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The AWS SDK for Android - Core module holds the classes that is used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.

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/**
 * Synchronous and asynchronous client classes for accessing AmazonCognitoIdentity.
 *
 * Amazon Cognito 
 * Amazon Cognito is a web service that delivers scoped temporary
 * credentials to mobile devices and other untrusted environments. Amazon
 * Cognito uniquely identifies a device and supplies the user with a
 * consistent identity over the lifetime of an application.
 * 
 * 
 * Using Amazon Cognito, you can enable authentication with one or more
 * third-party identity providers (Facebook, Google, or Login with
 * Amazon), and you can also choose to support unauthenticated access
 * from your app. Cognito delivers a unique identifier for each user and
 * acts as an OpenID token provider trusted by AWS Security Token Service
 * (STS) to access temporary, limited-privilege AWS credentials.
 * 
 * 
 * To provide end-user credentials, first make an unsigned call to GetId.
 * If the end user is authenticated with one of the supported identity
 * providers, set the Logins map with the identity provider
 * token. GetId returns a unique identifier for the user.
 * 
 * 
 * Next, make an unsigned call to GetCredentialsForIdentity. This call
 * expects the same Logins map as the GetId
 * call, as well as the IdentityID originally returned by
 * GetId . Assuming your identity pool has been configured
 * via the SetIdentityPoolRoles operation,
 * GetCredentialsForIdentity will return AWS credentials for
 * your use. If your pool has not been configured with
 * SetIdentityPoolRoles , or if you want to follow legacy
 * flow, make an unsigned call to GetOpenIdToken, which returns the
 * OpenID token necessary to call STS and retrieve AWS credentials. This
 * call expects the same Logins map as the
 * GetId call, as well as the IdentityID
 * originally returned by GetId . The token returned by
 * GetOpenIdToken can be passed to the STS operation
 *  AssumeRoleWithWebIdentity 
 * to retrieve AWS credentials.
 * 
 * 
 * If you want to use Amazon Cognito in an Android, iOS, or Unity
 * application, you will probably want to make API calls via the AWS
 * Mobile SDK. To learn more, see the
 *  AWS Mobile SDK Developer Guide 
 * .
 * 
 */
 package com.amazonaws.services.cognitoidentity;