android 偵測scroll事件的寫法
myLastVisiblePos放在全域變數
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| int myLastVisiblePos; | |
| gridView.setOnScrollListener(new AbsListView.OnScrollListener() { | |
| @Override | |
| public void onScrollStateChanged(AbsListView view, int scrollState) { | |
| if(scrollState ==AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) | |
| { | |
| //scroll start | |
| } | |
| if(scrollState ==AbsListView.OnScrollListener.SCROLL_STATE_IDLE) | |
| { | |
| //stop | |
| } | |
| } | |
| @Override | |
| public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { | |
| int currentFirstVisPos = view.getFirstVisiblePosition(); | |
| if(currentFirstVisPos > myLastVisiblePos) { | |
| //scroll down | |
| } | |
| if(currentFirstVisPos < myLastVisiblePos) { | |
| //scroll up | |
| } | |
| myLastVisiblePos = currentFirstVisPos; | |
| } | |
| }); |
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