Скачать или смотреть Resolving java.io.FileNotFoundException in Android: Read CSV Files with the Right Permissions

Encountering a `java.io.FileNotFoundException` while trying to read a CSV file in Android? Discover how to properly handle external storage permissions and read files seamlessly on Android 12L and above.
---
This video is based on the question https://stackoverflow.com/q/74085287/ asked by the user 'FGH' ( https://stackoverflow.com/u/5359340/ ) and on the answer https://stackoverflow.com/a/74085702/ provided by the user 'FGH' ( https://stackoverflow.com/u/5359340/ ) 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, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Android compileSdk 32, java.io.FileNotFoundException: /storage/emulated/0/Download/number sample.csv: open failed: EACCES (Permission denied)

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.
---
Resolving java.io.FileNotFoundException in Android: Read CSV Files with the Right Permissions

When developing Android applications, particularly with compileSdk 32, developers often encounter permission-related issues when trying to access files stored in external storage. One common error is the java.io.FileNotFoundException, which typically occurs due to improper handling of file permissions. If you’ve faced an issue like this while attempting to read a CSV file, you’re not alone. In this guide, we will explore the root cause of this problem and provide a thorough solution to read CSV files without encountering permission exceptions.

Understanding the Problem

The error message you may see is as follows:

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

This indicates that your application does not have the necessary permissions to access the specified file. Given the recent changes in Android's permission model, particularly with the introduction of Android 12L, developers must pay close attention to how they handle file access.

Key Points to Consider:

Ensure you correctly request permissions at runtime.

Use android:requestLegacyExternalStorage="true" in your AndroidManifest.xml for compatibility with older storage models.

Handle the URI returned from file selection properly.

Step-by-Step Solution

Now, let’s break down the solution for handling CSV file reading with the correct permissions.

1. Modify Your AndroidManifest.xml

Make sure your manifest includes the required permissions and legacy external storage attribute. Here is an example of how it should look:

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

2. Request Runtime Permissions

When using external storage, you need to request permissions at runtime. Use the ActivityResultLauncher to request READ_EXTERNAL_STORAGE. Here’s how it works:

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

3. Reading the CSV File Correctly

Once you have the URI from the file selection, convert that URI into an InputStream rather than creating a File object. This helps you bypass permission issues. Here’s a revised version of your CSV reading method:

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

4. Handling User Interaction

Set up a listener to trigger permission requests and file selection:

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

Conclusion

Navigating file permissions in Android can be challenging, especially when working with external storage on newer versions like Android 12L. By using InputStream and handling permissions correctly, you can avoid the java.io.FileNotFoundException and successfully read CSV files.

This structured approach ensures that your app not only complies with the latest Android storage policies, but also provides a seamless user experience.

If you have any further questions or run into additional issues, feel free to reach out in the comments!