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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);
}
}
});
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