自定义ScrollView解决onScrollChanged()方法不能调用的问题

/**
* 自定义ScrollView解决onScrollChanged()方法不能调用的问题
*
* @author LENOVO
*
*/
public class MyScrollView extends ScrollView {

public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

public MyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public MyScrollView(Context context) {
super(context);
}

private ScrollViewListener scrollViewListener = null;

public void setScrollViewListener(ScrollViewListener scrollViewListener) {
this.scrollViewListener = scrollViewListener;
}

@Override
protected void onScrollChanged(int x, int y, int oldx, int oldy) {
super.onScrollChanged(x, y, oldx, oldy);
if (scrollViewListener != null) {
scrollViewListener.onScrollChanged(x, y, oldx, oldy);
}
}

public interface ScrollViewListener {
void onScrollChanged(int x, int y, int oldx,int oldy);
}

}