VS2017 15.5.5配置Xamarin Android4.1项目遇错误求解决方案

Hey there, let's work through this step by step to get your Xamarin Android project running smoothly for Android 4.1+ on VS2017 15.5.5. Here's a straightforward configuration plan tailored to your situation:

Start with a fresh slate to eliminate cached issues:

• Right-click your solution → Select Clean Solution
• Manually delete the bin and obj folders from your Android project directory (these hold compiled artifacts that often cause conflicts)
• Restart Visual Studio to clear any in-memory cache

The mistake here was lowering the target framework to Android 4.1—modern support libraries don't work with such old frameworks. Instead:

1. Right-click your Android project → Open Properties
2. Go to the Application tab:
   • Minimum Android version: Set to Android 4.1 (API Level 16) (this covers your required compatibility)
   • Target framework: Choose Android 8.1 (API Level 27) (this is a stable version that works well with VS2017 15.5.5 and maintains backward compatibility with 4.1)
   • Target Android version: Select "Use compile using Android version (API 27)" (matches your target framework)

The Xamarin.Android.Support.Design package error comes from mismatched or outdated support library versions. Here's how to fix it:

1. Open NuGet Package Manager (right-click project → Manage NuGet Packages)
2. Go to the Installed tab, uninstall all Xamarin.Android.Support.* packages (including Design, Library, AppCompat, etc.)
3. Switch to the Browse tab, search for Xamarin.Android.Support.Library and install version 27.0.2.1 (this version is fully compatible with VS2017 15.5.5 and API 27)
   • Ensure all support packages you install are the same version—never mix different versions
4. If you still see NU1202 errors, open the NuGet Package Console and run:

   Update-Package -reinstall
   

   This forces a fresh install of all packages with correct dependencies.

You deleted some critical files earlier—let's bring back the basics without extra bloat:

1. Create a new Toolbar.axml file in Resources/layout with this default content:

   <?xml version="1.0" encoding="utf-8"?>
   <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/toolbar"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:background="?attr/colorPrimary"
       android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
       android:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
   

2. Ensure Resources/values/styles.xml has a basic AppCompat theme:

   <resources>
       <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
           <item name="colorPrimary">@color/colorPrimary</item>
           <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
           <item name="colorAccent">@color/colorAccent</item>
       </style>
   </resources>
   

3. Check that Resources/values/colors.xml exists with defined color values (e.g., <color name="colorPrimary">#3F51B5</color>) to avoid "resource not found" errors.

• Right-click your solution → Select Rebuild Solution
• If you still see resource identifier errors, double-check all layout files for typos in control IDs, then run Clean Solution again before rebuilding.

This setup keeps your project compatible with Android 4.1+ while using a modern enough framework to support necessary libraries, eliminating the compatibility and resource errors you're facing.

内容的提问来源于stack exchange，提问作者Jiri Stepanek