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Android - ScrollView添加提示Arrow(箭头)
ScrollView添加提示Arrow(箭头)
本文地址:http://blog.csdn.net/caroline_wendy
在ScrollView的滑动功能中,需要给用户提示,可以滑动,可以添加两个箭头。
定制ScrollView,创建监听器IScrollStateListener接口:
private IScrollStateListener scrollStateListener; public void setScrollStateListener(IScrollStateListener listener) { scrollStateListener = listener; } public interface IScrollStateListener { void onScrollMostLeft(); void onScrollFromMostLeft(); void onScrollMostRight(); void onScrollFromMostRight(); }
在监听滑动的时候,调用监听滑动事件(onScrollChanged):
@Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); if (scrollStateListener != null) { if (l == 0) { scrollStateListener.onScrollMostLeft(); } else if (oldl == 0) { scrollStateListener.onScrollFromMostLeft(); } int mostRightL = this.getChildAt(0).getWidth()-getWidth(); if (l >= mostRightL) { scrollStateListener.onScrollMostRight(); } else if (oldl >= mostRightL && l < mostRightL) { scrollStateListener.onScrollFromMostRight(); } } }
在使用滑动条时,给监听事件,传递具体事务:
final ImageView leftArrow = (ImageView)view.findViewById(R.id.doctor_gather_imageview_leftarrow); final ImageView rightArrow = (ImageView)view.findViewById(R.id.doctor_gather_imageview_rightarrow); AutoHorizontalScrollView scrollView = (AutoHorizontalScrollView)view.findViewById(R.id.doctor_gather_scrollview); scrollView.setScrollStateListener(new AutoHorizontalScrollView.IScrollStateListener() { @Override public void onScrollMostLeft() { Log.e(DEBUG + TAG, "滑动条最左面"); leftArrow.setVisibility(View.INVISIBLE); rightArrow.setVisibility(View.VISIBLE); } @Override public void onScrollFromMostLeft() { Log.e(DEBUG+TAG, "滑动条离开最左面"); leftArrow.setVisibility(View.VISIBLE); rightArrow.setVisibility(View.VISIBLE); } @Override public void onScrollMostRight() { Log.e(DEBUG+TAG, "滑动条最右面"); leftArrow.setVisibility(View.VISIBLE); rightArrow.setVisibility(View.INVISIBLE); } @Override public void onScrollFromMostRight() { Log.e(DEBUG+TAG, "滑动条离开最右面"); leftArrow.setVisibility(View.VISIBLE); rightArrow.setVisibility(View.VISIBLE); } });
即可。
参考:http://stackoverflow.com/questions/9062227/how-to-set-images-for-scrollview-instead-of-fading-edges
Android - ScrollView添加提示Arrow(箭头)
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