Скачать или смотреть Resolving Network Errors in React Native Signed APKs: Common Pitfalls and Solutions

Learn how to fix network errors encountered when running signed APKs of your React Native application by updating your AndroidManifest.xml and checking CORS settings.
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This video is based on the question https://stackoverflow.com/q/77758350/ asked by the user 'Ali Asad Jafry' ( https://stackoverflow.com/u/22173544/ ) and on the answer https://stackoverflow.com/a/77758450/ provided by the user 'Milan Jadav' ( https://stackoverflow.com/u/15570574/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Network Errors in React Native Signed APKs: Common Pitfalls and Solutions

If you are a developer working with React Native, you might have encountered a frustrating issue where your application works perfectly when run using the Metro Bundler but throws a network error upon generating a signed APK. This common problem can be perplexing, particularly when the error does not occur in development mode. In this guide, we will delve into why this issue arises and how you can effectively resolve it.

Understanding the Problem

When developing mobile applications, especially those built with frameworks like React Native, you may rely heavily on network requests to authenticate users or fetch data. However, many developers report that after generating a signed APK, their application faces network-related issues that prevent completion of necessary tasks (like logging in or fetching data).

As one developer pointed out, the Axios library typically throws a network error when there is a genuine loss of connection. But in this situation, the error consistently arises regardless of network health or server availability.

Common Causes of Network Errors

Internet Permission in AndroidManifest.xml:

One frequent oversight is the lack of internet permissions in the manifest file, which is required for any application that accesses the web.

Cleartext Traffic Handling:

With newer Android versions emphasizing security, applications may reject non-HTTPS requests that are deemed insecure. Hence, ensuring that your application can handle these requests is crucial.

CORS Issues:

The backend server you are communicating with may enforce CORS (Cross-Origin Resource Sharing) policies. This can create issues for retail builds if the server does not allow requests from your APK's domain.

Solutions to Fix Network Errors

To tackle the Network Errors you are encountering, follow these outlined solutions:

Step 1: Update Your AndroidManifest.xml

First and foremost, ensure that your AndroidManifest.xml file has the necessary permissions and configurations:

Open your AndroidManifest.xml file located in the android/app/src/main/ directory of your React Native project.

Ensure that you have included the following permissions and configurations:

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

Explanation:

The INTERNET permission allows the app to establish network connections.

Setting android:usesCleartextTraffic="true" permits your application to handle cleartext (HTTP) network traffic, which is increasingly restricted in modern Android systems.

Step 2: Check for CORS Issues

If your application communicates with a server, it is crucial to check the server's CORS policies.

Ensure that your server allows requests from the domain where your app is hosted. You may need to adjust the server configurations to permit requests coming from your app in production mode.

Conclusion

Encountering a Network Error when using a signed APK can disorient, but addressing permission issues within your AndroidManifest.xml and resolving CORS policy-related obstacles can lead to the successful operation of your React Native application. By following the steps outlined above, you should be able to fix the issue and ensure a seamless user experience in your production app.

If you continue to face problems, consider revisiting your network code and server configurations for any additional oversights. Happy coding!