一、设置行间距

android:lineSpacingExtra

设置行间距，尺寸值是一个浮点数，后跟一个单位，例如“ 14.5sp”
Extra spacing between lines of text. Must be a dimension value, which is a floating point number appended with a unit such as “14.5sp”.Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).
android:lineSpacingMultiplier

设置行间距乘数。必须为浮点值，例如“ 1.2”
Extra spacing between lines of text, as a multiplier.Must be a floating point value, such as “1.2”.

二、设置字间距

android：letterSpacing
设置字母间距乘数。必须为浮点值，例如“ 1.2”
Text letter-spacing.Must be a floating point value, such as “1.2”.