ListView兩級關聯

功能：右側滑動，左側同時關聯，并自行滾動至相應位置

實作：ListView

代碼：

/**
     * 處理父子產品與子子產品滑動、點選事件
     */
    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);
                    }
                }
            }
        });
    }

    /**
     * 處理父子產品視圖效果
     *
     * @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;
    }
           

處理資料，将左側資料在集合中的下标存儲起來，形成一個新的集合

在右側View onScroll 和ItemClick時通過下标來找到對應的左側item下标，使用listView.smoothScrollToPosition(postion)滾動至相應位置，

operateModuleView方法是處理選中的效果圖，因為ListView的Item複用的機制，是以在使用listView.getChildAt(postion)時，需要拿目前的postion-listView.getFirstVisiblePosition(),這樣可以保證，postion不在螢幕顯示之内，get的View也不會是空的。

listView滾動會偶現滾動位置不精确問題,請參考我的另一篇文章：

ListView smoothScrollToPositionFromTop 偶現滾動位置不精确問題解決辦法