TextView-line spacing and letter spacing

One, set the line spacing

• android:lineSpacingExtra

  Set the line spacing, the size value is a floating point number followed by a unit, such as "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

  Set the line spacing multiplier. Must
  be a floating point value, such as “1.2” Extra spacing between lines of text, as a multiplier.Must be a floating point value, such as “1.2”.

Second, set the word spacing

• android：letterSpacing

  Set the letter spacing multiplier. Must be a floating point value, for example, "1.2 "
  the Text Letter spacing.Must BE-A Floating Point value, SUCH AS "1.2."