获取文本宽度
方法一：先绘制文本所在的矩形区域，再获取矩形区域的宽度
Rect rect = new Rect(); mPaint.getTextBounds(text,0,text.length(), rect); canvas.drawRect(rect, mPaint); float textWidth1 = rect.width(); Log.d("111","textWidth:"+textWidth1);上述方法由于矩形边框紧贴文字，所有没有多余的空间。
方法二：通过Paint的measureText方法直接测量文本宽度
float textWidth2 = mPaint.measureText(text); Log.d("111", "textWidth:"+textWidth2); canvas.drawLine(0, rect.bottom + 20, textWidth2, rect.bottom + 20, mPaint);此方法计算出的宽度会加上开始和结尾的空间，这个空间就是文字和文字之间的空间，为了美观而存在。如果加上下划线会比较直观。
方法三：计算出每个文字的宽度，最后计算总和
float[] textWidths =new float[text.length()]; mPaint.getTextWidths(text, textWidths); float textWidth1 =0; for(int i=0;i此方式计算出的宽度与方法二一样。
TextPaint textPaint =new TextPaint(); textPaint.setTextSize(280); textPaint.setColor(Color.BLUE); textPaint.setStrokeWidth(8); textPaint.setAntiAlias(true); textPaint.setStyle(Paint.Style.FILL); float textWidth1 = Layout.getDesiredWidth(text,textPaint); Log.d("111","textWidth:"+textWidth1);方法计算出的宽度与前两者一致。
获取文本高度
在控件上绘制文字时，经常要考虑到文本的中心位置，这就需要计算并获取整个文本的宽度和高度。
看图了解一下字体基准线
上面所有的属性都被封装在FontMetrics类中,通过它可以获取并计算文本的宽高
top:在一个大小确定的字体中，被当做最高字形，基线(base)上方的最大距离。
ascent:单行文本中，在基线(base)上方被推荐的距离。
descent:单行文本中，在基线(base)下方被推荐的距离。
bottom:在一个大小确定的字体中，被当做最低字形,基线(base)下方的最大距离。
如果我们想要计算这个文字的高度，只需要使用(descent-ascent)
通过上面的图片对基准线有了大致的了解，具体的代码是
private void init(){ mPaint = new Paint(); mPaint.setColor(Color.BLUE); mPaint.setAntiAlias(true); mPaint.setStrokeWidth(8); mPaint.setTextSize(280); mPaint.setStyle(Paint.Style.FILL);}@Overrideprotected void onDraw(Canvas canvas){ super.onDraw(canvas); canvas.translate(200,400); mPaint.setColor(Color.parseColor("#65A21F")); canvas.drawLine(-200,0, canvas.getWidth()-200,0, mPaint); canvas.drawLine(0,-400,0, canvas.getHeight()-400, mPaint); mPaint.setColor(Color.BLACK); mPaint.setStrokeWidth(2); mPaint.setStyle(Paint.Style.STROKE); Rect rect = new Rect(); mPaint.getTextBounds(text,0,text.length(), rect); canvas.drawRect(rect, mPaint); float textHeight1 = rect.height(); Log.d("111","textHeight:"+textHeight1); float textWidth = mPaint.measureText(text);//获取文本的宽度 Paint.FontMetrics fontMetrics = mPaint.getFontMetrics(); mPaint.setStyle(Paint.Style.FILL); mPaint.setStrokeWidth(2); mPaint.setColor(Color.RED); canvas.drawLine(0, fontMetrics.ascent, mPaint.measureText(text), fontMetrics.ascent, mPaint); mPaint.setTextSize(50); canvas.drawText("ascent", textWidth, fontMetrics.ascent, mPaint); mPaint.setColor(Color.parseColor("#6EAD24")); canvas.drawLine(0, fontMetrics.bottom, textWidth, fontMetrics.bottom, mPaint); mPaint.setTextSize(50); canvas.drawText("bottom", textWidth, fontMetrics.bottom +30, mPaint); mPaint.setColor(Color.parseColor("#13AA9C")); canvas.drawLine(0, fontMetrics.descent, textWidth, fontMetrics.descent, mPaint); mPaint.setTextSize(50); canvas.drawText("descent", textWidth, fontMetrics.descent, mPaint); mPaint.setColor(Color.parseColor("#9C17B3")); canvas.drawLine(0,0, textWidth,0, mPaint); mPaint.setTextSize(50); canvas.drawText("baseline", textWidth, fontMetrics.leading, mPaint); mPaint.setColor(Color.parseColor("#DF3A72")); canvas.drawLine(0, fontMetrics.top, textWidth, fontMetrics.top, mPaint); mPaint.setTextSize(50); canvas.drawText("top", textWidth, fontMetrics.top, mPaint); mPaint.setTextSize(280); mPaint.setColor(Color.BLUE); mPaint.setStrokeWidth(8); mPaint.setStyle(Paint.Style.FILL); canvas.drawText(text,0,0, mPaint);}方法一：先绘制文本所在的矩形区域，再获取矩形区域的高度
Rect rect = new Rect(); mPaint.getTextBounds(text,0,text.length(), rect); canvas.drawRect(rect, mPaint); float textHeight1 = rect.height(); Log.d("111","textHeight:"+textHeight1);方法二： 通过getFontMetrics()或getFontMetricsInt()获取测量数据
想要计算高度只需要 descent-ascent
Paint.FontMetrics fontMetrics = mPaint.getFontMetrics(); float height1 = fontMetrics.descent - fontMetrics.ascent; Log.d("111", "文本的推荐高度："+height1); float height2 = fontMetrics.bottom - fontMetrics.top; Log.d("111", "文本的最大高度："+height2);方法三：通过getFontSpacing实现
float height3 = mPaint.getFontSpacing(); Log.d("aaa", "文本的高度："+height3); 来源地址：https://blog.csdn.net/a307326984/article/details/129620543
