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Create and return the view hierarchy used for the input area (such as a soft keyboard). This will be called once, when the input area is first displayed. You can return null to have no input area; the default implementation returns null.
To control when the input view is displayed, implement InputMethodService.OnEvaluateInputViewShown. To change the input view after the first one is created by this function, use InputMethodService.SetInputView(Android.Views.View).