If your Android app is successfully installed on your device but fails to run, there could be several reasons behind this issue. Here are some common factors to consider:

Minimum SDK Version: Ensure that the minimum SDK version specified in your app's manifest file (AndroidManifest.xml) is compatible with the Android device you're trying to run the app on. If the device's Android version is lower than the specified minimum SDK version, the app may not run properly or may crash.

Permissions: Review the permissions requested by your app in the manifest file. If the app requires certain permissions to function correctly, but they are not granted on the device, it can result in unexpected behavior or crashes. Make sure that the required permissions are explicitly requested and granted.

Build Configuration: Check the build configuration settings in Android Studio. Make sure you're building the appropriate variant (debug or release) and that the configuration is correct for the target device. Misconfigured build settings can prevent the app from running correctly.

Missing Dependencies: Verify that all the necessary dependencies and libraries are correctly included in your project. If any required dependencies are missing or not properly imported, it can cause runtime errors or crashes. Ensure that you have added the necessary dependencies in your project's build.gradle file.

Device Compatibility: Consider the hardware and software limitations of the device you're using for testing. If the app relies on specific hardware features or requires a certain minimum device specification (such as screen size or resolution) that is not met by the device, it may result in unexpected behavior or failure to run.

Runtime Errors: Check for any runtime errors or exceptions in the Logcat output in Android Studio. It provides valuable information about issues occurring during runtime. Look for error messages, stack traces, or any specific error codes that can help identify the root cause of the problem.

Debugging and Logging: Implement proper logging statements in your code to help identify issues during runtime. Use tools like Logcat or the Android Debug Bridge (ADB) to analyze the log output and identify any potential errors or unexpected behavior. Debugging techniques, such as breakpoints, can also assist in pinpointing the issue.

ProGuard and Code Obfuscation: If you've enabled code obfuscation using ProGuard, ensure that it's configured correctly. Sometimes, ProGuard can obfuscate or remove necessary classes or resources, causing the app to malfunction. Review the ProGuard rules and make any necessary adjustments to prevent essential code from being stripped.