第一步
打开Android studio，然后点击顶部的File -> setting...
?第二步
进入了Android studio 设置界面，接着Editor -> File and Code Templates->includes ->File Header，在编写注释时注意注解的格式 /**? ? ? */ 或者 //。
?最后 Apply -> OK,大功告成。
注意：注释可以引用一些变量，下面是工具提供的引用变量
${PACKAGE_NAME}
?
name of the package in which the new file is created
${USER}
?
current user system login name
${DATE}
?
current system date
${TIME}
?
current system time
${YEAR}
?
current year
${MONTH}
?
current month
${MONTH_NAME_SHORT}
?
first 3 letters of the current month name. Example: Jan, Feb, etc.
${MONTH_NAME_FULL}
?
full name of the current month. Example: January, February, etc.
${DAY}
?
current day of the month
${DAY_NAME_SHORT}
?
first 3 letters of the current day name. Example: Mon, Tue, etc.
${DAY_NAME_FULL}
?
full name of the current day. Example: Monday, Tuesday, etc.
${HOUR}
?
current hour
${MINUTE}
?
current minute
${PROJECT_NAME}
?
the name of the current project