Скачать или смотреть How to Resolve Xamarin Application Restart Issue When Opening New Activities

Discover how to fix the problem of your `Xamarin` application restarting when trying to open a new activity in Xamarin.Forms.
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Solving the Xamarin Application Restart Issue When Opening a New Activity

If you're working on a Xamarin application and encounter the irritating issue where your app restarts or crashes when trying to open a new activity, you're not alone. This common problem can be especially frustrating, as it disrupts the user experience and may leave you scratching your head about what could be causing it. In this guide, we will address the underlying issue and walk you through the solution, ensuring a seamless navigation experience in your app.

The Problem: Application Restarts on New Activity

In your Xamarin application, particularly when using Xamarin.Forms in conjunction with Xamarin.Android, you might be leveraging a native intent to launch a new activity — in your case, EmbeddedNavigationActivity for Mapbox Navigation. Here’s the crux: while this code might work perfectly on the emulator or various devices, it could unexpectedly cause your application to restart on some specific devices, like the Huawei P30 Pro.

Understanding the Code

Here’s a brief look at the code implementation that you're using to open a new activity:

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

This interface is implemented in your Xamarin.Android code as follows:

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

The Odd Behavior on Huawei P30 Pro

Despite running smoothly on other platforms, the application may exhibit erratic behavior on certain devices due to device-specific settings or platform nuances. In your case, the Huawei P30 Pro causes the app to restart when opening the new navigation activity.

The Solution: Fixing the fetchRoute() Error

After investigating the behavior, we found that the root cause lies in an event known as fetchRoute(), which is triggered as the new activity opens:

Parsing Error: The issue stems from how a double is parsed. In the P30 Pro, it attempts to interpret decimal numbers using a culture setting that may lead to incorrect formatting. For instance, it tries to parse 27,33 as a double, while it should correctly parse it as 27.33.

Localized Numerals: This parsing discrepancy occurs because devices can have different culture settings, leading to variance in how numerical values are formatted.

Steps to Fix

To resolve this error and prevent the application from restarting, consider the following solutions:

Culture Settings: Ensure that your application consistently uses a specific culture for parsing numbers. You can enforce culture by setting it in your code:

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

Error Handling: Enhance your error handling to catch and manage potential exceptions during the number parsing phase. Logging these errors might provide insights into what’s going wrong:

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

Testing Across Devices: Always test your application on various physical devices and configurations to ensure consistent performance.

Conclusion

By understanding the root cause of the app restart issue in your Xamarin application and implementing the appropriate solutions, you can prevent interruptions and deliver a smooth user experience. The impact of ensuring correct parsing of numbers based on locale is vital, particularly for diverse user bases across different devices. Always remember to test your app on multiple platforms to ensure comprehensive functionality without unexpected crashes.

If you have further questions or need additional assistance with your Xamarin.Forms project, feel free to reach out in the comments! Happy coding!