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);

}

}

});