[英]Xamarin.Forms. Android. Can't hide keyboard
当我的 Entry 控件获得焦点时,会出现一个虚拟键盘。 我需要隐藏键盘并仅在用户明确调用时显示它。 我尝试使用InputMethodManager
隐藏键盘,但是在调用HideSoftInputFromWindow(...)
方法后,键盘仍然保留在屏幕上。 ToggleSoftInputFromWindow(...)
方法也不起作用。
.NET 标准项目:
public partial class App : Application
{
public IKeyboardService KeyboardService { get; set; }
public App()
{
InitializeComponent();
MainPage = new MainPage( new MainViewModel() );
}
}
public partial class CustomEntry
{
public CustomEntry()
{
InitializeComponent();
Focused += OnCustomEntryFocused;
}
private void OnCustomEntryFocused( object sender, FocusEventArgs e )
{
( (App)App.Current ).KeyboardService.HideKeyboard();
}
}
public interface IKeyboardService
{
void HideKeyboard();
}
安卓项目:
public class KeyboardService : IKeyboardService
{
public void HideKeyboard()
{
var activity = MainActivity.Instance;
var imm = activity.GetSystemService( Context.InputMethodService ) as InputMethodManager;
if ( imm != null )
{
var token = activity.CurrentFocus?.WindowToken;
imm.HideSoftInputFromWindow( token, HideSoftInputFlags.NotAlways );
//imm.ToggleSoftInputFromWindow( token, ShowSoftInputFlags.None, HideSoftInputFlags.NotAlways );
}
}
}
如何隐藏键盘?
您可以通过在Entry
上切换IsEnabled
以编程方式在 Xamarin.Forms 中隐藏键盘
public class CustomEntry
{
public CustomEntry()
{
InitializeComponent();
Focused += OnCustomEntryFocused;
}
private void OnCustomEntryFocused(object sender, FocusEventArgs e)
{
var entry = (Entry)sender;
entry.IsEnabled = false;
entry.IsEnabled = true;
}
}
一种方法就像上面 Brandon Minnick 所说的,使用IsEnable
属性来禁用它的焦点。
这是另一种方法,您应该在您的 Android 项目中创建一个自定义渲染器:
[assembly: ExportRenderer(typeof(CustomEntry), typeof(MyEntryRenderer))]
namespace EntryCa.Droid
{
class MyEntryRenderer:EntryRenderer
{
public MyEntryRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (Control != null)
{
// do whatever you want to the UITextField here!
Control.InputType = Android.Text.InputTypes.Null;
}
}
}
}
然后在您的 PLC 项目中:
public partial class CustomEntry :Entry
{
}
在您的 page.xaml 中:
<local:CustomEntry Placeholder="hi" ></local:CustomEntry>
您会看到当您对 Entry 进行融合时,它不会弹出键盘。
如果您想在活动开始时隐藏键盘,请在您的活动中添加以下内容:
WindowSoftInputMode = Android.Views.SoftInput.StateAlwaysHidden
[Activity(Label = "MainActivity", WindowSoftInputMode = Android.Views.SoftInput.StateAlwaysHidden)]
public class MainActivity : Activity
{ }
要以编程方式隐藏键盘,请使用此功能:
private void DismissKeyboard()
{
var view = CurrentFocus;
if (view != null)
{
var imm = (InputMethodManager)GetSystemService(InputMethodService);
imm.HideSoftInputFromWindow(view.WindowToken, 0);
}
}
或者这个功能:
private void DismissKeyboard2()
{
var currentFocus = this.CurrentFocus;
if (currentFocus != null)
{
InputMethodManager inputMethodManager = (InputMethodManager)this.GetSystemService(Context.InputMethodService);
inputMethodManager.HideSoftInputFromWindow(currentFocus.WindowToken, HideSoftInputFlags.None);
}
}
或者一起使用主题,例如:
myEditText.FocusChange += (object sender, View.FocusChangeEventArgs e) =>
{
DismissKeyboard();
DismissKeyboard2();
};
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