Sep 07, 2011 Learn how to use AWS Mobile SDK which helps you build high quality mobile apps quickly and easily. Learn more: http://amzn.to/2iNkX09. Jan 25, 2018 Content for the AWS Mobile SDK for Android Developer Guide - awsdocs/aws-android-developer-guide. If nothing happens, download the GitHub extension for Visual Studio and try again. Joshbean Update CONTRIBUTING.md. AWS Mobile SDK for Android. So far, we have covered AWS SDK for IoT and AWS Mobile SDK for Android. Let's explore an example for the Transfer Utility to consume Amazon S3 services. Here we will upload a file from a mobile device and download a file to a mobile device. We will use Android Studio, Amazon Cognito, Amazon S3, and Amazon IAM. Please perform the following steps. The AWS SDK for Android is an open-source software development kit, distributed under an Apache Open Source license.The SDK for Android provides libraries, code samples, and documentation to help developers build connected mobile applications using AWS.This guide explains how to get started with.
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Amazon DynamoDB is a fast, highly scalable, highly available, cost-effective, non-relational database service. Amazon DynamoDB removes traditional scalability limitations on data storage while maintaining low latency and predictable performance. The sample mobile application described here demonstrates how to store user preferences in Amazon DynamoDB. Because more and more people are using multiple mobile devices, connecting these devices to the cloud, and storing user preferences in the cloud, enables developers to provide a more uniform cross-device experience for their users.
This article shows sample code for the Android platform. The complete sample code and project files are included in the AWS SDK for Android. Links to the SDK are available at the end of this article.
To use the sample app, you'll need to deploy a token vending machine (TVM). A TVM is a cloud-based application that manages AWS credentials for users of mobile applications. To deploy the TVM, you'll first need to obtain your own AWS credentials: an Access Key ID and Secret Key.
If you haven't already signed up for Amazon Web Services (AWS), you will need to do that first to get your AWS credentials. You can sign up for AWS here. After you sign up, you can retrieve your credentials at this page. The credentials will be used to set up the TVM to authenticate users of AWS mobile applications. Sample Java web applications are available here: Anonymous TVM and Identity TVM (this sample uses Anonymous TVM).
Overview
In Amazon DynamoDB, a database is a collection of tables. A table is a collection of items, and each item is a collection of attributes. For our app, we create a single table to store our list of users and their preferences. Each item in the table represents an individual user. Each item has multiple attributes, which include the user's name and their preferences. Each item also has a hash key—in this case,
userNo
—which is the primary key for the table. The app demonstrates how to add and remove users, and modify and retrieve their preference data. The app also demonstrates how to create and delete Amazon DynamoDB tables.
Registering the Device with Token Vending Machine
In order to create an Amazon DynamoDB client, we must first register the mobile device with the token vending machine (TVM). For this sample, we use the Anonymous TVM to register the device. Then we store the UID and key returned by the TVM on the device.
Retrieving the Temporary Credentials from Token Vending Machine
The following code demonstrates how to request that the TVM generate temporary credentials, and how to store the returned credentials on the device.
Creating an Amazon DynamoDB Client
To make service requests to Amazon DynamoDB, you need to instantiate an Amazon DynamoDB client. The code below shows how to create an Amazon DynamoDB client for Android using the stored temporary credentials from the TVM.
Creating a User List (Table Creation)
Each user's preferences are stored as items in an Amazon DynamoDB table. The following code creates that table using the client we created above. Every Amazon DynamoDB table require a hash key. In this sample, we use
userNo
as the hash key for the table.Checking the Status of the Table (Table Description)
Before we can move to the next step (creating users), we must wait until the status of the tables is ACTIVE. To retrieve the status of the table, we use a describe table request. This request returns information about the table such as the name of the table, item count, creation date and time, and its status.
What Is Sdk For Android
Creating Users (Item Creation)
For each user, we'll create an item in the table. An item is a collection of attribute/value pairs. For each item, we'll have three attributes:
userNo
, firstName
, and lastName
. These are added to a put item request in order to create the item.Aws Mobile Sdk For Android Download Pc
Deleting Users (Item Deletion)
To remove a user from the list simply means deleting the corresponding item from the table. We specify the item we wish to delete using the hash key for the item.
Listing Users (Table Scan)
We can retrieve a collection of users with a scan request. A scan request simply scans the table and returns the results in an undetermined order. Scan is an expensive operation and should be used with care to avoid disrupting your higher priority production traffic on the table. See the Amazon DynamoDB developer guide for more recommendations for safely using the Scan operation.
Retrieving a User's Preferences (Item Retrieval)
Amazon Android Sdk
Knowing a user's
userNo
, the hash key of the table, it is easy to find the item for the user. This next snippet shows how to get all the attributes for an item using the hash key.Modifying User Preferences (Item Update)
The hash key also makes it easy to update an attribute for an item.
List Deletion (Table Deletion)
The easiest way to remove all the user preference data is to delete the Amazon DynamoDB table. The following code shows how:
Conclusion and Additional Resources
The code in this article demonstrates how to use Amazon DynamoDB as a storage device for your mobile application. You can find more information about Amazon DynamoDB here.
Sample apps that include the code from this article are provided with the AWS SDK for Android. You can download the SDK using the following link:
For more information about using AWS credentials with mobile applications see the following article:
Questions?
Please feel free to ask questions or provide comments in the Mobile Development Forum.
To develop your app using AWS, you must obtain AWS credentials with Amazon Cognito Identity, which is a credentials provider. By using it, you will be able to access the services without having to insert private credentials in your application's code.
Install Android Sdk Tools
To get AWS credentials, you must first create an identity pool. The identity pool stores user identity data specifically to your account. It has configurable IAM roles that allow you to specify which services your user will have access to. For more information, check the Step 3 of the official documentation 'Set Up the AWS Mobile SDK for Android'.
![Sdk Sdk](/uploads/1/2/5/0/125097944/669289784.png)
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To create an identity pool, follow these steps:
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- Log in to the Amazon Cognito Console.
- Click on 'Manage Federated Identities'.
- Click on 'Create new identity pool'.
- Insert a name for your identity pool and check the box to allow access to unauthenticated identities.
- Then, click on 'Create Pool' to finish.
- Click 'Allow' to create two default roles associated with your identity pool (one for authenticated users and the other one to unauthenticated users).
- To integrate Cognito Identity with your app, you should pass your credentials provider object to the constructor of the AWS client you are using. It should look like this: