c# - Xamarin.Forms Google API Authenticating Users with an Identity Provider -


i still getting used xamarin.forms , on basic level. went through many articles issue, end couldn't resolve it. so...

currently trying add google authentication inside xamarin.forms application, use droid , ios (no wp). far following guide here. using xamarin.auth authenticate google.

here part source code.

      private async void googlesheetsbutton_tapped()     {         string clientid = null;         string redirecturi = null;          if (device.runtimeplatform == device.ios)         {             clientid = constants.iosclientid;             redirecturi = constants.iosredirecturl;         }         else if (device.runtimeplatform == device.android)         {             clientid = constants.androidclientid;             redirecturi = constants.androidredirecturl;         }          var authenticator = new oauth2authenticator(             clientid,             null,             constants.scope,             new uri(constants.authorizeurl),             new uri(redirecturi),             new uri(constants.accesstokenurl),             null,             true);          authenticator.completed += onauthcompleted;         authenticator.error += onautherror;          authenticationstate.authenticator = authenticator;          var presenter = new xamarin.auth.presenters.oauthloginpresenter();         presenter.login(authenticator);     }

the problem coming after method complete it's work. after last line:

      presenter.login(authenticator);

everything looks alright , debugging following compiler goes out of method without errors, receive exception, can see here. it's "no compatible code running".

here more information regarding source code:

  • source of "constants" class used client ids , urls
      public static class constants     {         public static string appname = "....";          // oauth         // google login, configure @ https://console.developers.google.com/         public static string iosclientid = "6.....apps.googleusercontent.com";         public static string androidclientid = "6.....apps.googleusercontent.com";          // these values not need changing         public static string scope = "https://www.googleapis.com/auth/userinfo.email";         public static string authorizeurl = "https://accounts.google.com/o/oauth2/auth";         public static string accesstokenurl = "https://www.googleapis.com/oauth2/v4/token";         public static string userinfourl = "https://www.googleapis.com/oauth2/v2/userinfo";          // set these reversed ios/android client ids, :/oauth2redirect appended         public static string iosredirecturl = "com.googleusercontent.apps.6......h:/oauth2redirect";         public static string androidredirecturl = "com.googleusercontent.apps.6......l:/oauth2redirect";     }
  • source of implemented methods on authentication complete/error, in fact still cannot hit because of error
       async void onauthcompleted(object sender, authenticatorcompletedeventargs e)     {         var authenticator = sender oauth2authenticator;         if (authenticator != null)         {             authenticator.completed -= onauthcompleted;             authenticator.error -= onautherror;         }          googleloginuser user = null;         if (e.isauthenticated)         {             var request = new oauth2request("get", new uri(constants.userinfourl), null, e.account);             var response = await request.getresponseasync();             if (response != null)             {                 string userjson = await response.getresponsetextasync();                 user = jsonconvert.deserializeobject(userjson);             }              if (_account != null)             {                 _store.delete(_account, constants.appname);             }              await _store.saveasync(_account = e.account, constants.appname);             await displayalert("email address", user.email, "ok");         }     }      void onautherror(object sender, authenticatorerroreventargs e)     {         var authenticator = sender oauth2authenticator;         if (authenticator != null)         {             authenticator.completed -= onauthcompleted;             authenticator.error -= onautherror;         }          var message = e.message;     }
  • source of android mainactivity added
      public class mainactivity : formsappcompatactivity     {         protected override void oncreate(bundle bundle)         {             tablayoutresource = resource.layout.tabbar;             toolbarresource = resource.layout.toolbar;              base.oncreate(bundle);              forms.init(this, bundle);             global::xamarin.auth.presenters.xamarinandroid.authenticationconfiguration.init(this, bundle);              mobilebarcodescanner.initialize(application);              loadapplication(new app());         }     }
  • source of urlschemeinterceptoractivity
      [activity(label = "customurlschemeinterceptoractivity", nohistory = true, launchmode = launchmode.singletop)]     [intentfilter(new[] { intent.actionview }, categories = new[] { intent.categorydefault, intent.categorybrowsable }, dataschemes = new[] { "com.googleusercontent.apps.6......l" }, datapath = "/oauth2redirect")]     public class customurlschemeinterceptoractivity : activity     {         protected override void oncreate(bundle savedinstancestate)         {             base.oncreate(savedinstancestate);              var uri = new uri(intent.data.tostring());              authenticationstate.authenticator.onpageloading(uri);              finish();         }     }

here main articles went through => link 1, link 2 , link 3, still couldn't resolve issue.

i not sure error comes from, or can can continue debugging resolve issue.

thanks in advance

solution

  1. change android compiler android 7.0 inside android project properties. screenshot
  2. make sure inside android manifest target sdk version. screenshot
  3. update "xamarin.android.*" nuget packages minimum version 25.4.0.1. they're 23.3.0. found problems dependencies on updating it, make manual upload. went , download manually each package , move packages folder. created own package source , give path folder packages , used install downloaded nuget packages. screenshot
  4. after issue solved.

please update android sdk api 24 or higher , set compile version project. , update referred assemblies custom tabs , dependencies v25.x.x. thats it. should able working.

vijay.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more