Xamarin Android无法访问绑定Java库CompactCalendarView的指定方法？

Hey there, let's work through this frustrating issue together! It's annoying when most of your Xamarin binding works smoothly but a specific method goes missing—here are targeted troubleshooting steps to get GetFirstDayOfCurrentMonth() up and running:

1. Confirm the Binding Library Exposes the Method #

First, double-check if the NuGet binding package you're using actually includes this method. Xamarin bindings sometimes miss methods if the original Java library was updated but the binding hasn't caught up, or if there was a glitch during binding generation.

• Open Visual Studio's Object Browser (View > Object Browser)
• Navigate to your CompactCalendarView NuGet reference and locate the CompactCalendarView class
• Check if GetFirstDayOfCurrentMonth() is listed as a member. If it's not present:
  • Try updating to the latest version of the NuGet package (if an update exists)
  • File an issue with the package maintainer to request adding the missing method
  • Generate your own custom Xamarin binding for the latest version of the Java CompactCalendarView library

2. Use Java Reflection as a Quick Workaround #

If the binding doesn't include the method, you can bypass the Xamarin wrapper and call the native Java method directly using reflection. Adjust your code like this:

TextView monthAndYear = FindViewById<TextView>(Resource.Id.monthYearDisplay);

// Access the underlying Java object from the Xamarin wrapper
var calendarJavaObj = eventCalendarView.JavaCast<Java.Lang.Object>();
// Fetch the original Java method using its camelCase name
var getFirstDayMethod = calendarJavaObj.Class.GetMethod("getFirstDayOfCurrentMonth");
// Invoke the method and cast the result to a Java.Util.Date
var firstDayOfMonth = (Java.Util.Date)getFirstDayMethod.Invoke(calendarJavaObj);

monthAndYear.SetText(dateFormatForMonth.Format(firstDayOfMonth));

This skips the missing Xamarin binding layer and calls the Java method directly.

3. Double-Check Your Namespaces & Using Statements #

Even with the three using directives you added, make sure you're referencing the correct namespace for the binding. Some bindings map the original Java package com.github.sundeepk.compactcalendarview to a different C# namespace (like CompactCalendarView or Sundeepk.CompactCalendarView). Confirm the namespace matches what's defined in the binding library.

4. Clean & Rebuild to Clear Cache Glitches #

Visual Studio's build cache can sometimes trigger false CS1061 errors. Try these steps to rule that out:

• Right-click your solution and select Clean Solution
• Delete the bin and obj folders from your project directory
• Rebuild the solution from scratch

Hopefully one of these steps gets your calendar method working again!

内容的提问来源于stack exchange，提问作者W. Hoffman