Flutter App Now Fails On Android 8.0.0/API Level 27, When Previously Succeeded

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Introduction

Flutter, a popular open-source mobile app development framework, has been gaining momentum in recent years. However, some users have reported issues with running Flutter apps on Android 8.0.0/API level 27. In this article, we will delve into the possible causes of this issue and provide a step-by-step guide to troubleshoot and resolve the problem.

The Issue

For a few days now, even the simplest Flutter app (e.g. the "skeleton"-app created via Android Studio's "Create New Flutter Project") fails to run on an Android 8.0.0/API-level-27 device. This issue has been reported by several users, and it's essential to identify the root cause and find a solution to ensure seamless app development.

Possible Causes

  1. Android SDK Version: The Android SDK version may be outdated, causing compatibility issues with the Flutter framework.
  2. Gradle Version: The Gradle version used in the project may be incompatible with the Android SDK version.
  3. Flutter Version: The Flutter version may be outdated, causing issues with the Android SDK.
  4. Android NDK: The Android NDK version may be outdated, causing issues with the Flutter framework.

Troubleshooting Steps

Step 1: Update Android SDK

  • Open Android Studio and go to Tools > SDK Manager.
  • Click on the SDK Tools tab and check if the Android SDK Platform 27 is installed.
  • If not, click on the Show Package Details button and select the Android SDK Platform 27 package.
  • Click on the Install button to update the Android SDK.

Step 2: Update Gradle

  • Open the project's build.gradle file and check the Gradle version.
  • Update the Gradle version to the latest version (e.g., 4.1.2).
  • Save the changes and sync the project.

Step 3: Update Flutter

  • Open the terminal and run the command flutter upgrade to update the Flutter framework.
  • Run the command flutter doctor to check for any issues.

Step 4: Update Android NDK

  • Open the project's android/gradle.properties file and check the Android NDK version.
  • Update the Android NDK version to the latest version (e.g., 21.4.7075529).
  • Save the changes and sync the project.

Step 5: Clean and Rebuild the Project

  • Open the terminal and run the command flutter clean to clean the project.
  • Run the command flutter build android to rebuild the project.

Conclusion

In conclusion, the issue of Flutter app failing on Android 8.0.0/API level 27 can be resolved by updating the Android SDK, Gradle, Flutter, and Android NDK versions. By following the troubleshooting steps outlined in this article, developers can ensure seamless app development and deployment on Android devices.

Additional Tips

  • Always keep the Android SDK, Gradle, Flutter, and Android NDK versions up-to-date to avoid compatibility issues.
  • Use the latest version of Android Studio to ensure compatibility with the latest Android SDK.
  • Use the flutter doctor command to check for any issues with the Flutter framework.

Common Issues and Solutions

Issue 1: Android SDK not installed

  • Solution: Install the Android SDK Platform 27 using the SDK Manager.

Issue 2: Gradle version not compatible

  • Solution: Update the Gradle version to the latest version (e.g., 4.1.2).

Issue 3: Flutter version not compatible

  • Solution: Update the Flutter version to the latest version using the flutter upgrade command.

Issue 4: Android NDK not installed

  • Solution: Install the Android NDK using the SDK Manager.

Frequently Asked Questions

Q: Why is my Flutter app failing on Android 8.0.0/API level 27?

A: The issue may be caused by outdated Android SDK, Gradle, Flutter, or Android NDK versions.

Q: How can I update the Android SDK?

A: Open Android Studio and go to Tools > SDK Manager to update the Android SDK.

Q: How can I update the Gradle version?

A: Open the project's build.gradle file and update the Gradle version to the latest version (e.g., 4.1.2).

Q: How can I update the Flutter version?

A: Run the command flutter upgrade to update the Flutter framework.

Q: How can I update the Android NDK?

Q: What are the possible causes of a Flutter app failing on Android 8.0.0/API level 27?

A: The possible causes of a Flutter app failing on Android 8.0.0/API level 27 include:

  • Android SDK Version: The Android SDK version may be outdated, causing compatibility issues with the Flutter framework.
  • Gradle Version: The Gradle version used in the project may be incompatible with the Android SDK version.
  • Flutter Version: The Flutter version may be outdated, causing issues with the Android SDK.
  • Android NDK: The Android NDK version may be outdated, causing issues with the Flutter framework.

Q: How can I update the Android SDK to resolve the issue?

A: To update the Android SDK, follow these steps:

  1. Open Android Studio and go to Tools > SDK Manager.
  2. Click on the SDK Tools tab and check if the Android SDK Platform 27 is installed.
  3. If not, click on the Show Package Details button and select the Android SDK Platform 27 package.
  4. Click on the Install button to update the Android SDK.

Q: How can I update the Gradle version to resolve the issue?

A: To update the Gradle version, follow these steps:

  1. Open the project's build.gradle file and check the Gradle version.
  2. Update the Gradle version to the latest version (e.g., 4.1.2).
  3. Save the changes and sync the project.

Q: How can I update the Flutter version to resolve the issue?

A: To update the Flutter version, follow these steps:

  1. Open the terminal and run the command flutter upgrade to update the Flutter framework.
  2. Run the command flutter doctor to check for any issues.

Q: How can I update the Android NDK to resolve the issue?

A: To update the Android NDK, follow these steps:

  1. Open the project's android/gradle.properties file and check the Android NDK version.
  2. Update the Android NDK version to the latest version (e.g., 21.4.7075529).
  3. Save the changes and sync the project.

Q: What are the common issues that can cause a Flutter app to fail on Android 8.0.0/API level 27?

A: The common issues that can cause a Flutter app to fail on Android 8.0.0/API level 27 include:

  • Android SDK not installed: The Android SDK Platform 27 may not be installed, causing compatibility issues with the Flutter framework.
  • Gradle version not compatible: The Gradle version used in the project may be incompatible with the Android SDK version.
  • Flutter version not compatible: The Flutter version may be outdated, causing issues with the Android SDK.
  • Android NDK not installed: The Android NDK may not be installed, causing issues with the Flutter framework.

Q: How can I troubleshoot the issue if my Flutter app fails on Android 8.0.0/API level 27?

A: To troubleshoot the issue, follow these steps:

  1. Check the Android SDK version and update it if necessary.
  2. Check the Gradle version and update it if necessary.
  3. Check the Flutter version and update it if necessary.
  4. Check the Android NDK version and update it if necessary.
  5. Clean and rebuild the project using the flutter clean and flutter build android commands.

Q: What are the additional tips to ensure seamless app development and deployment on Android devices?

A: The additional tips to ensure seamless app development and deployment on Android devices include:

  • Always keep the Android SDK, Gradle, Flutter, and Android NDK versions up-to-date to avoid compatibility issues.
  • Use the latest version of Android Studio to ensure compatibility with the latest Android SDK.
  • Use the flutter doctor command to check for any issues with the Flutter framework.

Q: What are the frequently asked questions related to Flutter app issues on Android 8.0.0/API level 27?

A: The frequently asked questions related to Flutter app issues on Android 8.0.0/API level 27 include:

  • Q: Why is my Flutter app failing on Android 8.0.0/API level 27? A: The issue may be caused by outdated Android SDK, Gradle, Flutter, or Android NDK versions.
  • Q: How can I update the Android SDK? A: Open Android Studio and go to Tools > SDK Manager to update the Android SDK.
  • Q: How can I update the Gradle version? A: Open the project's build.gradle file and update the Gradle version to the latest version (e.g., 4.1.2).
  • Q: How can I update the Flutter version? A: Run the command flutter upgrade to update the Flutter framework.
  • Q: How can I update the Android NDK? A: Open the project's android/gradle.properties file and update the Android NDK version to the latest version (e.g., 21.4.7075529).