Note 2<\/strong><\/span>: The\u00a0APIs, libraries, sample code and registration\u00a0process\u00a0are currently in preview.\u00a0This blog post is intended to show the possibilities of using O365 with Xamarin.<\/p>\n As we’ve seen before, Office 365 uses Azure Active Directory (AD) as the Identity Provider. Which\u00a0means that Azure Active Directory\u00a0is used to authenticate and authorize users. To allow OneDrive to be accessed from mobile apps, it is mandatory to register this app in AD.\u00a0You can follow our guide to registering an app with Active Directory<\/a> to learn how.<\/p>\n On the Configure<\/b> tab, click the Add Application<\/b> button at the bottom.<\/p>\n On next screen, select Office 365 SharePoint Online<\/b> to access the Files and Lists.<\/p>\n Once these services are selected, give access to the tasks that a user can perform with the app on the next screen.<\/p>\n Now we can\u00a0Save<\/b> this configuration and focus on the mobile part of our app.<\/p>\n In order to\u00a0use O365 services in your Xamarin app, you will need to add\u00a0the following NuGet packages to your project.<\/p>\n Add a new class to your project and name it Using ADAL, this app will fetch the Access Token from AD, as shown below. In this method, the second\u00a0parameter will depend on the platform on which the code is executing. For example, in\u00a0Android an Discovery Service helps find Service Endpoints. Create a new method Files in OneDrive or Lists from SharePoint in O365 can be accessed using By default, Just after the above code, create an adapter and use it to show the list of documents.<\/p>\n Last, call this Now you’ve got a fantastic foundation to build\u00a0multi-tenant, intranet, integrated mobile apps using Office 365. Office 365 has a huge number\u00a0of features which we’ll be highlighting in future guides and samples apps.<\/p>\n If you’re interested in exploring a sample project, you\u00a0can download a copy of\u00a0the source code from\u00a0this blog post on GitHub<\/a>\u00a0and discuss this topic in forums.<\/a><\/p>\n <\/p>\n <\/p>\n \t\t<\/p>\n","protected":false},"excerpt":{"rendered":" Enterprises with a Bring Your Own Device (BYOD) strategy face the challenge of securing their resources on various types of devices. For example, organizations want to share documents with their employees, allow them to collaborate on documents\u00a0with coworkers, and more. Employees want to sync these documents with a variety of\u00a0devices, such as tablets, laptops and […]<\/p>\n","protected":false},"author":549,"featured_media":39167,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,3],"tags":[4],"class_list":["post-17407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developers","category-enterprise","tag-xamarin-platform"],"acf":[],"blog_post_summary":" Enterprises with a Bring Your Own Device (BYOD) strategy face the challenge of securing their resources on various types of devices. For example, organizations want to share documents with their employees, allow them to collaborate on documents\u00a0with coworkers, and more. Employees want to sync these documents with a variety of\u00a0devices, such as tablets, laptops and […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/posts\/17407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/users\/549"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/comments?post=17407"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/posts\/17407\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/media\/39167"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/media?parent=17407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/categories?post=17407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/xamarin\/wp-json\/wp\/v2\/tags?post=17407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Step 1: Register the app<\/h2>\n
Step 2: Give access to the O365 APIs<\/h2>\n
![\"Configure-Access-01\"](\"\/wp-content\/uploads\/sites\/44\/2019\/04\/Configure-Access-01-1024x845.png\")
<\/a><\/p>\n![\"Configure-Access-02\"](\"\/wp-content\/uploads\/sites\/44\/2019\/04\/Configure-Access-02-1024x644.png\")
<\/a><\/p>\n![\"Configure-Access-03\"](\"\/wp-content\/uploads\/sites\/44\/2019\/04\/Configure-Access-03.png\")
<\/a><\/p>\nStep 3: Build mobile app<\/h2>\n
Step 3a: Refer NuGet packages<\/h3>\n
\n
Step 3b: Declare variables<\/h3>\n
AuthenticationHelper<\/code>. Declare the variable at class and global level as outlined below:<\/p>\n\npublic static readonly string DiscoveryServiceResourceId = "https:\/\/api.office.com\/discovery\/";\npublic const string Authority = "https:\/\/login.windows.net\/common";\npublic static readonly Uri DiscoveryServiceEndpointUri =\nnew Uri("https:\/\/api.office.com\/discovery\/v1.0\/me\/");\npublic static Uri returnUri = new Uri("http:\/\/Xam-O365-Integration");\npublic static string clientId = "32088804-9284-451f-9ee6-2b70507a99cf";\npublic static AuthenticationContext authContext = null;\n<\/pre>\nStep 3c: Write method to acquire AccessToken<\/h3>\n
Activity<\/code> is passed, but on iOS and Windows Phone the second\u00a0parameter is not required.<\/p>\n\npublic static async Task<AuthenticationResult> GetAccessToken (string serviceResourceId, Activity activity)\n{\n authContext = new AuthenticationContext(Authority);\n if (authContext.TokenCache.ReadItems().Count() > 0)\n authContext = new AuthenticationContext(authContext.TokenCache.ReadItems().First().Authority);\n var authResult = await authContext.AcquireTokenAsync(serviceResourceId, clientId, returnUri, new AuthorizationParameters(activity));\n return authResult;\n}\n<\/pre>\nStep 3d: Create DiscoveryClient<\/h3>\n
GetDocumentsList()<\/code>, which will create DiscoveryClient<\/code> for further use.<\/p>\n\nList<string> fileNames = new List<string>();\n\nDiscoveryClient discoveryClient = new DiscoveryClient(async () => {\n var authResult = await AuthenticationHelper.GetAccessToken(AuthenticationHelper.DiscoveryServiceResourceId, this);\n return authResult.AccessToken;\u00a0\n });\n\nvar appCapabilities = await discoveryClient.DiscoverCapabilitiesAsync();\nvar myFilesCapability = appCapabilities.Where(s => s.Key == "MyFiles")\n .Select(p =>; new { \n Key = p.Key,\n ServiceResourceId = p.Value.ServiceResourceId,\n ServiceEndPointUri = p.Value.ServiceEndpointUri \n })\n .FirstOrDefault();\n<\/pre>\nStep 3e: Create SharePointClient<\/h3>\n
SharePointClient<\/code>. This object again encapsulates REST services provided by O365.<\/p>\n\nif (myFilesCapability != null)\n{\n SharePointClient myFilesClient = new SharePointClient(myFilesCapability.ServiceEndPointUri,\n async () => {\n var authResult = await AuthenticationHelper.GetAccessToken(myFilesCapability.ServiceResourceId, this);\n return authResult.AccessToken;\n });\n\n var myFilesResult = await myFilesClient.Files.ExecuteAsync();\n do\n {\n var myFiles = myFilesResult.CurrentPage;\n foreach (var myFile in myFiles)\n {\n fileNames.Add(myFile.Name);\n }\n myFilesResult = await myFilesResult.GetNextPageAsync();\n } while (myFilesResult != null);\n}\n<\/pre>\nStep 3f: List files<\/h3>\n
MainActivity<\/code> is derived from Activity<\/code>. Change this behavior to derive from ListActivity<\/code> to display a list in the app.<\/p>\n\nthis.ListAdapter = new ArrayAdapter(this,\n Android.Resource.Layout.SimpleListItem1,\n fileNames.ToArray());\n<\/pre>\n
GetDocumentsList<\/code> method from the OnCreate<\/code> method and run the app. It should show the following result, listing files from your OneDrive account.<\/p>\n![\"OneDrive-Mobile-Screenshot\"](\"\/wp-content\/uploads\/sites\/44\/2019\/04\/OneDrive-Mobile-Screenshot-1024x656.png\")
<\/a><\/p>\n