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    <title>topic Re: Login form not appear in my xamarin APP in Dropbox API Support &amp; Feedback</title>
    <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573260#M26751</link>
    <description>&lt;P&gt;We don't have any specific resources or samples for Xamarin in particular unfortunately. I'll pass this along as a feature request but I can't promise if or when that might be implemented.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;The authorization flow is covered in the &lt;A href="https://developers.dropbox.com/oauth-guide" target="_self" rel="noopener noreferrer"&gt;OAuth Guide&lt;/A&gt; and &lt;A href="https://www.dropbox.com/developers/documentation/http/documentation#authorization" target="_self" rel="noopener noreferrer"&gt;authorization documentation&lt;/A&gt; though. If something in the Dropbox API/OAuth flow isn't working as expected/documented, please share the details so we can take a look and investigate.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;The official Dropbox SDKs come with some working examples, such as for the official .NET and JavaScript SDKs, for instance:&lt;/P&gt;
&lt;UL&gt;
&lt;LI&gt;&lt;A href="https://github.com/dropbox/dropbox-sdk-dotnet/tree/main/dropbox-sdk-dotnet/Examples/OAuthPKCE" target="_blank"&gt;https://github.com/dropbox/dropbox-sdk-dotnet/tree/main/dropbox-sdk-dotnet/Examples/OAuthPKCE&lt;/A&gt; &lt;/LI&gt;
&lt;LI&gt;&lt;A href="https://github.com/dropbox/dropbox-sdk-js/blob/main/examples/javascript/PKCE-backend/code_flow_example.js" target="_blank"&gt;https://github.com/dropbox/dropbox-sdk-js/blob/main/examples/javascript/PKCE-backend/code_flow_example.js&lt;/A&gt; &lt;/LI&gt;
&lt;/UL&gt;</description>
    <pubDate>Tue, 25 Jan 2022 16:39:15 GMT</pubDate>
    <dc:creator>Greg-DB</dc:creator>
    <dc:date>2022-01-25T16:39:15Z</dc:date>
    <item>
      <title>Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572873#M26732</link>
      <description>&lt;P&gt;A few days in my android App that uses Dropbox.Api (v. 4.9.4) when&amp;nbsp;OAuth2Authenticator loads the login form, user and password fields are not displayed.&lt;/P&gt;</description>
      <pubDate>Mon, 24 Jan 2022 13:55:19 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572873#M26732</guid>
      <dc:creator>LSE</dc:creator>
      <dc:date>2022-01-24T13:55:19Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572936#M26735</link>
      <description>&lt;P&gt;var auth = new OAuth2Authenticator(&lt;BR /&gt;clientId: apikey, // your OAuth2 client id&lt;BR /&gt;scope: "", // The scopes for the particular API you're accessing. The format for this will vary by API.&lt;BR /&gt;authorizeUrl: authorizeUri, // the auth URL for the service&lt;BR /&gt;redirectUrl: callbackUri,&lt;BR /&gt;isUsingNativeUI: false); // the redirect URL for the service&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;This represents at the moment how our "OAuth2Authenticator" is setted.&lt;BR /&gt;By setting the parameter "isUsingNativeUI" to TRUE,&amp;nbsp; the GUI is correctly displayed (with pass and user filds) but I cannot intercept the opening of the redirect page and capture the token.&lt;BR /&gt;&lt;BR /&gt;&lt;/P&gt;&lt;P&gt;I also tried to update to the latest version of the DropBox API but they had no impact&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Can someone help me?&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Mon, 24 Jan 2022 17:27:22 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572936#M26735</guid>
      <dc:creator>LSE</dc:creator>
      <dc:date>2022-01-24T17:27:22Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572957#M26736</link>
      <description>&lt;P&gt;[Cross-linking for reference: &lt;A href="https://stackoverflow.com/questions/70837899/dropbox-login-username-and-password-filds-hidden-xamarin-native" target="_blank"&gt;https://stackoverflow.com/questions/70837899/dropbox-login-username-and-password-filds-hidden-xamarin-native&lt;/A&gt; ]&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;Please note that the &lt;A href="https://github.com/dropbox/dropbox-sdk-dotnet" target="_self"&gt;official Dropbox API v2 .NET SDK&lt;/A&gt; does not officially support Xamarin. Given that, and the version number you mentioned, it sounds like you're referring to &lt;A href="https://www.nuget.org/packages/Xamarin.Dropbox.Api" target="_self"&gt;the Xamarin.Dropbox.Api library&lt;/A&gt;, which is not owned or supported by Dropbox.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;In any case, Dropbox does not support processing the OAuth app authorization flow in a web view like OAuth2Authenticator apparently uses with your original configuration. The OAuth app authorization flow should be processed in the user's system browser. See &lt;A href="https://www.dropbox.com/developers/documentation/http/documentation#oauth2-authorize" target="_self"&gt;here&lt;/A&gt; for more information.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;It sounds like using the "isUsingNativeUI" option might be sending it to a supported system browser? Please refer to the &lt;A href="https://developers.dropbox.com/oauth-guide" target="_self"&gt;OAuth Guide&lt;/A&gt; and &lt;A href="https://www.dropbox.com/developers/documentation/http/documentation#authorization" target="_self"&gt;authorization documentation&lt;/A&gt; for information on using the OAuth flow, such as how to get the result from a redirect URI, for instance. For client-side apps, you should use the PKCE version.&lt;/P&gt;</description>
      <pubDate>Mon, 24 Jan 2022 18:20:32 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/572957#M26736</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2022-01-24T18:20:32Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573245#M26746</link>
      <description>&lt;P&gt;At the moment, I'm able to show the login form correctly using an exthernal browser but I can't intercept the redirect URI, capture the token and use it.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;I have tried many solutions, but none of them allow me to complete the authentication phase correctly&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;About &lt;SPAN&gt;OAuth flow-&lt;/SPAN&gt;PKCE version, as you suggested, I have not found sufficient examples or documentation to develop a solution with it.&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Can you help me whit this?&lt;BR /&gt;Or link some examples in xamarin-android?&lt;/P&gt;</description>
      <pubDate>Tue, 25 Jan 2022 15:36:27 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573245#M26746</guid>
      <dc:creator>LSE</dc:creator>
      <dc:date>2022-01-25T15:36:27Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573260#M26751</link>
      <description>&lt;P&gt;We don't have any specific resources or samples for Xamarin in particular unfortunately. I'll pass this along as a feature request but I can't promise if or when that might be implemented.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;The authorization flow is covered in the &lt;A href="https://developers.dropbox.com/oauth-guide" target="_self" rel="noopener noreferrer"&gt;OAuth Guide&lt;/A&gt; and &lt;A href="https://www.dropbox.com/developers/documentation/http/documentation#authorization" target="_self" rel="noopener noreferrer"&gt;authorization documentation&lt;/A&gt; though. If something in the Dropbox API/OAuth flow isn't working as expected/documented, please share the details so we can take a look and investigate.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;The official Dropbox SDKs come with some working examples, such as for the official .NET and JavaScript SDKs, for instance:&lt;/P&gt;
&lt;UL&gt;
&lt;LI&gt;&lt;A href="https://github.com/dropbox/dropbox-sdk-dotnet/tree/main/dropbox-sdk-dotnet/Examples/OAuthPKCE" target="_blank"&gt;https://github.com/dropbox/dropbox-sdk-dotnet/tree/main/dropbox-sdk-dotnet/Examples/OAuthPKCE&lt;/A&gt; &lt;/LI&gt;
&lt;LI&gt;&lt;A href="https://github.com/dropbox/dropbox-sdk-js/blob/main/examples/javascript/PKCE-backend/code_flow_example.js" target="_blank"&gt;https://github.com/dropbox/dropbox-sdk-js/blob/main/examples/javascript/PKCE-backend/code_flow_example.js&lt;/A&gt; &lt;/LI&gt;
&lt;/UL&gt;</description>
      <pubDate>Tue, 25 Jan 2022 16:39:15 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573260#M26751</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2022-01-25T16:39:15Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573351#M26752</link>
      <description>&lt;P&gt;I'm having the same issue. &amp;nbsp;I suspect something changed recently on the way the the Dropbox page is created. &amp;nbsp;This was working awhile back (not sure how long as the tokens were logging it in as expected). &amp;nbsp;After a logout and tried to log back in, the User &amp;amp; Password fields are missing and the page is drawn incorrectly.&lt;/P&gt;</description>
      <pubDate>Tue, 25 Jan 2022 21:41:58 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573351#M26752</guid>
      <dc:creator>OnCore</dc:creator>
      <dc:date>2022-01-25T21:41:58Z</dc:date>
    </item>
    <item>
      <title>Re: Login form not appear in my xamarin APP</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573577#M26761</link>
      <description>&lt;P&gt;Well whatever it was that got broken by DB is now Working again! &amp;nbsp;Out of nowhere the page is now displaying properly. &amp;nbsp;Pfew. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@FBF7D2AB59A0D6E861EBF6A36F93B7E2/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 26 Jan 2022 18:03:12 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Login-form-not-appear-in-my-xamarin-APP/m-p/573577#M26761</guid>
      <dc:creator>OnCore</dc:creator>
      <dc:date>2022-01-26T18:03:12Z</dc:date>
    </item>
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