??一般情況下画拾，TextView的行數(shù)要等到其布局完成后才能獲取到灼狰，否則如果直接調(diào)用textView.getLineCount()函數(shù)獲取到的結(jié)果只會為0阳距，那能不能提前獲取到TextView的行數(shù)呢，當然是肯定的糖声。TextView內(nèi)部的換行是通過一個StaticLayout的類來處理的豹悬，而且我們調(diào)用的getLineCount()方法最后也是調(diào)用的StaticLayout類中的getLineCount()方法葵陵，所以我們只需要創(chuàng)建一個和TextView內(nèi)部一樣的StaticLayout就可以了，然后調(diào)用staticLayout.getLineCount()方法就可以獲取到和當前TextView行數(shù)一樣的值了瞻佛，但要注意一個前提條件就是保證TextView的width是已知的脱篙，否則也無法獲取到正確的行數(shù)。

/**
 * 提前獲取textview行數(shù)
 */
public class TextViewLinesUtil {
    public static int getTextViewLines(TextView textView, int textViewWidth) {
        int width = textViewWidth - textView.getCompoundPaddingLeft() - textView.getCompoundPaddingRight();
        StaticLayout staticLayout;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            staticLayout = getStaticLayout23(textView, width);
        } else {
            staticLayout = getStaticLayout(textView, width);
        }
        int lines = staticLayout.getLineCount();
        int maxLines = textView.getMaxLines();
        if (maxLines > lines) {
            return lines;
        }
        return maxLines;
    }

    /**
     * sdk>=23
     */
    @RequiresApi(api = Build.VERSION_CODES.M)
    private static StaticLayout getStaticLayout23(TextView textView, int width) {
        StaticLayout.Builder builder = StaticLayout.Builder.obtain(textView.getText(),
                0, textView.getText().length(), textView.getPaint(), width)
                .setAlignment(Layout.Alignment.ALIGN_NORMAL)
                .setTextDirection(TextDirectionHeuristics.FIRSTSTRONG_LTR)
                .setLineSpacing(textView.getLineSpacingExtra(), textView.getLineSpacingMultiplier())
                .setIncludePad(textView.getIncludeFontPadding())
                .setBreakStrategy(textView.getBreakStrategy())
                .setHyphenationFrequency(textView.getHyphenationFrequency())
                .setMaxLines(textView.getMaxLines() == -1 ? Integer.MAX_VALUE : textView.getMaxLines());
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            builder.setJustificationMode(textView.getJustificationMode());
        }
        if (textView.getEllipsize() != null && textView.getKeyListener() == null) {
            builder.setEllipsize(textView.getEllipsize())
                    .setEllipsizedWidth(width);
        }
        return builder.build();
    }

    /**
     * sdk<23
     */
    private static StaticLayout getStaticLayout(TextView textView, int width) {
        return new StaticLayout(textView.getText(),
                0, textView.getText().length(),
                textView.getPaint(), width, Layout.Alignment.ALIGN_NORMAL,
                textView.getLineSpacingMultiplier(),
                textView.getLineSpacingExtra(), textView.getIncludeFontPadding(), textView.getEllipsize(),
                width);
    }
}