The source code for Android apps is typically available in the form of open-source projects hosted on platforms like GitHub, GitLab, or Bitbucket. Here are some common steps to find Android app source code:
GitHub: GitHub is a popular platform for hosting and sharing code. You can search for Android projects using the GitHub search bar. For example, if you're interested in a specific app, you can search for its name followed by "GitHub" to find its repository.
GitLab: Similar to GitHub, GitLab is another platform that hosts code repositories. You can search for Android projects on GitLab using their search feature.