AWS Lambda env. var. change.

Question

I have an AWS Lambda function with an environment variable. Im trying to update this variable from Android Studio. My primary coding language is Kotlin. I believe i might be able to use Java to as it says Kotlin+Java. Please help as ive been trying for weeks...

Piyush_M · Accepted Answer

Add below dependencies as well while trying the above solution.

dependencies {
    implementation 'com.amazonaws:aws-android-sdk-core:2.53.0'
    implementation 'com.amazonaws:aws-android-sdk-lambda:2.53.0'
}

Additionally, below is the example on how you can integrate the above function in the MainActivity :

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.updateButton).setOnClickListener {
            Thread {
                updateLambdaEnvironmentVariable("MyFunction", "MY_VAR", "new_value")
            }.start()
        }
    }
}

re:Post Agent · Answer

To update an environment variable for an AWS Lambda function using Android Studio with Kotlin or Java, you can use the AWS SDK for Java. Here's a general approach you can follow:

1. First, ensure you have the AWS SDK for Java dependencies in your project. You'll need the Lambda client library.

2. Create a LambdaClient instance to interact with AWS Lambda services.

3. Use the UpdateFunctionConfigurationRequest to specify the changes you want to make to your Lambda function's configuration, including environment variables.

4. Call the updateFunctionConfiguration method on the LambdaClient with your request.

Here's a Kotlin example of how you might structure this:

```kotlin
import software.amazon.awssdk.services.lambda.LambdaClient
import software.amazon.awssdk.services.lambda.model.UpdateFunctionConfigurationRequest
import software.amazon.awssdk.services.lambda.model.Environment

fun updateLambdaEnvironmentVariable(functionName: String, key: String, value: String) {
    val lambdaClient = LambdaClient.create()
    
    val request = UpdateFunctionConfigurationRequest.builder()
        .functionName(functionName)
        .environment(Environment.builder()
            .variables(mapOf(key to value))
            .build())
        .build()
    
    try {
        lambdaClient.updateFunctionConfiguration(request)
        println("Successfully updated environment variable")
    } catch (e: Exception) {
        println("Error updating environment variable: ${e.message}")
    }
}
```

You would call this function with the name of your Lambda function and the key-value pair for the environment variable you want to update.

Remember that updating the configuration creates a new version of your Lambda function. The changes will apply to the $LATEST version of your function, but not to any previously published versions or aliases.

Also, ensure that your AWS credentials are properly set up in your development environment to allow your application to make these API calls to AWS services.

If you're having trouble with specific error messages or configurations, please provide more details about the exact issues you're encountering.  
**Sources**  
[Working with Lambda environment variables - AWS Lambda](https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html)  
[Use UpdateFunctionConfiguration with an AWS SDK or CLI - AWS Lambda](https://docs.aws.amazon.com/lambda/latest/dg/example_lambda_UpdateFunctionConfiguration_section.html)  
[Use UpdateFunctionConfiguration with an AWS SDK or CLI - AWS SDK Code Examples](https://docs.aws.amazon.com/code-library/latest/ug/lambda_example_lambda_UpdateFunctionConfiguration_section.html)

AWS Lambda env. var. change.

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