View_FOCUS][1]);
}
});
我基于WarrenFaith的答案做了一个小工具方法,这段代码也考虑了视图是否已经在滚动视图中可见,不需要滚动。
public static void scrollToView(final ScrollView scrollView, final View view) {
// View needs a focus
view.requestFocus();
// Determine if scroll needs to happen
final Rect scrollBounds = new Rect();
scrollView.getHitRect(scrollBounds);
if (!view.getLocalVisibleRect(scrollBounds)) {
new Handler().post(new Runnable() {
@Override
public void run() {
scrollView.smoothScrollTo(0, view.getBottom());
}
});
}
}