AWS Configuration

We'll be convering following things:

• Connection with AWS via terminal using Amplify
• Add Storage plugin/category
• Fetch complete list in bucket
• Download any object using key

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Official Statement by AWS _docs

Note

For new projects, we recommend using the latest v2 version of AWS Amplify Library for Android to quickly implement common app use cases like Authentication, Storage, Push Notifications and more.

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PreRequisite

• An AWS console
• Create a user in AWS Console and get following.
  • AWS Console Login:
    • AccountId
    • UserName
    • Password
  • S3 Bucket Keys:
    • Access Key
    • Secret Key

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Steps

We'll be using amplify-sdk _docs for AWS setup

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Android Project Setup

1. Create an android-studio project named "MyAmplifyApp"
2. Install Amplify library - Guide

android {
    compileOptions {
        // Support for Java 8 features
        coreLibraryDesugaringEnabled true
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    // Amplify core dependency
    implementation 'com.amplifyframework:core:ANDROID_VERSION'

    // Support for Java 8 features
    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
}

3. Sync project files

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Install Amplify CLI _docs

1. Open cmd in window (as administrator)
2. Type

curl -sL https://aws-amplify.github.io/amplify-cli/install-win -o install.cmd && install.cmd

3. Verify, if amplify has successfully installed, by typing amplify _v

Connection to Cloud

1. In terminal, open you android studio project path as "C:\Users\HP\AndroidStudioProjects\MyAmplifyApp>"
2. Initialize Amplify

amplify init

3. Enter the following when prompted:

? Enter a name for the project
    `MyAmplifyApp`
? Initialize the project with the above configuration?
    `No`
? Enter a name for the environment
    `dev`
? Choose your default editor:
    `Android Studio`
? Choose the type of app that you're building
    `android`
? Where is your Res directory:
    `app/src/main/res`
? Select the authentication method you want to use:
    `IAM user`
? Enter credentials Access and Secret Key (to login) and region for the AWS account.
    `accessKey`
    `secretKey`
    `region` 

4. Declare feature of AWS that we'll be using (e.g. storage s3_bucket)

amplify add storage

S3_bucket configuration

? Please select from one of the below mentioned services:
> Content (Images, audio, video, etc.)
  NoSQL Database
? Please provide a friendly name for your resource that will be used to label this category in the project:
> mystorage
? Please provide bucket name:
> mybucket

Access permissions to bucket

? Restrict access by?
> Auth/Guest Users
  Individual Groups
  Both
  Learn more


? Who should have access:
❯ Auth users only
  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? (y/N)
-> N

Finally push all changes

amplify push

This will download amplifyConfiguration.json and awsconfiguration.json in res/raw folder. Once done, you have successfully establish connection with AWS server.

Android Project Implementation

Add following dependency

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

Add following plugins in appClass

        try {
            val config = AmplifyConfiguration.fromConfigFile(applicationContext, R.raw.amplifyconfiguration)
            Amplify.addPlugin(AWSCognitoAuthPlugin())
            Amplify.addPlugin(AWSS3StoragePlugin())
            Amplify.configure(config, applicationContext)
            Log.i(TAG, "App: Amplify -> Initialized Amplify")
        } catch (error: AmplifyException) {
            Log.e(TAG, "App: Amplify -> Could not initialize Amplify", error)
        }

AWS S3-Bucket is ready, upload files and try to fetch file using this repository code.