如何扩展/调整文本以适应一个TextView？ [英] How to scale/resize text to fit a TextView?

问题描述

我试图创建一个的TextView 这样的调整多行文本，它的范围内适合的方法（包括X和Y尺寸）的的TextView 。

I'm trying to create a method for resizing multi-line text in a TextView such that it fits within the bounds (both the X and Y dimensions) of the TextView.

在present，我有一些，但是它的作用是调整这样的，只是第一个字母/文本字符填充的尺寸的文字的TextView （即第一个字母是可见的，这是巨大的）。我需要它来TextView的的范围内适应文本的所有行。

At present, I have something, but all it does is resize the text such that just the first letter/character of the text fills the dimensions of the TextView (i.e. only the first letter is viewable, and it's huge). I need it to fit all the lines of the text within the bounds of the TextView.

下面是我到目前为止有：

Here is what I have so far:

public static void autoScaleTextViewTextToHeight(TextView tv)
{
    final float initSize = tv.getTextSize();
    //get the width of the view's back image (unscaled).... 
    float minViewHeight;
    if(tv.getBackground()!=null)
    {
      minViewHeight = tv.getBackground().getIntrinsicHeight();
    }
    else
    {
      minViewHeight = 10f;//some min.
    }
    final float maxViewHeight = tv.getHeight() - (tv.getPaddingBottom()+tv.getPaddingTop())-12;// -12 just to be sure
    final String s = tv.getText().toString();

    //System.out.println(""+tv.getPaddingTop()+"/"+tv.getPaddingBottom());

    if(minViewHeight >0 && maxViewHeight >2)
    {
      Rect currentBounds = new Rect();
      tv.getPaint().getTextBounds(s, 0, s.length(), currentBounds);
      //System.out.println(""+initSize);
      //System.out.println(""+maxViewHeight);
      //System.out.println(""+(currentBounds.height()));

      float resultingSize = 1;
      while(currentBounds.height() < maxViewHeight)
      {
        resultingSize ++;
        tv.setTextSize(resultingSize);

        tv.getPaint().getTextBounds(s, 0, s.length(), currentBounds);
        //System.out.println(""+(currentBounds.height()+tv.getPaddingBottom()+tv.getPaddingTop()));
        //System.out.println("Resulting: "+resultingSize);
      }
      if(currentBounds.height()>=maxViewHeight)
      {
        //just to be sure, reduce the value
        tv.setTextSize(resultingSize-1);
      }
    }
}

我认为这个问题是在使用 tv.getPaint（）的。getTextBounds（...）。它总是返回少量文本边界......相对于小 tv.getWidth（）和 tv.getHeight（）值......即使文本大小远远小于宽度或高度更大的的TextView 。

I think the problem is in the use of tv.getPaint().getTextBounds(...). It always returns small numbers for the text bounds... small relative to the tv.getWidth() and tv.getHeight() values... even if the text size is far larger than the width or height of the TextView.

推荐答案

我有同样的问题，写这似乎为我工作的一类。基本上，我用一个静态的布局来绘制一个单独的画布上的文字和重新测量，直到我找到一个适合的字体大小。你可以看到下面贴的话题类。我希望它能帮助。

I had the same problem and wrote a class that seems to work for me. Basically, I used a static layout to draw the text in a separate canvas and remeasure until I find a font size that fits. You can see the class posted in the topic below. I hope it helps.

<一个href="http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds/5535672#5535672">Auto规模的TextView文本界内适合

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