ScrollView的滑动监听(以HorizontalScro

ScrollView不能像其他组件一样使用onScrollChanged()方法是因为它用protected封装了

protected void onScrollChanged(int x, int y, int oldx, int oldy);  

想要实现监听需要简单自定义组件.
1:自定义组件

public class ObservableScrollView extends HorizontalScrollView {  
  
    private ScrollViewListener scrollViewListener = null;  
  
    public ObservableScrollView(Context context) {  
        super(context);  
    }  
  
    public ObservableScrollView(Context context, AttributeSet attrs,  
                                int defStyle) {  
        super(context, attrs, defStyle);  
    }  
  
    public ObservableScrollView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
    }  
  
    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(this, x, y, oldx, oldy);  
        }  
    }  
  
}  

接口:

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

2:使用监听

horizontalScrollView.setScrollViewListener(new ScrollViewListener() {//滑动监听,获取图片  
               @Override  
               public void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy) {  
                   int scrollX = scrollView.getScrollX();  
                   int width = scrollView.getWidth();  
                   int scrollViewMeasuredWidth = holder.imageSL.getChildAt(0).getMeasuredWidth();  
                   if ((scrollX + width) == scrollViewMeasuredWidth) {  
/                        System.out.println("滑动到了底部 scrollY=" + scrollX + "height=" + width + "scrollViewMeasuredHeight=" + scrollViewMeasuredWidth);  
                   }  
               }  
           });