github android studio nothing to cmmit no changes detected

I am documenting/sharing here what worked for me. None of the answers here solve my problem.

To update which commit records should be checked out for the submodule, you need to git commit the submodule in addition to committing the changes in the submodule: git add src/repo No changes added to commit (use 'git add' and/or 'git commit -a') (commit or discard the untracked or modified content in submodules) ' to discard changes in working directory) git status also claims submodule has untracked/modified content. Otherwise it shows -dirty hash change which you cannot stage or commit in the top-level repository. If you've already made some commits in your submodule (thus 'clean' in submodule), it reports submodule's hash change. Run git diff in the top-level repository to show what has actually changed Git thinks.

If you change something in submodule dir, Git will detect it and urge you to commit those changes in the top-level repoisitory. It's because Git records which commit (not a branch or a tag, exactly one commit represented in SHA-1 hash) should be checked out for each submodule.

Github android studio nothing to cmmit no changes detected