How to detect how much the view has scroll ScrollView

Question

如何检测滚动视图滚动了多少？

Answer 1

You need to override the onScrollChanged() method of the ScrollView:

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {

    Log.i(TAG, "View onScrollChanged");
    View view = (View) getChildAt(getChildCount() - 1);
    int diff = (view.getBottom() - (getHeight() + getScrollY()));// Calculate

    super.onScrollChanged(l, t, oldl, oldt);
}

Here, diff is the space left for scrolling between the bottom edge of the ScrollView , and the currently visible content at the bottom. When diff = 0 , the ScrollView has been scrolled down fully.