Common methods:
Construction method
Paint mPaint = new Paint();
Reset brush
mPaint.reset();
Set color
mPaint.setColor(Color.RED); /setARGB(int a, int r, int g, int b)
Set transparency
mPaint.setAlpha(255);
Set style
mPaint.setStyle(Paint.Style.FILL)
Paint.Style.FILL 填充内容
Paint.Style.STROKE 描边
Paint.Style.FILL_AND_STROKE
Set brush width
mPaint.setStrokeWidth(50)
Set cap
mPaint.setStrokeCap(Paint.Cap.BUTT)
Paint.Cap.BUTT 没有
Paint.Cap.ROUND 圆形
Paint.Cap.SQUARE
Set the line connection style
mPaint.setStrokeJoin(Paint.Join.MITER);
Join.MITER（结合处为锐角）
Join.Round(结合处为圆弧)
Join.BEVEL(结合处为直线)
Anti-aliasing
mPaint.setAntiAlias(true);
Will lose some performance
Set whether to use image dithering
mPaint.setDither(true);
It will make the color of the drawn picture more clear and full. (Also lose performance)
Text drawing:
Get character line spacing
mPaint.getFontSpacing()
Get the spacing between characters
mPaint.getLetterSpacing();
Set the spacing between characters
mPaint.setLetterSpacing(letterSpacing)
Set Strikethrough
mPaint.setStrikeThruText(true);
Whether to set underline
mPaint.setUnderlineText(true);
Set text size
mPaint.setTextSize(textSize)
Get text size
mPaint.getTextSize();
Set font type
mPaint.setTypeface(Typeface.BOLD)
Typeface.BOLD 粗体
Typeface.ITALIC 斜体
Load custom font
Typeface.create(familyName, style)
Set text slant
mPaint.setTextSkewX(-0.25f);
The officially recommended -0.25f is italic
Text alignment
mPaint.setTextAlign(Align.LEFT)
Align.LEFT 左对齐
Align.CENTER 中间对其
Align.RIGHT 右对齐
Calculate a string of specified length
mPaint.breakText(text, measureForwards, maxWidth, measuredWidth)
text:字符串
measureForwards：boolean
maxWidth：int
measuredWidth：float[] 结果接收
Get rectangular area of text (width and height)
mPaint.getTextBounds(text, index, count, bounds)`
`mPaint.getTextBounds(text, start, end, bounds)
Get the rough width of the text
mPaint.measureText(str);
Get the width of each character
`
mPaint.getTextWidths(str, measuredWidth);
mPaint.getTextWidths(text, start, end, widths)`textWidths字符数
