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How to Fix the App Not Installed Error When Manually Installing Flutter APKs

Struggling with the `App Not Installed` issue while installing your Flutter APK on Android devices? Discover the key reasons behind this error and learn how to resolve it effectively in this guide. --- This video is based on the question https://stackoverflow.com/q/77487584/ asked by the user 'riki' ( https://stackoverflow.com/u/10278268/ ) and on the answer https://stackoverflow.com/a/77528137/ provided by the user 'MãĴď' ( https://stackoverflow.com/u/17677301/ ) 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, comments, revision history etc. For example, the original title of the Question was: Flutter apk not install on device 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. --- How to Fix the App Not Installed Error When Manually Installing Flutter APKs If you've encountered a frustrating situation trying to manually install a Flutter APK on your Android device—only to face an App not installed message—you're not alone. This is a common issue faced by many developers, especially when transitioning from developing in Android Studio to manually deploying APKs. In this guide, we'll identify the underlying problem and provide a straightforward solution to ensure your APK installs smoothly. Understanding the Problem When you attempt to install your Flutter APK directly on an Android device and receive the App not installed notification, it typically means there's an issue with compatibility. In many cases, this stems from the Android versioning in your APK settings not matching the capabilities of the device you're using for installation. Common Scenarios Leading to the Error Mismatch between target SDK and device SDK: If the maximum or target SDK versions set in your Flutter application are higher than what your device supports, it can lead to installation failures. APK Versioning Issues: The APK file designed for a certain version of Android may not be backward compatible with older devices. Corrupted APK File: Although less common, an improperly built APK or a corrupted installation file can also lead to issues. Solution Steps: How to Resolve the Installation Error To ensure your APK installs correctly on your Android device, follow these steps: 1. Check Your SDK Versions The first step in resolving this issue is to verify the target and min SDK versions defined in your Flutter app. You can do this by examining your build.gradle file located in your project under the android/app directory. Key Points to Check: Target SDK: This should ideally match or be lower than the version of the device you’re targeting. Minimum SDK: Ensure this isn't set higher than the Android version of your device. For example: [[See Video to Reveal this Text or Code Snippet]] 2. Increase the Max and Target SDK Versions If your device's Android version exceeds your target or you find compatibility warnings, simply increase the maximum and target SDK versions in the build.gradle file to match the Android version you want to support: Change targetSdkVersion to the desired version (e.g., 32 or higher). Ensure compileSdkVersion is at least the same as your targetSdkVersion. Example Adjustment: [[See Video to Reveal this Text or Code Snippet]] 3. Rebuild Your APK After making these adjustments, rebuild your APK using the command: [[See Video to Reveal this Text or Code Snippet]] This will generate a new APK with updated configurations that are more likely to be compatible with a range of devices. 4. Install the APK Again With the newly generated APK, attempt to install it manually on your device again. This time, you should see that it installs without the error message. Conclusion By following these steps, you can resolve the App not installed issue when manually installing Flutter APKs on Android devices. Remember to always check your SDK configurations and build the APK fresh after making changes. Happy coding, and may your Flutter apps install smoothly!