ListView两级联动

功能：右侧滑动，左侧同时联动，并自行滚动至相应位置

实现：ListView

代码：

/**
* 处理父模块与子模块滑动、点击事件
*/
private void operate() {
livModule.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

moduleItemClick = true;

operateModuleView(view, position);

int total = 0;
for (int i = 0; i < position; i++) {
total += i == position ? 1 : mModuleList.get(i).getForumlist().size();
}
mScrollPstion = mModuleChildList.size() * (livModuleChild.getFirstVisiblePosition() / mModuleChildList.size()) + total;
livModuleChild.smoothScrollToPositionFromTop(mScrollPstion,
0, 300);
}
});
livModuleChild.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == SCROLL_STATE_TOUCH_SCROLL)
moduleItemClick = false;
if (scrollState == SCROLL_STATE_IDLE && moduleItemClick)
if (livModuleChild.getFirstVisiblePosition() != mScrollPstion)
livModuleChild.smoothScrollToPositionFromTop(mScrollPstion,
0, 300);
}

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

if (moduleItemClick)
return;

ModuleChildAdapter mModuleChildAdapter = (ModuleChildAdapter) (view.getAdapter() instanceof Adapter ? view.getAdapter() : null);

if (null != mModuleChildAdapter
&& visibleItemCount > 0
&& mModuleChildAdapter.mdata.size() > 0) {

SelectModuleChildBean.ForumlistEntity mForumlistEntities =
(SelectModuleChildBean.ForumlistEntity) mModuleChildAdapter.getItem(firstVisibleItem % mModuleChildAdapter.mdata.size());

if (null != mForumlistEntities
&& !TextUtils.isEmpty(mForumlistEntities.getmIndex())
&& livModule.getAdapter().getCount() > 0) {

int index = Integer.parseInt(mForumlistEntities.getmIndex());
livModule.smoothScrollToPosition(index);
operateModuleView(livModule.getChildAt(index - livModule.getFirstVisiblePosition()), index);
}
}
}
});
}

/**
* 处理父模块视图效果
*
* @param mView
* @param index
*/
private void operateModuleView(View mView, int index) {
mModuleAdapter.setcIndex(index);
if (mLaseIndex != -1 && mLaseIndex != index) {
if (mLaseIndex != 0 && null != livModule.getChildAt(mLaseIndex - livModule.getFirstVisiblePosition() - 1))
livModule.getChildAt(mLaseIndex - livModule.getFirstVisiblePosition() - 1).findViewById(R.id.view_bottom).setVisibility(View.VISIBLE);
View mLView = livModule.getChildAt(mLaseIndex - livModule.getFirstVisiblePosition());
if (null != mLView) {
View view_left = mLView.findViewById(R.id.view_left);
if (null != view_left)
view_left.setVisibility(View.INVISIBLE);

View mTextView = mLView.findViewById(R.id.txt_module_name);
if (null != mTextView && mTextView instanceof TextView)
((TextView) mTextView).setTextColor(defColor);
}
}
if (mView != null) {
View view_left = mView.findViewById(R.id.view_left);
if (null != view_left)
view_left.setVisibility(View.VISIBLE);

View mTextView = mView.findViewById(R.id.txt_module_name);
if (null != mTextView && mTextView instanceof TextView)
((TextView) mTextView).setTextColor(selColor);
}
mLaseIndex = index;
}

处理数据，将左侧数据在集合中的下标存储起来，形成一个新的集合

在右侧View onScroll 和ItemClick时通过下标来找到对应的左侧item下标，使用listView.smoothScrollToPosition(postion)滚动至相应位置，

operateModuleView方法是处理选中的效果图，因为ListView的Item复用的机制，所以在使用listView.getChildAt(postion)时，需要拿当前的postion-listView.getFirstVisiblePosition(),这样可以保证，postion不在屏幕显示之内，get的View也不会是空的。

listView滚动会偶现滚动位置不精确问题,请参考我的另一篇文章：

ListView smoothScrollToPositionFromTop 偶现滚动位置不精确问题解决办法