实际上解决方案是在谷歌的DialogTitle类…虽然它不如公认的方法有效，但它更简单，也更容易适应。

public class SingleLineTextView extends TextView {

  public SingleLineTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    setSingleLine();
    setEllipsize(TruncateAt.END);
  }

  public SingleLineTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setSingleLine();
    setEllipsize(TruncateAt.END);
  }

  public SingleLineTextView(Context context) {
    super(context);
    setSingleLine();
    setEllipsize(TruncateAt.END);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    final Layout layout = getLayout();
    if (layout != null) {
      final int lineCount = layout.getLineCount();
      if (lineCount > 0) {
        final int ellipsisCount = layout.getEllipsisCount(lineCount - 1);
        if (ellipsisCount > 0) {

          final float textSize = getTextSize();

          // textSize is already expressed in pixels
          setTextSize(TypedValue.COMPLEX_UNIT_PX, (textSize - 1));

          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
      }
    }
  }

}

这里还有另一个解决方案，只是为了好玩。它可能不是很有效，但它确实处理了文本的高度和宽度，以及有标记的文本。

@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec)
{
    if ((MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED)
            && (MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.UNSPECIFIED)) {

        final float desiredWidth = MeasureSpec.getSize(widthMeasureSpec);
        final float desiredHeight = MeasureSpec.getSize(heightMeasureSpec);

        float textSize = getTextSize();
        float lastScale = Float.NEGATIVE_INFINITY;
        while (textSize > MINIMUM_AUTO_TEXT_SIZE_PX) {
            // Measure how big the textview would like to be with the current text size.
            super.onMeasure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);

            // Calculate how much we'd need to scale it to fit the desired size, and
            // apply that scaling to the text size as an estimate of what we need.
            final float widthScale = desiredWidth / getMeasuredWidth();
            final float heightScale = desiredHeight / getMeasuredHeight();
            final float scale = Math.min(widthScale, heightScale);

            // If we don't need to shrink the text, or we don't seem to be converging, we're done.
            if ((scale >= 1f) || (scale <= lastScale)) {
                break;
            }

            // Shrink the text size and keep trying.
            textSize = Math.max((float) Math.floor(scale * textSize), MINIMUM_AUTO_TEXT_SIZE_PX);
            setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
            lastScale = scale;
        }
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

这个解决方案适合我们:

public class CustomFontButtonTextFit extends CustomFontButton
{
    private final float DECREMENT_FACTOR = .1f;

    public CustomFontButtonTextFit(Context context) {
        super(context);
    }

    public CustomFontButtonTextFit(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomFontButtonTextFit(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }

    private synchronized void refitText(String text, int textWidth) {
        if (textWidth > 0) 
        {
            float availableWidth = textWidth - this.getPaddingLeft()
                    - this.getPaddingRight();

            TextPaint tp = getPaint();
            Rect rect = new Rect();
            tp.getTextBounds(text, 0, text.length(), rect);
            float size = rect.width();

            while(size > availableWidth)
            {
                setTextSize( getTextSize() - DECREMENT_FACTOR );
                tp = getPaint();

                tp.getTextBounds(text, 0, text.length(), rect);
                size = rect.width();
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
        int parentHeight = MeasureSpec.getSize(heightMeasureSpec);

        refitText(this.getText().toString(), parentWidth);

        if(parentWidth < getSuggestedMinimumWidth())
            parentWidth = getSuggestedMinimumWidth();

        if(parentHeight < getSuggestedMinimumHeight())
            parentHeight = getSuggestedMinimumHeight();

        this.setMeasuredDimension(parentWidth, parentHeight);
    }

    @Override
    protected void onTextChanged(final CharSequence text, final int start,
            final int before, final int after) 
    {
        super.onTextChanged(text, start, before, after);

        refitText(text.toString(), this.getWidth());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
        super.onSizeChanged(w, h, oldw, oldh);

        if (w != oldw) 
            refitText(this.getText().toString(), w);
    }
}

你可以使用android.text.StaticLayout类。这就是TextView内部使用的。

参考ScalableTextView.java这里自动适合Android的TextView。我已经添加了代码来根据文本长度收缩和扩展TextView

适合边界的文本(1行)

让文本缩小到适合一行的边界:

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:autoSizeTextType="uniform"
    android:lines:"1"
/>