Android Asset Packaging Tool 2.0 (AAPT2) release notes

Version 2.0

aapt2 compile ...

• Pseudo-localization: generates pseudolocalized versions of default strings when the --pseudo-localize option is specified.
• Legacy mode: treats some class of errors as warnings in order to be more compatible with AAPT when --legacy is specified.
• Compile directory: treats the input file as a directory when --dir is specified. This will emit a zip of compiled files, one for each file in the directory. The directory must follow the Android resource directory structure (res/values-[qualifiers]/file.ext).

aapt2 link ...

• Automatic attribute versioning: adds version qualifiers to resources that use attributes introduced in a later SDK level. This can be disabled with --no-auto-version.
• Min SDK resource filtering: removes resources that can't possibly be selected at runtime due to the application's minimum supported SDK level.