If Android Studio is not showing the layout preview after updating to version 3.0.1 or a newer version, there could be several reasons for this issue. Here are some troubleshooting steps to help you resolve the problem:

  1. Sync Gradle: After updating Android Studio, it's a good practice to sync your project with the updated Gradle version. Click on the "Sync Project with Gradle Files" button in the toolbar to ensure that your project is up-to-date.

  2. Update Android Gradle Plugin: Check if you are using the latest version of the Android Gradle Plugin. Update the build.gradle file of your project and set the Android Gradle Plugin version to the latest available version.

    Example:

    gradle
    buildscript { ... dependencies { classpath 'com.android.tools.build:gradle:4.2.2' } }
  3. Clean and Rebuild: Try performing a clean build of your project. Go to "Build" > "Clean Project" and then "Build" > "Rebuild Project". This can help resolve issues related to cached files.

  4. Invalidate Caches and Restart: Sometimes, Android Studio's cache can cause unexpected issues. Go to "File" > "Invalidate Caches / Restart" and select "Invalidate and Restart" to clear the cache and restart the IDE.

  5. Check XML Errors: Verify that there are no XML errors in your layout files. Sometimes, XML errors can prevent the layout preview from rendering. Look for red underlines in your layout files and fix any syntax errors.

  6. Switch Render Engine: In the layout editor, try switching the render engine from "Auto" to "Legacy" or vice versa. Click on the "Toggle Rendering Engine" button in the layout preview toolbar to switch between the rendering engines.

  7. Check Layout Preview Settings: Ensure that you have selected the correct device and orientation in the layout preview. Also, verify that the layout rendering API level is appropriate for your project.

  8. Update SDK and Build Tools: Make sure you have the latest SDK and Build Tools installed. Go to "SDK Manager" and check for updates.

  9. Check for Known Issues: Check the release notes and known issues for the specific version of Android Studio you are using. It's possible that there might be a known issue related to layout rendering.

  10. Revert to Previous Version: If the issue persists and you suspect that it is caused by the update, you can consider reverting back to the previous version of Android Studio that was working fine for you.

If none of the above steps resolve the issue, you may need to investigate further or seek help from the official Android Studio support channels or developer community forums.

Have questions or queries?
Get in Touch