I am attempting to build the android-autofittextview project from the command line using gradle. However, it fails every time with the following error:
/Users/me/android-autofittextview/library/src/main/java/me/grantland/widget/AutofitHelper.java:384: error: unknown tag: attr
* @attr ref android.R.styleable#TextView_textSize
This error is repeated a dozen times in various files.
This happens during the :library:androidJavadocs
I tried turning it off using this approach, but then I get an 'unknown tasks' exception when I attempt to us this as a library project later on.
How can I get javadocs to build correctly with Gradle when the @attr flag is being used?
A javadoc tool has an argument to specify custom tags. That parameter is -tag.
To pass that argument from gradle build file to javadoc tool add a configuration to your build.gradle as follows:
javadoc {
options.tags = [ "attr" ]
}
Custom tags can be specified as single argument with
<name>:<placement>:<head>:
javadoc {
options.tags = [ "attr:a:head" ]
}
来源：https://stackoverflow.com/questions/33246400/gradle-build-javadoc-task-fails-with-unknown-tag-attr