Upload & Download Images to AWS S3 in Android Studio — Part II (Download)

This is Part II of integrating AWS S3 into an Android application. In the previous part, we covered uploading images. Now, we’ll focus on downloading files from an AWS S3 bucket. No need to waste time — let’s dive right in!

All AWS S3 dependencies are already configured in previous part I. Now, we just need to:

  • Integrate WorkManager for the download process.
  • Add a “Download” button to start downloading files on click.
  • Show a CircularProgressBar while files are downloading.
  • Display the downloaded images in a RecyclerView for a list view.

We’ll keep it simple.

Let’s start by updating the activity_main.xml layout.

Now that the layout is updated, let’s start working on MainActivity.kt by binding the UI components.

Steps:

  1. Initialize views (Button, CircularProgressBar, RecyclerView).
  2. Set up the onClickListener for the Download button.
  3. Use WorkManager to handle the download process.
  4. Update the RecyclerView with the downloaded images.

I’ll provide the MainActivity.kt code to bind the UI components:

When the Download button is clicked, the download process starts using WorkManager. We create the S3ListWorkerclass, which extends the Worker class and retrieves AWS S3 access keys from local.properties. Once the file download is complete, it returns a Result with the output. We then handle the downloaded files in RecyclerView to display them.

Now, we need to implement the setAdapter function, which will handle the list and display all items in the RecyclerView.

make layout for itemview.

This is the final adapter setup, allowing us to download files from the AWS S3 bucket.

Congratulations! 🎉 You’ve successfully implemented file upload and download on AWS S3.

Up next, I’ll cover AWS S3 upload in Flutter using MethodChannel (Android Native). Since Flutter doesn’t allow direct uploads without Amplify/Cognito, I’ll show you an easy way to achieve this without them.

Stay tuned and keep learning! 🚀

Learn more Upload & Download Images to AWS S3 in Android Studio — Part II (Download)

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