Android--记录和恢复listView滚动位置的3种方法 (20

有时在view切换时，需要恢复listView之前滚动到的位置，常用的三种方法如下：

1、记录listView滚动到的位置的坐标，然后利用listView.scrollTo精确的进行恢复
listView.setOnScrollListener(new OnScrollListener() {

            @Override

            public void onScrollStateChanged(AbsListView view, int scrollState) {

               

                if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {

                    if (currentMenuInfo!=null)         {

                        scrolledX = listView.getScrollX();

                        scrolledY = listView.getScrollY();

                    }

                }

            }

            @Override

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

               

            }

        });

在恢复位置时调用：

listView.scrollTo(scrolledX, scrolledY);

 

2、记录listView显示在屏幕上的第一个item的位置，然后利用listView.setSelection恢复

listView.setOnScrollListener(new OnScrollListener() {

            @Override

            public void onScrollStateChanged(AbsListView view, int scrollState) {

                if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {

                    position = listView.getFirstVisiblePosition();

                }

            }

            @Override

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

            }

        });

</pre><p style="margin-top: 0px; margin-bottom: 5px; padding-top: 0px; padding-bottom: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21.600000381469727px;"><span style="background-color: rgb(255, 204, 102);">在恢复位置时调用：</span></p><pre name="code" style="white-space: normal;"><span style="background-color: rgb(255, 204, 102);">listView.setSelection(position);</span>

3、通知listView的适配器数据变更

这种适用于listView追加数据的情况，严格说不是恢复listView滚动的位置，只是保持滚动位置不错

<span style="background-color: rgb(255, 204, 102);">listDataAdapter.getDataList.addAll(newDataList()); 
listDataAdapter.notifyDataSetChanged();</span>