AutoExpandTextView.java 文件源码

/**
 * Re size the font so the specified text fits in the text box assuming the text box is the
 * specified width.
 */
private void refitText() {
    CharSequence text = getText();

    if (TextUtils.isEmpty(text)) {
        return;
    }

    TransformationMethod method = getTransformationMethod();
    if (method != null) {
        text = method.getTransformation(text, this);
    }
    int targetWidth = getWidth() - getPaddingLeft() - getPaddingRight();
    if (targetWidth > 0) {
        float high = 100;
        float low = 0;

        mPaint.set(getPaint());
        mPaint.setTextSize(getTextSize());
        float letterSpacing = getLetterSpacing(text, mPaint, targetWidth, low, high,
                mPrecision);
        mPaint.setLetterSpacing(letterSpacing);
        calculateSections(text);

        super.setLetterSpacing(letterSpacing);
    }
}