如何反转 TextView 的选取框方向 [英] How to reverse the direction of marquee of a TextView

问题描述

我想在 TextView 中反转选取框的方向.默认情况下，文本从右向左移动，我希望它从左向右移动.我该怎么做?

I want to reverse the direction of marquee in the TextView. By default, the text moves from Right to Left, I want it to move from Left to Right. How can I do this?

推荐答案

我想出了一个非常简单易行的方法来做到这一点.我制作了一个选取框效果，根据我们的选择在两个方向上移动.所以，这是诀窍:

I figured out a very simple and easy way to do this. I made a marquee effect to move in both directions depending on our selection. So, here is the trick:

我在 Horizo​​ntalScrollView 中使用了 TextView.我以编程方式控制它的滚动.我使用以下方法获得了文本长度:

I used a TextView inside a HorizontalScrollView. I controlled its scrolling in a programmatic way. I got length of text using:

scroll_pos = (int)myTextView.getLayout().getLineWidth(0);

然后我使用 Handler 并递归调用它，直到达到滚动限制.在这个处理程序中，我让我的 Horizo​​ntalScrollView 滚动到某个位置:

Then I used Handler and called it recursively until I reach the scroll limit. In this handler I made my HorizontalScrollView to scroll to a certain position:

Handler hHandler = new Handler()
{
    @Override
    public void handleMessage(Message msg)
    {
        hScroll.scrollTo(scroll_pos, 0);
        scroll_pos--;
        if(scroll_pos >= 0)
            hHandler.sendEmptyMessage(0);
    }       
};

这里是从左到右的平滑选框.干杯！

And here it goes, a smooth marquee from Left to Right. Cheers!

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