(Android™) Call an AWS Lambda Function

Demonstrates how to call an AWS Lambda function.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest = new CkRest();

    // Connect to the Amazon AWS REST server.
    // such as https://email.us-west-2.amazonaws.com/
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;

    // -------------------------------------------------------------------------------------------
    // Note: The source of the lambda function (hosted on AWS) is shown at the bottom of this page.
    // --------------------------------------------------------------------------------------------

    // If your lambda function URL is: https://itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws/
    // then use just the domain part here:
    success = rest.Connect("itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws",port,bTls,bAutoReconnect);

    // Provide AWS credentials for the REST call.
    CkAuthAws authAws = new CkAuthAws();
    authAws.put_AccessKey("AWS_ACCESS_KEY");
    authAws.put_SecretKey("AWS_SECRET_KEY");
    // the region should match our domain above..
    authAws.put_Region("us-west-2");
    authAws.put_ServiceName("lambda");

    rest.SetAuthAws(authAws);

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("name","Benny");

    rest.AddHeader("Content-Type","application/json");

    CkStringBuilder sbRequestBody = new CkStringBuilder();
    json.EmitSb(sbRequestBody);

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody);
    if (success == false) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

    int statusCode = rest.get_ResponseStatusCode();
    if (statusCode >= 400) {
        Log.i(TAG, "Response Status Code: " + String.valueOf(statusCode));
        Log.i(TAG, "Response Body: " + sbResponseBody.getAsString());
        Log.i(TAG, "Failed.");
        return;
        }

    Log.i(TAG, "Response Body:");
    Log.i(TAG, sbResponseBody.getAsString());

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}

export const handler = async (event) => {

    let body = "Hello World";

    if (event.body) {
        const input = JSON.parse(event.body);
        if (input.name) {
            body = "Hello " + input.name;
        }
    }

    return {
        statusCode: 200,
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            message: body
        })
    };
};