Why isn't the design of the maps activity appearing in Android Studio?

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There could be several reasons why the design of the maps activity is not appearing in Android Studio. Here are some possible solutions:

1. Check if the Google Maps API key is correctly set up: Make sure that you have generated a valid Google Maps API key and that it is properly configured in your Android Studio project.

2. Make sure the Maps SDK for Android is enabled: Check that the Maps SDK for Android is enabled in the Google Cloud Console. To do this, go to the Cloud Console, select your project, and then navigate to the Maps SDK for Android page to enable it.

3. Check the build and target SDK versions: Make sure that your build and target SDK versions are compatible with the version of the Google Play Services SDK that you are using.

4. Check if the layout file is properly coded: Make sure that your layout file for the maps activity is correctly coded and that it contains the necessary elements to display the maps.

5. Check if the API key is properly set up in the manifest file: Make sure that you have properly set up the API key in the manifest file, so that the app can access the Google Maps API.

6. Check if the necessary dependencies are added in the Gradle files: Make sure that you have added the necessary dependencies for Google Play Services and Google Maps SDK in your Gradle files.

If none of these solutions work, try searching for specific error messages or logging messages related to the issue and check for similar issues that have been reported by other developers.