Resolving App Crashes After Clicking the Login Button in Android Studio

Discover why your Android app crashes upon clicking the login button and learn how to debug and solve the issue effectively.
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This video is based on the question https://stackoverflow.com/q/76489725/ asked by the user 'Soham Bhole' ( https://stackoverflow.com/u/17998277/ ) and on the answer https://stackoverflow.com/a/76490014/ provided by the user 'Annas Surdyanto' ( https://stackoverflow.com/u/12445365/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Have you found yourself frustrated while developing an Android app, only to have it crash after clicking the login button? You're not alone! This is a common issue many developers encounter, often leading to confusion and wasted time. In this guide, we'll delve into the possible reasons for an app crash and provide a detailed solution to fix the problem.

Understanding the Problem

In the provided case, the app crashes immediately after a user tries to log in. The developer wrote some code for the first activity and attempted to switch to a second activity upon a successful login. However, despite the expected behavior, the app terminates unexpectedly. To help resolve this issue, we’ll look at some likely causes and how to address them.

Potential Causes of the Crash

There are various reasons why an Android activity might crash during runtime. Here are some common culprits:

Activity Not Registered in the Manifest

Each activity in your app must be declared in the AndroidManifest.xml file. If the intended activity is not listed, the app will throw an error.

Missing android:exported Attribute (for Android 12 and above)

Starting from Android 12, activities need an android:exported attribute if they are accessible from other apps. Failing to include this can lead to crashes when you attempt to launch an activity from your app.

Hilt Dependency Injection Issues

If you're using Hilt for dependency injection, ensure that your activity is annotated with @AndroidEntryPoint. This is often overlooked but vital for proper functioning.

Inappropriate Theme for AppCompatActivity

If you are extending from AppCompatActivity, make sure you're applying an AppCompat theme. Mismatches in theming can lead to crashes upon launching certain components.

Steps to Diagnose and Fix the Crash

To effectively solve the problem, follow these steps:

1. Check Your AndroidManifest.xml

Verify if the MainActivit2y is registered properly in your manifest file. It should look something like this:

[[See Video to Reveal this Text or Code Snippet]]

2. Add the android:exported Attribute

If you're targeting Android 12 or higher, add the android:exported attribute to ensure your activity can be accessed.

3. Review Hilt Annotations

If using Hilt, double-check that your activity has the @AndroidEntryPoint annotation:

[[See Video to Reveal this Text or Code Snippet]]

4. Confirm Proper Theme Application

Make sure you are using a compatible theme in your styles.xml that extends from an AppCompat theme. For example:

[[See Video to Reveal this Text or Code Snippet]]

5. Review Crash Logs

Finally, it's essential to review any error messages or logs generated during the crash. This information can provide precise insight into what's going wrong.

Conclusion

Troubleshooting crashes in an Android app can be a challenge, but understanding the common issues at play can make the process smoother. By ensuring your activities are registered correctly, adhering to new Android requirements, and following best practices, you can effectively address crashes like the one encountered when clicking the login button.

Happy coding! We hope this guide helps you elegantly tackle any similar issues in your Android development journey!

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