下面的屏幕快照说明了一个显示五个项目的列表视图，每个项目由两部分组成：A 和 B。列表视图最初显示这五个项目，默认情况下隐藏每个项目的 B 部分。用户应该能够单击 A 部分以显示或隐藏相应的 B 部分。如果用户点击第五个项目，我想将整个列表视图向上移动到 5 以上（包括 A 部分）以腾出空间第五项 B 部分。或者如果你想显示第四个项目的 B 部分，在点击第四个项目后我想向下移动项目 5 为项目 4 的 B 部分腾出空间。底线，如果我们点击一个项目，我们想要移动列表视图的位置，以确保我们有空间容纳新暴露的部分 B。
我知道这listview.setSelection(3)会将定位的项目滚动到列表的顶部。而且我也很熟悉listview.smoothScrollToPosition(8)，但是这个方法需要api 8，但是我们的项目使用的是版本7。
我在上述动画方面取得了一些进展，但无法确保列表视图项保持（或滚动）到正确的位置。当我扩展和收缩特定项目时，如何控制更广泛的列表视图的位置？
这是代码：
/**
* 类SubCategoryAdapter.java的实现描述：TODO 类实现描述
* @author xianyi.chengxy 2012-8-17 下午7:39:47
*/
public class SubCategoryAdapter extends BaseListAdapter<IndustryNavigationData> {
private Context mContext ;
private LayoutInflater mInflater ;
private ListView mListView ;
static String defaultName = "subCategory.png" ;
private int mPreVisiPosition = -1 ;
private int mVisiPosition = -1 ;
public SubCategoryAdapter( Context context , int visiPosition, ListView listView ){
super(context) ;
this.mContext = context.getApplicationContext() ;
this.mInflater = LayoutInflater.from(mContext) ;
this.mVisiPosition = visiPosition ;
this.mListView = listView ;
}
public void setVisiPosition(int visiPosition){
this.mVisiPosition = visiPosition ;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if( convertView == null ){
convertView = mInflater.inflate(R.layout.v2_subcategory_listitem, null) ;
NoScrollGridView gridView = (NoScrollGridView) convertView.findViewById(R.id.subCategory_groupView_gridView) ;
gridView.setNumColumns(5) ;
final BaseListAdapter<IndustryNavigationData> listAdapter = new SubCategoryGridViewAdapter(mContext) ;
gridView.setAdapter(listAdapter) ;
gridView.setTag(listAdapter) ;
ViewHold viewHold = new ViewHold() ;
viewHold.gridLayout = (LinearLayout) convertView.findViewById(R.id.subCategory_groupView_gridViewLayout) ;
viewHold.imageView = (ImageView_) convertView.findViewById(R.id.subCategory_groupView_imageview) ;
viewHold.name = (TextView) convertView.findViewById(R.id.subCategory_groupView_name) ;
viewHold.childsName = (TextView) convertView.findViewById(R.id.subCategory_groupView_childs) ;
viewHold.gridView = gridView ;
// TO search
viewHold.gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
UILogUtils.saveAndAppendLogType(LogTypeCode.APP_DRESSCATEGORY_BROWSER_TWO);
MyOfferRequest request = new MyOfferRequest();
IndustryNavigationData item = listAdapter.getItem(position);
if (IndustryNavigationDataType.LEFT_CATEGORY.equals(item
.getType())) {
request.setCategoryId(item.getId());
request.setCategoryName(item.getName());
} else if (IndustryNavigationDataType.LEFT_KEYWORD
.equals(item.getType())) {
request.setCategoryId(item.getId());
request.setKeywords(item.getName());
}
ActivityUtil.gotoSearchOfferList(request, mContext, true);
}
});
viewHold.groupLayout = convertView.findViewById(R.id.subCategory_groupLayout) ;
viewHold.groupLayout.setOnClickListener(clickListener) ;
convertView.setTag(viewHold) ;
}
ViewHold viewHold = (ViewHold) convertView.getTag() ;
viewHold.position = position ;
IndustryNavigationData item = group.get(position) ;
viewHold.groupLayout.setTag(viewHold) ;
String url = item.getImageUrl() ;
if( url != null ){
viewHold.imageView.setImageResource(item.getImageUrl(), 110, 110, R.drawable.default_image) ;
}
viewHold.name.setText( item.getName() );
StringBuffer sb = new StringBuffer() ;
List<IndustryNavigationData> childs = item.getChildren() ;
if( (childs!=null) && (childs.size()!=0) ){
for( IndustryNavigationData itemChild : item.getChildren() ){
sb.append(itemChild.getName()).append("/") ;
}
sb.deleteCharAt(sb.length()-1) ;
viewHold.childsName.setText(sb.toString()) ;
}else{
viewHold.childsName.setText("") ;
}
BaseListAdapter<IndustryNavigationData> gridViewAdapter = (BaseListAdapter<IndustryNavigationData>) viewHold.gridView.getTag() ;
gridViewAdapter.setList(item.getChildren()) ;
if( (this.mVisiPosition==position) && (item.getChildren()!=null) && (item.getChildren().size()!=0) ){
scrollView(viewHold, item, ExpandCollapseAnimation.EXPAND);
viewHold.gridLayout.setVisibility(View.VISIBLE) ;
}else{
if( position == this.mPreVisiPosition ){
// viewHold.gridLayout.setVisibility(View.GONE) ;
mPreVisiPosition = -1 ;
scrollView(viewHold, item, ExpandCollapseAnimation.COLLAPSE);
}else{
viewHold.gridLayout.setVisibility(View.GONE) ;
}
}
return convertView;
}
private class ViewHold{
public int position ;
public View groupLayout ;
public LinearLayout gridLayout ;
public ImageView_ imageView ;
public TextView name ;
public TextView childsName ;
public NoScrollGridView gridView ;
}
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
UILogUtils.saveAndAppendLogType(LogTypeCode.APP_DRESSCATEGORY_BROWSER_ONE);
ViewHold hold = (ViewHold) v.getTag() ;
if( (mVisiPosition!=hold.position) || (hold.gridLayout.getVisibility()!=View.VISIBLE) ){
mPreVisiPosition = mVisiPosition ;
mVisiPosition = hold.position ;
notifyDataSetChanged() ;
// scrollView(hold, getItem(mVisiPosition), ExpandCollapseAnimation.EXPAND) ;
// mListView.setSelection(mVisiPosition-1) ;
}else{
mPreVisiPosition = mVisiPosition ;
mVisiPosition = -1 ;
notifyDataSetChanged() ;
// notifyDataSetChanged() ;
}
}
};
/**
* @param viewHold
* @param item
*/
private void scrollView(ViewHold viewHold, IndustryNavigationData item, int scrollType) {
int childSize = item.getChildren().size() ;
int row = childSize / 5 ;
row = childSize%5==0? row:row+1 ;
LayoutParams lp = viewHold.gridLayout.getLayoutParams() ;
int heightDip = 37+(row-1)*13 ;
int heightPx = DisplayUtil.dipToPixel(heightDip)+row*98 ;
int time = heightPx*2 ;
lp.height = heightPx ;
viewHold.gridLayout.setLayoutParams(lp) ;
viewHold.gridLayout.startAnimation(new ExpandCollapseAnimation(viewHold.gridLayout, time, scrollType, mListView, viewHold.position));
}
}