Android listview定位到上次显示的位置的实现方法

private int scrolledX = 0;
private int scrolledY = 0;

ClassesLV.setOnScrollListener(new OnScrollListener() {

/**
* 滚动状态改变时调用
*/

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {

}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
try {

　　scrolledX = view.getFirstVisiblePosition();
　　Log.i("scroll X", String.valueOf(scrolledX));
　　scrolledY = view.getChildAt(0).getTop();
　　Log.i("scroll Y", String.valueOf(scrolledY));
} catch (Exception e) {
}
}
}

//

});

public void onBack() {
　　ClassesLV.setSelectionFromTop(scrolledX, scrolledY);
}

protected void onResume() {
　　// ClassesLV.scrollTo(scrolledX, scrolledY);
　　onBack();
　　// initDataFromNet();
　　isClick = 0;
　　super.onResume();
}