Question

如何通过动画自动停止滚动屏幕前面的项目。目前它可以使用以下代码，但滚动速度非常快。

所以我的要求是通过动画执行此操作，以便用户可以看到listview的滑动。

以下是我的代码，但我没有得到预期的结果。

listview.setOnScrollListener(new AbsListView.OnScrollListener() {

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                if (scrollState == SCROLL_STATE_IDLE) {
                    View child = layout.getChildAt(0);    // first visible child
                    Rect r = new Rect(0, 0, child.getWidth(), child.getHeight());     // set this initially, as required by the docs
                    double height = child.getHeight() * 1.0;
                    layout.getChildVisibleRect(child, r, null);
                    if (Math.abs(r.height()) != height)
                    {
                        //only smooth scroll when not scroll to correct position
                        if (Math.abs(r.height()) < height / 2.0)
                        {
                            listview.postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    listview.smoothScrollBy(listview.getFirstVisiblePosition(), 10000);
                                }
                            }, 500);
                        } else if (Math.abs(r.height()) > height / 2.0)
                        {
                            listview.postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    listview.smoothScrollBy(listview.getFirstVisiblePosition(), 10000);
                                }
                            }, 500);
                        } else
                        {

                            listview.postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    listview.smoothScrollBy(listview.getFirstVisiblePosition(),10000);
                                }
                            },500);

                        }

                    }
                }
            }

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

            }
        });

Answer 1

老问题，但仅供参考，这对我有用：

    if (condition) {
        // add stuff to begining of ListView and scroll up
        arrayList.add(0, stuff);
        listView.post(new Runnable() {
            @Override
            public void run() {
                listView.smoothScrollToPosition(0);
            }
        });
    } else {
        // add stuff to end of ListView and scroll down
        arrayList.add(index, stuff);
        listView.post(new Runnable() {
            @Override
            public void run() {
                listView.smoothScrollToPosition(adapter.getCount() - 1);
            }
        });
    }

基本上只是smoothScrollToPosition而不是smoothScrollBy。

如何执行动画列表视图滚动或限制滚动速度

1 个答案: