Java Code Examples for android.text.Layout#getSpacingMultiplier()

/**
 * Prior to version 20, If the Layout specifies extra space between lines (either by spacingmult
 * or spacingadd) the StaticLayout would erroneously add this space after the last line as well.
 * This bug was fixed in version 20. This method calculates the extra space and reduces the height
 * by that amount.
 *
 * @param layout The layout.
 * @return The height of the layout.
 */
public static int getHeight(Layout layout) {
  if (layout == null) {
    return 0;
  }

  int extra = 0;
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT_WATCH
      && layout instanceof StaticLayout) {
    int line = Math.max(0, layout.getLineCount() - 1);
    int above = layout.getLineAscent(line);
    int below = layout.getLineDescent(line);
    float originalSize = (below - above - layout.getSpacingAdd()) / layout.getSpacingMultiplier();
    float ex = below - above - originalSize;
    if (ex >= 0) {
      extra = (int) (ex + 0.5);
    } else {
      extra = -(int) (-ex + 0.5);
    }
  }
  return layout.getHeight() - extra;
}
 

private static float getLineBottomWithoutSpacing(@NonNull Layout layout, int line) {
    final float value = layout.getLineBottom(line);

    final boolean isLastLineSpacingNotAdded = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    final boolean isLastLine = line == (layout.getLineCount() - 1);

    final float lineBottomWithoutSpacing;

    final float lineSpacingExtra = layout.getSpacingAdd();
    final float lineSpacingMultiplier = layout.getSpacingMultiplier();

    final boolean hasLineSpacing = Float.compare(lineSpacingExtra, .0F) != 0
            || Float.compare(lineSpacingMultiplier, 1F) != 0;

    if (!hasLineSpacing || isLastLine && isLastLineSpacingNotAdded) {
        lineBottomWithoutSpacing = value;
    } else {
        final float extra;
        if (Float.compare(lineSpacingMultiplier, 1F) != 0) {
            final float lineHeight = getLineHeight(layout, line);
            extra = lineHeight - (lineHeight - lineSpacingExtra) / lineSpacingMultiplier;
        } else {
            extra = lineSpacingExtra;
        }
        lineBottomWithoutSpacing = value - extra;
    }

    return lineBottomWithoutSpacing;
}
 

@Override
protected void onDraw(Canvas canvas) {
	TextPaint paint = getPaint();
	paint.setColor(getCurrentTextColor());
	paint.drawableState = getDrawableState();
	mViewWidth = getMeasuredWidth();
	String text = getText().toString();
	mLineY = 0;
	mLineY += getTextSize();
	Layout layout = getLayout();

	// layout.getLayout()在4.4.3出现NullPointerException
	if (layout == null) {
		return;
	}

	Paint.FontMetrics fm = paint.getFontMetrics();

	int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
	textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout
			.getSpacingAdd());

	for (int i = 0; i < layout.getLineCount(); i++) {
		int lineStart = layout.getLineStart(i);
		int lineEnd = layout.getLineEnd(i);
		float width = StaticLayout.getDesiredWidth(text, lineStart,
				lineEnd, getPaint());
		String line = text.substring(lineStart, lineEnd);
		if (needScale(line)) {
			drawScaledText(canvas, lineStart, line, width);
		} else {
			canvas.drawText(line, 0, mLineY, paint);
		}
		mLineY += textHeight;
	}
}
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    paint.drawableState = getDrawableState();
    mViewWidth = getMeasuredWidth();
    String text = getText().toString();
    mLineY = 0;
    mLineY += getTextSize();
    Layout layout = getLayout();

    // layout.getLayout()在4.4.3出现NullPointerException
    if (layout == null) {
        return;
    }

    Paint.FontMetrics fm = paint.getFontMetrics();

    int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
    textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout
            .getSpacingAdd());
    //解决了最后一行文字间距过大的问题
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        float width = StaticLayout.getDesiredWidth(text, lineStart,
                lineEnd, getPaint());
        String line = text.substring(lineStart, lineEnd);

        if (i < layout.getLineCount() - 1) {
            if (needScale(line)) {
                drawScaledText(canvas, lineStart, line, width);
            } else {
                canvas.drawText(line, 0, mLineY, paint);
            }
        } else {
            canvas.drawText(line, 0, mLineY, paint);
        }
        mLineY += textHeight;
    }
}
 

public static int getLineBottomWithoutPaddingAndSpacing(
        @NonNull Layout layout,
        int line
) {

    final int bottom = layout.getLineBottom(line);
    final boolean lastLineSpacingNotAdded = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    final boolean isSpanLastLine = line == (layout.getLineCount() - 1);

    final int lineBottom;
    final float lineSpacingExtra = layout.getSpacingAdd();
    final float lineSpacingMultiplier = layout.getSpacingMultiplier();

    // simplified check
    final boolean hasLineSpacing = lineSpacingExtra != DEFAULT_EXTRA
            || lineSpacingMultiplier != DEFAULT_MULTIPLIER;

    if (!hasLineSpacing
            || (isSpanLastLine && lastLineSpacingNotAdded)) {
        lineBottom = bottom;
    } else {
        final float extra;
        if (Float.compare(DEFAULT_MULTIPLIER, lineSpacingMultiplier) != 0) {
            final int lineHeight = getLineHeight(layout, line);
            extra = lineHeight -
                    ((lineHeight - lineSpacingExtra) / lineSpacingMultiplier);
        } else {
            extra = lineSpacingExtra;
        }
        lineBottom = (int) (bottom - extra + .5F);
    }

    // check if it is the last line that span is occupying **and** that this line is the last
    //  one in TextView
    if (isSpanLastLine
            && (line == layout.getLineCount() - 1)) {
        return lineBottom - layout.getBottomPadding();
    }

    return lineBottom;
}
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    paint.drawableState = getDrawableState();
    width = getMeasuredWidth();
    String text = getText().toString();

    Paint.FontMetrics fm = paint.getFontMetrics();
    // 计算行高
    Layout layout = getLayout();

    // layout.getLayout()在4.4.3出现NullPointerException
    if (layout == null) {
        return;
    }

    textHeight = fm.descent - fm.ascent;
    textHeight = textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd();

    float firstHeight = getTextSize();

    int gravity = getGravity();
    if ((gravity & 0x1000) == 0) { // 是否垂直居中
        firstHeight = firstHeight + (textHeight - firstHeight) / 2;
    }

    int paddingLeft = getPaddingLeft();
    int paddingRight = getPaddingRight();
    width = width - paddingLeft - paddingRight;

    lines.clear();
    tailLines.clear();

    // 文本含有换行符时，分割单独处理
    String[] items = text.split("\\n");
    for (String item : items) {
        calc(paint, item);
    }

    for (int i = 0; i < lines.size(); i++) {
        float drawY = i * textHeight + firstHeight;
        String line = lines.get(i);
        // 绘画起始x坐标
        float drawSpacingX = paddingLeft;
        float gap = (width - paint.measureText(line));
        float interval = gap / (line.length() - 1);

        // 绘制最后一行
        if (tailLines.contains(i)) {
            interval = 0;
            if (align == Align.ALIGN_CENTER)
                drawSpacingX += gap / 2;
            else if (align == Align.ALIGN_RIGHT)
                drawSpacingX += gap;
        }

        for (int j = 0; j < line.length(); j++) {
            float drawX = paint.measureText(line.substring(0, j))
                    + interval * j;
            canvas.drawText(line.substring(j, j + 1), drawX + drawSpacingX,
                    drawY, paint);
        }
    }
}
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    // 返回绘制状态的资源ID数组表示视图的当前状态
    paint.drawableState = getDrawableState();
    // 对View上的内容进行测量后得到的View内容占据的宽度
    // 前提是你必须在父布局的onLayout()方法或者此View的onDraw()方法里调用measure(0,0);
    // 否则你得到的结果和getWidth()得到的结果一样。
    mViewWidth = getMeasuredWidth();
    // 获取文本
    String text = getText().toString();
    mLineY = 0;
    mLineY += getTextSize();
    // 获取用于显示当前文本的布局
    Layout layout = getLayout();

    if (layout == null) {
        return;
    }

    Paint.FontMetrics fm = paint.getFontMetrics();

    int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
    textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());

    for (int i = 0; i < layout.getLineCount(); i++) {
        // 返回文本中的指定行开头的偏移
        int lineStart = layout.getLineStart(i);
        // 返回文本中的指定行最后一个字符的偏移
        int lineEnd = layout.getLineEnd(i);
        float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());
        String line = text.substring(lineStart, lineEnd);

        if (line.equals("")) {
            break;
        }

        if (i < layout.getLineCount() - 1) {
            if (needScale(line)) {
                drawScaledText(canvas, lineStart, line, width);
            } else {
                canvas.drawText(line, 0, mLineY, paint);
            }
        } else {
            canvas.drawText(line, 0, mLineY, paint);
        }

        // 增加行高
        mLineY += textHeight;
    }
}