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Resolving the adb: failed to install Error in Flutter Apps on Android Devices

Discover a step-by-step guide to fix the `adb: failed to install` error when deploying Flutter applications on real Android devices. Learn how to adjust your Android manifest and avoid installation issues! --- This video is based on the question https://stackoverflow.com/q/70977989/ asked by the user 'Michael m.' ( https://stackoverflow.com/u/18022352/ ) and on the answer https://stackoverflow.com/a/70978231/ provided by the user 'prashantwosti' ( https://stackoverflow.com/u/1658191/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: adb: failed to install Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Fixing the adb: failed to install Error in Flutter on Android Devices If you’re a Flutter developer attempting to run your application on a real Android device, you may encounter the frustrating error message: adb: failed to install. This issue often arises due to problems related to APK signatures. It can leave you wondering how to proceed with deploying your app. In this guide, we'll guide you through understanding the issue and provide a clear solution to get you back on track. Understanding the Problem When you attempt to install your Flutter application, the Android Debug Bridge (ADB) might generate the following error: [[See Video to Reveal this Text or Code Snippet]] This error implies that the APK you are trying to install is not signed correctly. Android requires that all applications must be signed before installation, and any failure in this process leads to the installation being aborted. Common Attempts and Their Limitations You might have tried several common solutions that did not resolve your issue, such as: Updating Android Studio Running flutter upgrade Executing flutter pub get While these steps are essential for maintaining a healthy development environment, they may not directly address the APK signing issue that’s causing the installation to fail. Solution: Update Your Android Manifest The effective fix for this error is to modify the Android manifest file to explicitly declare that your activity is exported. Here's how to do it: Locate Your Android Manifest File: This file is usually found in the android/app/src/main/AndroidManifest.xml directory of your Flutter project. Edit the Activity Tag: You need to find your main activity declaration and add the android:exported="true" attribute. The modified activity tag should look something like this: [[See Video to Reveal this Text or Code Snippet]] Rebuild Your Application: After saving the changes to the manifest file, rebuild your application using the command: [[See Video to Reveal this Text or Code Snippet]] Deploy Again: After the build completes successfully, attempt to install the application on your Android device again. Conclusion Resolving the adb: failed to install error can be as simple as adjusting a few lines in your Android manifest. By adding the android:exported="true" attribute to your activity declaration, you align with Android's signing requirements, thus preventing installation errors. If you continue to face difficulties, double-check your project's configuration and ensure that all necessary files are properly set up. Happy coding!