我只是想在底部检测滚动nestedscrollview android的位置,以及调用函数。我的代码是:
scroll.getViewTreeObserver()
.addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
int totalHeight = scroll.getChildAt(0).getHeight();
int scrollY = scroll.getScrollY();
Log.v("position", "totalHeight=" + totalHeight + "scrollY=" + scrollY);
if (scrollY==totalHeight) {
getPlaylistFromServer("more");
}
}
});
但总高度与MAX ScrollY不同。怎么解决?
我知道现在已经很晚了..试试这种方式。
scroll.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
View view = (View) scroll.getChildAt(scroll.getChildCount() - 1);
int diff = (view.getBottom() - (scroll.getHeight() + scroll
.getScrollY()));
if (diff == 0) {
getPlaylistFromServer("more");
}
}
});
快乐编码..
Webserveis回答正确,但它需要在onScrollChange(覆盖方法)上进行一些更改,如下所示:
if (scrollY === v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight()) {
// end of the scroll view
}
科特林:
if (scrollY == v.getChildAt(0).measuredHeight - v.measuredHeight) {
// end of the scroll view
}
@Override
public void onScrollChange(NestedScrollView nestedScrollView, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
if (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1) != null) {
if ((scrollY >= (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1).getMeasuredHeight() - nestedScrollView.getMeasuredHeight())) &&
scrollY > oldScrollY) {
LogsUtils.INSTANCE.makeLogD(">onScrollChange>", ">>BOTTOm");
}
}
}
它为我工作,Source
对于api <23,你可以添加一个treeObserver.scrollChangeLister存储一个本地float变量并检查你的滚动方式是这样的
例
public class About extends AppCompatActivity implements
ViewTreeObserver.OnScrollChangedListener{
private float viewScrolled = 0;
nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(this);
}
@Override
public void onScrollChanged() {
if (viewScrolled < nestedScrollView.getScrollY()){
viewScrolled = nestedScrollView.getScrollY();
Log.d(TAG, "scrolling up");
}
if (viewScrolled > nestedScrollView.getScrollY()){
viewScrolled = nestedScrollView.getScrollY();
Log.d(TAG, "scrolling down");
}
}