无限自动滚动的ListView与滚动速度控制 [英] Infinite Auto Scroll ListView with Scroll Speed Controlled

问题描述

我一直在那里一直没有用户交互自动滚动的ListView 的想法，这是绝对可行例如使用了Android的API smoothScrollToPositionFromTop 的

我已实施的ListView BaseAdapter 它加载的项目永远（几乎）得到一个非停止自我重复的ListView

我想在这里实现的是让我的的ListView 以一定的速度（慢），使项目清晰可读永远的滚动而滚动下来，我还不确定是否的ListView 是我最好的选择在这里。

下面是什么，我试图做一个片段。结果是有点好，但它不够光滑，我能感觉到的ListView闪烁。

我需要提高的平滑度，效率和控制速度

 新主题（新的Runnable（）{    @覆盖
    公共无效的run（）{
        INT listViewSize = mListView.getAdapter（）getCount将（）。        对于（INT指数= 0;指数 -  LT; listViewSize;指数++）{
            mListView.smoothScrollToPositionFromTop（mListViewA.getLastVisiblePosition（）+ 100，0，6000）;
            尝试{
                //它有助于滚动保持顺利地进行（通过实验）
                视频下载（60）;
            }赶上（InterruptedException的E）{            }
        }
    }
}）。开始（）;
 

解决方案

我建议，thath适配器有效方式实现。
所以这code只是滚动列表视图

你需要尝试的另一个变量的值

 最终长totalScrollTime = Long.MAX_VALUE; //总滚动的时间。我认为300 000 000年代是接近enouth到无穷远。如果没有足够多的你可以onFinish重启定时器（）最终诠释scrollPeriod = 20; //每20毫秒scoll意志发生了。流畅的较小值最终诠释heightToScroll = 20; //将滚动到每次20像素。流畅滚动较小的值listView.post（新的Runnable（）{
                        @覆盖
                        公共无效的run（）{
                                新CountDownTimer（totalScrollTime，scrollPeriod）{
                                    公共无效onTick（长millisUntilFinished）{
                                        listView.scrollBy（0，heightToScroll）;
                                    }                                公共无效onFinish（）{
                                    //你可以添加code在这里重新开始计时
                                }
                            }。开始（）;
                        }
                    }）;
 

I have been working on a ListViewidea where it keeps scrolling automatically with no user interaction and that is absolutely doable using the android APIs for instance smoothScrollToPositionFromTop.

I have implemented ListView BaseAdapter where it load items forever (almost) to get a non stopping self repeated ListView.

What I want to achieve here is to keep myListViewscrolling forever with certain speed (slow) to make items clear and readable while scrolling down, I not sure yet if ListView is my best choice here.

below is a snippet of what I am trying to do. the result is good somehow but it's not smooth enough, I can feel the ListView flickers.

I need to improve smoothness, efficiency and control the speed

new Thread(new Runnable() {

    @Override
    public void run() {
        int listViewSize = mListView.getAdapter().getCount();

        for (int index = 0; index < listViewSize ; index++) {
            mListView.smoothScrollToPositionFromTop(mListViewA.getLastVisiblePosition() + 100, 0, 6000);
            try {
                // it helps scrolling to stay smooth as possible (by experiment)
                Thread.sleep(60);
            } catch (InterruptedException e) {

            }
        }
    }
}).start();

解决方案

I suggest, thath your adapter implemented in effective way. so this code is just scrolls listview

you need to try another values of variables

final long totalScrollTime = Long.MAX_VALUE; //total scroll time. I think that 300 000 000 years is close enouth to infinity. if not enought you can restart timer in onFinish()

final int scrollPeriod = 20; // every 20 ms scoll will happened. smaller values for smoother

final int heightToScroll = 20; // will be scrolled to 20 px every time. smaller values for smoother scrolling

listView.post(new Runnable() {
                        @Override
                        public void run() {
                                new CountDownTimer(totalScrollTime, scrollPeriod ) {
                                    public void onTick(long millisUntilFinished) {
                                        listView.scrollBy(0, heightToScroll);
                                    }

                                public void onFinish() {
                                    //you can add code for restarting timer here
                                }
                            }.start();
                        }
                    });

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