适配器视图的自动滚动（列表视图，GridView的...） [英] Auto-scrolling of AdapterView (Listview, GridView,...)

问题描述

我试图让一个AdapterView（列表视图，GridView控件，...）慢慢地自动滚动。

I'm trying to make an AdapterView (listview, gridview,...) to slowly auto scroll .

只要他愿意，用户可以切换它，它不是所有的方式确实需要移动到适配器视图的结尾。

the user can toggle it whenever he wishes, and it doesn't necessary move all the way to the end of the adapterView.

再次，我不想让适配器视图一路滚动到底因为用户应该能够取消自动滚动。

again, i DO NOT wish to make the adapterView to scroll all the way to the bottom since the user should be able to cancel the auto-scrolling.

对于这一点，我使用的下一个code：

for this, i'm using the next code:

private static final SCROLLING_RUNNABLE = new Runnable() {

    @Override
    public void run() {
        final int duration = 10;
        final int pixelsToMove = 1;
        mAdapterView.smoothScrollBy(pixelsToMove, duration);
        mHandler.postDelayed(this, duration);
    }
};

...
// use this to turn auto-scrolling on:
mHandler.post(SCROLLING_RUNNABLE);
// use this to turn auto-scrolling off:
mHandler.removeCallbacks(SCROLLING_RUNNABLE);

问题

的 code通常工作，但在某些情况下，需要很长的时间，直到滚动开始

The problem

the code usually works, but on some cases, it takes a long time till the scrolling starts.

事实上，似乎我越开启和关闭，更多的我将不得不等待它来启动自动滚动。

in fact, it seems that the more i turn it on and off, the more i will have to wait for it to start auto-scrolling.

我想只有当我向后滚动顶端发生此问题。当适配器视图中滚动了一下它工作得很好。

i think this issue occurs only if i scroll back to the top. it works just fine when the adapterView is in scrolled a bit.

因为我不能找出如何让适配器视图当前的滚动值，我不能找出如何解决这个问题。

since i can't find out how to get the current scrolling value of the adapterView, i can't find out how to fix this issue.

我可以为了解决这个问题，怎么办？是否有其他选择吗？

What can I do in order to fix this issue ? Is there an alternative?

推荐答案

您可以开始滚动 SCROLLING_RUNNABLE.run（）;

更新
或者你可以使用动画：

UPDATE Or you can use animations:

Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                super.applyTransformation(interpolatedTime, t);
                // scroll the list
            }
        };

和 clearAnimation（）停止。

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