What is Amazon S3?

Amazon Simple Storage Service => storage for the Internet, you can use it to store and retrieve data on the web.

Sections to do ….

num	Information	Relevant sections
1.	General product overview and pricing	Amazon S3
2.	How do I work with buckets?	Buckets overview
3.	How do I work with access points?	Managing data access with Amazon S3 access points
4.	How do I work with objects?	Amazon S3 objects overview
5.	How do I make requests?	Making requests
6.	How do I manage access to my resources?	Identity and access management in Amazon S3

Why to use Amazon S3?

By using Amazon S3 we can easily create buckets, storing data and download data with permissions.

How to start using Amazon S3?

Step 1:

Abb this command to commandLine: amplify add storage; Then Enter the following:

? Please select from one of the below mentioned services:
    `Content (Images, audio, video, etc.)`
? You need to add auth (Amazon Cognito) to your project in order to add storage for user files. Do you want to add auth now?
    `Yes`
? Do you want to use the default authentication and security configuration?
    `Default configuration`
? How do you want users to be able to sign in?
    `Username`
? Do you want to configure advanced settings?
    `No, I am done.`
? Please provide a friendly name for your resource that will be used to label this category in the project:
    `S3friendlyName`
? Please provide bucket name:
    `storagebucketname`
? Who should have access:
    `Auth and guest users`
? What kind of access do you want for Authenticated users?
    `create/update, read, delete`
? What kind of access do you want for Guest users?
    `create/update, read, delete`
? Do you want to add a Lambda Trigger for your S3 Bucket?
    `No`

Step 2:

Push the changes to amplify: amplify push

Step 3:

Add the dependencies:

dependencies {
    implementation 'com.amplifyframework:aws-storage-s3:1.17.4'
    implementation 'com.amplifyframework:aws-auth-cognito:1.17.4'
}

Step 4:

Initialize Amplify Storage

Amplify.addPlugin(new AWSCognitoAuthPlugin());
Amplify.addPlugin(new AWSS3StoragePlugin());

Then the class should look like this:

public class MyAmplifyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        try {
            // Add these lines to add the AWSCognitoAuthPlugin and AWSS3StoragePlugin plugins
            Amplify.addPlugin(new AWSCognitoAuthPlugin());
            Amplify.addPlugin(new AWSS3StoragePlugin());
            Amplify.configure(getApplicationContext());

            Log.i("MyAmplifyApp", "Initialized Amplify");
        } catch (AmplifyException error) {
            Log.e("MyAmplifyApp", "Could not initialize Amplify", error);
        }
    }
}

Step 5:

Upload data to your bucket

private void uploadFile() {
    File exampleFile = new File(getApplicationContext().getFilesDir(), "ExampleKey");

    try {
        BufferedWriter writer = new BufferedWriter(new FileWriter(exampleFile));
        writer.append("Example file contents");
        writer.close();
    } catch (Exception exception) {
        Log.e("MyAmplifyApp", "Upload failed", exception);
    }

    Amplify.Storage.uploadFile(
            "ExampleKey",
            exampleFile,
            result -> Log.i("MyAmplifyApp", "Successfully uploaded: " + result.getKey()),
            storageFailure -> Log.e("MyAmplifyApp", "Upload failed", storageFailure)
    );
}