How to Resume Uploads to Amazon S3 with Java on Android

How to Resume Uploads to Amazon S3 with Java on Android

In the world of cloud computing, there’s no denying the importance and versatility of Amazon’s Simple Storage Service (S3). It’s a highly scalable, reliable, and low-cost service designed for online backup and archiving of data and applications. In this guide, we’ll walk through the process of resuming uploads to Amazon S3 using Java on Android.

What is Amazon S3?

Amazon S3 (Simple Storage Service) is an object storage service that offers industry-leading scalability, data availability, security, and performance. It’s designed to make web-scale computing easier for developers by providing a simple web services interface to store and retrieve any amount of data, at any time, from anywhere on the web.

Why Resume Uploads?

When dealing with large files or unstable network connections, it’s necessary to manage uploads that might be interrupted. Having a mechanism to resume uploads in case of failure is crucial. Resumable uploads minimize the impact of network issues and provide a better user experience.

Setting Up

Firstly, ensure that you have the AWS SDK for Java added as a dependency in your Android project. You can add the SDK using Gradle by adding the following to your build.gradle file:

dependencies {
    implementation 'software.amazon.awssdk:s3:2.15.40'
}

Using the TransferManager

AWS provides a high-level utility for managing transfers called TransferManager. One of the features of TransferManager is the ability to continue uploading a file from where it left off. Here’s how you can use it:

import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.transfer.TransferManager;
import software.amazon.awssdk.services.s3.transfer.Upload;
import software.amazon.awssdk.core.sync.RequestBody;

S3Client s3Client = S3Client.builder().region(region).build();
TransferManager tm = TransferManager.builder()
                    .s3Client(s3Client)
                    .build();

RequestBody requestBody = RequestBody.fromFile(file);

Upload upload = tm.upload(b -> b.bucket(bucket).key(key), requestBody);

This will start the upload. If the upload fails due to a network issue, the TransferManager will automatically try to resume the upload when the network is available again.

Resuming Manually

If you want to control when the upload is resumed, you can call upload.resume() manually. This might be useful if you want to wait for user action before trying to resume the upload.

try {
    upload.completionFuture().join();
} catch (Exception e) {
    // Handle the exception
    if (upload.isPaused()) {
        upload.resume();
    }
}

Conclusion

In conclusion, the Amazon S3 Java SDK provides a robust and straightforward way to handle resumable file uploads from an Android device. This functionality is essential in applications dealing with large file uploads or operating in environments with unstable network connections.

Remember, when working with the AWS SDK, always ensure you handle exceptions and edge cases to prevent data loss or corruption.

Happy coding!

Keywords: Amazon S3, Java, Android, Resume Upload, AWS SDK, TransferManager

Meta Description: Learn how to resume uploads to Amazon S3 using Java on Android, providing a robust solution for applications dealing with large file uploads or unstable network conditions.

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