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width:

Paint p = new Paint();
String s = "abc";
float width = p.measureText(s);

height:

Paint p = new Paint();
String s = "abc";
Paint.FontMetrics fm = p.getFontMetrics();
float height = fm.descent - fm.ascent;

垂直居中:

getMeasuredHeight() / 2 + (p.descent- p.ascent)/2 - p.descent