protected void onScrollChanged(int l, int t, int oldl, int oldt)

/**
* Created by 刘楠 on 2016/8/21 0021.17:24
*/
public interface ScrollViewListener {
void onScrollChanged(ObservableScrollView observableScrollView,int x,int y ,int oldx, int oldy);
}

package com.liu.titlealpha.view;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ScrollView;
/**
* Created by 刘楠 on 2016/8/21 0021.17:23
*/
public class ObservableScrollView extends ScrollView {
private ScrollViewListener mScrollViewListener=null;
public void setScrollViewListener(ScrollViewListener scrollViewListener) {
mScrollViewListener = scrollViewListener;
}
public ObservableScrollView(Context context) {
super(context);
}
public ObservableScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ObservableScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onScrollChanged(int x, int y, int oldx, int oldy) {
super.onScrollChanged(x, y, oldx, oldy);
if (mScrollViewListener != null) {
mScrollViewListener.onScrollChanged(this, x, y, oldx, oldy);
}
}
}