------drawArc draw arc
------drawBitmap draws a bitmap------drawCircle draws a circle
------drawLine draws a line
------drawOval draws an ellipse
------drawPath draws a path
--- ---drawPoint draw a point
------drawPoints draw multiple points
------drawRect draw a rectangle
------drawRoundRect draw a rounded rectangle
------drawText draw a string
-- ----drawTextOnPath draw a string along the path
------setARGB/setColor set the color
------setAlpha set the transparency
------setAntiAlias set whether to anti-
alias ------setShader set Filling effect of the brush
------setShadowLayer Set the shadow
------setStyle Set the brush style
------setStrokeWidth Set the width of the hollow border
------setTextSize Set the size of the text when drawing text
View The provided coordinate method
getTop(): what gets is the distance from the top of the View itself to the top of its parent layout
getLeft(): Gets the distance from the left side of the View itself to the left side of its parent layout
getRight(): Gets the distance from the right side of the View itself to the right side of its parent layout
getBottom(): Gets the bottom of the View itself The distance to the bottom of its parent layout
The method provided by MotionEvent
getX(): Get the distance of the click event from the left side of the control, that is, the view coordinate
getY(): Get the distance of the click event from the top of the control, that is, the view coordinate
getRawX: Get the click event of the entire screen The distance on the left, that is, the absolute coordinate
getRawY: Get the distance from the top of the entire screen of the click event, that is, the absolute coordinate