Xamarin C# - Android - 防止 AlertDialog 在 PositiveButton 单击时关闭
2022-09-03 09:36:42
我是Xamarin的新手,我不知道如何在c#中执行以下操作。我想防止警报对话框在单击“正/负”按钮时关闭。我需要先对输入进行一些验证。如果输入正确,对话框可以关闭,否则我将显示一条带有说明的消息。基本上,我有以下代码:
private void CreateAddProjectDialog() {
//some code
var alert = new AlertDialog.Builder (this);
alert.SetTitle ("Create new project");
alert.SetView (layoutProperties);
alert.SetCancelable (false);
alert.SetPositiveButton("Create", HandlePositiveButtonClick);
alert.SetNegativeButton("Cancel", HandelNegativeButtonClick);
}
private void HandlePositiveButtonClick (object sender, EventArgs e) {
//Do some validation here and return false (prevent closing of dialog) if invalid, else close....
}
现在,我红了StackOverflow上的以下帖子:如何防止在单击按钮时对话框关闭
我认为下面的代码(取自线程)有解决方案,但我不知道如何重写我的c#代码来实现Java:
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage("Test for preventing dialog close");
builder.setPositiveButton("Test",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//Do nothing here because we override this button later to change the close behaviour.
//However, we still need this because on older versions of Android unless we
//pass a handler the button doesn't get instantiated
}
});
AlertDialog dialog = builder.create();
dialog.show();
//Overriding the handler immediately after show is probably a better approach than OnShowListener as described below
dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Boolean wantToCloseDialog = false;
//Do stuff, possibly set wantToCloseDialog to true then...
if(wantToCloseDialog)
dismiss();
//else dialog stays open. Make sure you have an obvious way to close the dialog especially if you set cancellable to false.
}
});
如何在c#中对此进行编码?特别是 setPositiveButton 区域中的覆盖部分...