Android SDK is missing, out of date, or is missing templates. Please ensure you are using SDK version 22 or later

same problem happened to me, From this

I have faced the same issue, to solve it:

1- delete (or move) the projects folder (AndroidStudioProjects).

2- Run the Android-Studio (a WELCOME screen will started).

3- From Welcome Screen choose, "Configure -> Project Defaults -> Project Structure)

4- Under Platform Settings choose SDKs.

5- Select Android SDK -> right_click delete.

6- Right_click -> New Sdk -> Android SDK -> choose your SDK dir -> then OK.

7- Choose the Build target -> apply -> OK. enjoy

I had same issue in Android Studio 3. (the project was open) so I closed the current project and the IDE automatically prompted to download the latest components. once its done everything was working correctly.

Here's a better approach where you don't have to delete/move anything for Android Studio 3.+.

1. Open Android Studio and click cancel/ignore for error prompts on missing SDK for each project.
2. Close all your open projects. You can do this by File > Close Project.
3. After you do step 1 for all projects, the Welcome screen appears.
4. The welcome screen will detect you are missing the SDK and give you options to fix the problem, i.e., install the SDKs for you.