如何在mvvmcross中隐藏ViewModel更新上的Android操作栏?
我有一个LobbyView和一个LobbyViewModel,它是使用MvvmCross for Android实现的 LobbyViewModel具有LoginCommand,用于对用户进行身份验证。如果用户经过身份验证,那么我需要隐藏LobbyView中定义的actionbar 我不知道如何访问viewmodel中的actionbar.Hide(),或者是否有其他方法可以访问它 ViewModel的代码:如何在mvvmcross中隐藏ViewModel更新上的Android操作栏?,android,xamarin.android,mvvmcross,Android,Xamarin.android,Mvvmcross,我有一个LobbyView和一个LobbyViewModel,它是使用MvvmCross for Android实现的 LobbyViewModel具有LoginCommand,用于对用户进行身份验证。如果用户经过身份验证,那么我需要隐藏LobbyView中定义的actionbar 我不知道如何访问viewmodel中的actionbar.Hide(),或者是否有其他方法可以访问它 ViewModel的代码: public class LobbyViewModel : MvxViewModel
public class LobbyViewModel : MvxViewModel
{
ISmartfoxService _smarfoxservice;
private string _username;
private string _password;
private string _title = "Connect To SfsServer";
private bool _LoginSuccces = false;
private string _LoginVisibility = "VISIBLE";
private int _ListVisibility = 8;
private string _LoginError = "Connecting...";
public LobbyViewModel(ISmartfoxService smartfoxservice)
{
_smarfoxservice = smartfoxservice;
}
public string UserName
{
get { return _username; }
set { SetProperty(ref _username, value); }
}
public string Pass
{
get
{
return _password;
}
set
{
SetProperty(ref _password, value);
}
}
public string Title
{
get { return _title; }
set { SetProperty(ref _title, value); }
}
public bool LoginSuccess
{
get { return _LoginSuccces; }
set
{
_LoginSuccces = value;
RaisePropertyChanged(() => LoginSuccess);
if (value == true)
{
LoginVisibility = "Gone";
}
}
}
public string LoginVisibility
{
get { return _LoginVisibility; }
set { _LoginVisibility = value; RaisePropertyChanged(() => LoginVisibility); }
}
public int ListVisibility
{
get { return _ListVisibility; }
set { _ListVisibility = value; RaisePropertyChanged(() => ListVisibility); }
}
public string LoginError
{
get { return _LoginError; }
set { _LoginError = value; RaisePropertyChanged(() => LoginError); }
}
// A Sample Login Command which notifies the Lobbyviewmodel about login status
public ICommand LoginCommand
{
get
{
return new MvxCommand(() =>
{
IPhpService service = new PHPService();
LoginResponse result = await service.TryLogin(UserName,Pass);
if(result.isLogged==true)
{
LoginSuccess=true;
// Here, I would to like call the android action bar's Hide method of LobbyView.
}
else
LoginSuccess=false;
});
}
}
}
大堂视图代码:
public class LobbyView : MvxActivity
{
public CustomAdapter customAdapter;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.LobbyView);
var set = this.CreateBindingSet<LobbyView, LobbyViewModel>();
Button btnConnect = (Button)FindViewById(Resource.Id.btnlogin);
EditText edtUserName = (EditText)FindViewById(Resource.Id.edtlogin);
EditText edtPassword= (EditText)FindViewById(Resource.Id.edtpassword);
TextView txtErrorMessage = (TextView)FindViewById(Resource.Id.txtloginerror);
set.Bind(txtErrorMessage).For(tr => tr.Text).To(vm => vm.LoginError);
set.Bind(edtUserName).For("Text").To(vm => vm.UserName);
set.Bind(edtPassword).For("Text").To(vm => vm.Pass);
set.Bind(btnConnect).For("Text").To(vm => vm.Title);
set.Bind(btnConnect).For("Click").To(vm => vm.LoginCommand);
set.Apply();
ActionBar actionBar = this.ActionBar;
actionBar.SetDisplayShowHomeEnabled(false);
actionBar.SetDisplayShowTitleEnabled(false);
LayoutInflater inflater = LayoutInflater.From(this);
View mCustomeView=inflater.Inflate(Resource.Layout.custom_action_bar,null);
actionBar.SetDisplayOptions(ActionBarDisplayOptions.ShowCustom, ActionBarDisplayOptions.ShowHome);
actionBar.SetCustomView(Resource.Layout.custom_action_bar);
actionBar.SetDisplayShowCustomEnabled(true);
}
}
公共类游说视图:MVX活动
{
公共自定义适配器;
创建时受保护的覆盖无效(捆绑包)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.LobbyView);
var set=this.CreateBindingSet();
按钮btnConnect=(按钮)FindViewById(Resource.Id.btnlogin);
EditText edtUserName=(EditText)FindViewById(Resource.Id.edtlogin);
EditText-edtPassword=(EditText)FindViewById(Resource.Id.edtPassword);
TextView txtErrorMessage=(TextView)FindViewById(Resource.Id.txtloginerror);
set.Bind(txtErrorMessage).For(tr=>tr.Text).To(vm=>vm.LoginError);
set.Bind(edtUserName).For(“Text”).To(vm=>vm.UserName);
set.Bind(edtPassword).For(“Text”).To(vm=>vm.Pass);
set.Bind(btnConnect).For(“Text”).To(vm=>vm.Title);
set.Bind(btnConnect).For(“单击”).To(vm=>vm.LoginCommand);
set.Apply();
ActionBar ActionBar=this.ActionBar;
actionBar.SetDisplayShowHomeEnabled(false);
actionBar.SetDisplayShowTitleEnabled(false);
LayoutFlater充气机=LayoutFlater.From(本机);
View mCustomeView=inflater.Inflate(Resource.Layout.custom\u action\u bar,null);
actionBar.SetDisplayOptions(ActionBarDisplayOptions.ShowCustom、ActionBarDisplayOptions.ShowHome);
SetCustomView(Resource.Layout.custom\u action\u bar);
actionBar.SetDisplayShowCustomEnabled(true);
}
}
您可以做的是:
ViewModel.PropertyChanged += (sender, e) =>
{
if (e.PropertyName == "LoginSuccess" && ViewModel.LoginSuccess)
{
//Hide Actionbar here
}
}
要启用ViewModel类型化名称,应向ViewModel添加泛型:
public class LobbyView : MvxActivity<LobbyViewModel>
公共类游说视图:MVX活动
与@Martijn00 answer不同的是,当特定属性发生更改时,弱订阅事件
_loginSuccessSubscription = ViewModel.WeakSubscribe(() => ViewModel.LoginSucess, LoginSuccessChanged);
private void LoginSuccessChanged(object sender, PropertyChangedEventArgs args)
{
if (ViewModel.LoginSuccess)
{
// do stuff on login...
// Hide ToolBar (this in this context is the Activity or Fragment)
this.SupportActionbar.Hide();
}
}
这样,您就没有对事件的强引用,您可以轻松地休息。正如旁注:ActionBar被弃用,取而代之的是工具栏。此外,您还应该使用MVXAppCompativeActivity而不是set.Bind,您可以在Android中直接在xml中绑定。(按钮)在Xamarin中不建议使用FindViewById强制转换。请改用FindViewById()。您可以使用
设置{SetProperty(ref-LoginError,value);}
而不是设置{SetProperty(ref-LoginError,value);}
。这将为您带来变化。Martijn00,感谢您的想法,即使在使用MvxAppCompactActivity之后,我如何根据需要隐藏操作栏。任何暗示这个例子的链接都很好。