如果用户不检查Xamarin Android中的单选按钮，如何显示异常消息？

问题描述：

嗨如果用户没有检查单选按钮，我需要在屏幕上显示一条错误消息。在这个代码中，有4个单选按钮分为13个单选按钮。我试图使用try/catch和if/else但屏幕仍然没有显示Toast错误消息。另一个疑问：我知道广播组不允许一个人选择超过1个选项，但我怎样才能做一个让用户只需选择一个单一广播组的按钮的exceleiton？ 例如：现在我必须选择至少4个按键（每个无线电组1），但我想这样做的方式，随便一个组中的一个就可以了如果用户不检查Xamarin Android中的单选按钮，如何显示异常消息？

下面是代码

using Android.App; 
using Android.Content.PM; 
using Android.Content.Res; 
using Android.OS; 
using Android.Support.V4.Widget; 
using Android.Views; 
using Android.Widget; 
using System.Collections; 
using Android.Support.V7.App; 
using Android.Support.V4.View; 
using Android.Support.Design.Widget; 
using Auth0.OidcClient; 
using Android.Content; 
using IdentityModel.OidcClient; 
using Android.Graphics; 
using System.Net; 
using System; 
using Android.Runtime; 
using Android.Text.Method; 
using System.Text; 
namespace whirlpoolapp 
{ 
    [Activity(Label = "whirlpoolapp", MainLauncher = true)] 
    [IntentFilter(
    new[] { Intent.ActionView }, 
    Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable }, 
    DataScheme = "whirlpoolapp.whirlpoolapp", 
    DataHost = "lucasmoreira.auth0.com", 
    DataPathPrefix = "/android/whirlpoolapp.whirlpoolapp/callback")] 
    public class MainActivity : Activity 
    { 
     private ArrayList enderecos; 
     TextView queroreconhecer; 
     TextView crie; 
     TextView conquiste; 
     TextView entregue; 
     TextView viva; 
     TextView comentar; 
     EditText comentário; 
     Spinner spinner; 
     ArrayAdapter adapter; 
     RadioGroup rdgcrie; 
     RadioGroup rdgconquiste; 
     RadioGroup rdgentregue; 
     RadioGroup rdgviva; 
     Button enviar; 
     private Auth0Client client; 
     private AuthorizeState authorizeState; 
     ProgressDialog progress; 

     protected override void OnResume() 
     { 
      base.OnResume(); 

      if (progress != null) 
      { 
       progress.Dismiss(); 

       progress.Dispose(); 
       progress = null; 
      } 
     } 

     protected override async void OnNewIntent(Intent intent) 
     { 
      base.OnNewIntent(intent); 

      var loginResult = await client.ProcessResponseAsync(intent.DataString, authorizeState); 

      var sb = new StringBuilder(); 
      if (loginResult.IsError) 
      { 
       sb.AppendLine($"An error occurred during login: {loginResult.Error}"); 
      } 
      else 
      { 
       sb.AppendLine($"ID Token: {loginResult.IdentityToken}"); 
       sb.AppendLine($"Access Token: {loginResult.AccessToken}"); 
       sb.AppendLine($"Refresh Token: {loginResult.RefreshToken}"); 

       sb.AppendLine(); 

       sb.AppendLine("-- Claims --"); 
       foreach (var claim in loginResult.User.Claims) 
       { 
        sb.AppendLine($"{claim.Type} = {claim.Value}"); 
       } 
      } 


     } 

     private async void LoginButtonOnClick(object sender, EventArgs eventArgs) 
     { 


      progress = new ProgressDialog(this); 
      progress.SetTitle("Log In"); 
      progress.SetMessage("Please wait while redirecting to login screen..."); 
      progress.SetCancelable(false); // disable dismiss by tapping outside of the dialog 
      progress.Show(); 

      // Prepare for the login 
      authorizeState = await client.PrepareLoginAsync(); 

      // Send the user off to the authorization endpoint 
      var uri = Android.Net.Uri.Parse(authorizeState.StartUrl); 
      var intent = new Intent(Intent.ActionView, uri); 
      intent.AddFlags(ActivityFlags.NoHistory); 
      StartActivity(intent); 
     } 

     protected override void OnCreate(Bundle bundle) 
     { 
      base.OnCreate(bundle); 

      SetContentView(Resource.Layout.Main); 
      client = new Auth0Client(new Auth0ClientOptions 
      { 
       Domain = Resources.GetString(Resource.String.auth0_domain), 
       ClientId = Resources.GetString(Resource.String.auth0_client_id), 
       Activity = this 
      }); 
      //preenche o arraylist com os dados 
      GetEmails(); 
      //cria a instância do spinner declarado no arquivo Main 
      spinner = FindViewById<Spinner>(Resource.Id.spnDados); 
      //cria textview 
      queroreconhecer = FindViewById<TextView>(Resource.Id.txtReconhecer); 
      crie = FindViewById<TextView>(Resource.Id.txtCrie); 
      conquiste = FindViewById<TextView>(Resource.Id.txtConquiste); 
      entregue = FindViewById<TextView>(Resource.Id.txtEntregue); 
      viva = FindViewById<TextView>(Resource.Id.txtViva); 
      comentar = FindViewById<TextView>(Resource.Id.txtComentário); 
      comentário = FindViewById<EditText>(Resource.Id.edtComentario); 
      rdgcrie = FindViewById<RadioGroup>(Resource.Id.rdgCrie); 
      rdgconquiste = FindViewById<RadioGroup>(Resource.Id.rdgConquiste); 
      rdgentregue = FindViewById<RadioGroup>(Resource.Id.rdgEntregue); 
      rdgviva = FindViewById<RadioGroup>(Resource.Id.rdgViva); 
      adapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleListItem1, enderecos); 
      spinner.Adapter = adapter; 
      spinner.ItemSelected += Spinner_ItemSelected; 
      enviar = FindViewById<Button>(Resource.Id.button1); 
      enviar.Click += enviar_Click; 
      void GetEmails() 
      { 
       enderecos = new ArrayList(); 
       enderecos.Add("Escolha um colaborador abaixo"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("ana_carolina_simoes @whirlpool.com"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("ricardo_matos_campaneruti @whirlpool.com"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
       enderecos.Add("[email protected]"); 
      }// fim getEmails 

      void Spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e) 
      { 
       Spinner spinner = (Spinner)sender; 
       string toast = string.Format("Colaborador selecionado: {0}", spinner.GetItemAtPosition(e.Position)); 
       Toast.MakeText(this, toast, ToastLength.Long).Show(); 
       string texto = toast; 


      } 


     } 
     void enviar_Click(object sender, EventArgs e) 
     { try { 
      RadioButton rdbgrupo1 = FindViewById<RadioButton>(rdgconquiste.CheckedRadioButtonId); 
      RadioButton rdbgrupo2 = FindViewById<RadioButton>(rdgcrie.CheckedRadioButtonId); 
      RadioButton rdbgrupo3 = FindViewById<RadioButton>(rdgviva.CheckedRadioButtonId); 
      RadioButton rdbgrupo4 = FindViewById<RadioButton>(rdgentregue.CheckedRadioButtonId); 
      if (rdbgrupo1.Selected == false || rdbgrupo2.Selected == false || rdbgrupo3.Selected == false || rdbgrupo4.Selected == false) 
       { 
       string excecao = "Ao menos um botão de cada campo deve ser selecionado e o comentário deve ser preenchido"; 
       Toast.MakeText(this, excecao, ToastLength.Long).Show(); 
       } 
      else 
       { 
        String emailescolhido = spinner.SelectedItem.ToString(); 
        String campocomentario = comentário.Text; 
        string message = "Ao menos um botão de cada campo deve ser selecionado"; 
        Toast.MakeText(ApplicationContext, message, ToastLength.Long).Show(); 
        var email = new Intent(Android.Content.Intent.ActionSend); 
        //send to 
        email.PutExtra(Android.Content.Intent.ExtraEmail, 
        new string[] { "" + emailescolhido }); 
        //cc to 
        email.PutExtra(Android.Content.Intent.ExtraCc, 
        new string[] { "[email protected]" }); 
        //subject 
        email.PutExtra(Android.Content.Intent.ExtraSubject, "SABIA QUE VOCÊ FOI RECONHECIDO?"); 
        //content 
        email.PutExtra(Android.Content.Intent.ExtraText, 
        "Você foi reconhecido pelo(s) valor(es) de: " + rdbgrupo1.Text + " , " + rdbgrupo2.Text + " , " + rdbgrupo3.Text + " e " + rdbgrupo4.Text); 
        email.PutExtra(Android.Content.Intent.ExtraText, "" + campocomentario); 
        email.SetType("message/rfc822"); 
        StartActivity(email); 
       } 

      } 
      catch (Java.Lang.Exception ex) 
      { 
       string excecao = "Ao menos um botão de cada campo deve ser selecionado e o comentário deve ser preenchido"; 
       Toast.MakeText(this, excecao, ToastLength.Long).Show(); 

      } 


     } 




    } 
}

我怀疑你最好的方法是在列表中添加更多属性，过滤这些属性，然后检查每组按钮。另外我希望那些是虚拟的电子邮件，否则业主会希望他们删除。 – ti7

你是什么意思“我想以某种方式做到这一点，只要其中一个团队足够好”？你能否详细说明一下？ –

而不是选择4个按钮（每个rdgroup的1个）我想让用户选择1个收音机组。现在，当我尝试这样做时，按钮会返回空白和应用程序中断的异常 –

答

如何显示异常消息，如果用户不检查Xamarin的Android单选按钮？

你可以使用radioGroup.CheckedRadioButtonId得到结果的RadioGroup是否检查，在空选择，返回值为-1。

public int RadioGroupIsChecked(RadioGroup radioGroup) 
{ 
    //-1 means empty selection 
    return radioGroup.CheckedRadioButtonId; 
} 

//When user doesn't check a radio button, show a Toast 
if (RadioGroupIsChecked(group) == -1 || RadioGroupIsChecked(group2) == -1 || RadioGroupIsChecked(group3) == -1 || RadioGroupIsChecked(group4) == -1) 
{ 
    string excecao = "Ao menos um botão de cada campo deve ser selecionado e o comentário deve ser preenchido"; 
    Toast.MakeText(this, excecao, ToastLength.Long).Show(); 
}

如果用户不检查Xamarin Android中的单选按钮，如何显示异常消息？

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