Xamarin.Android中图像资源的正确使用方式是什么？

Hey there! Based on your code snippet and setup, you're already on the right track, but there are a few key details to tweak for proper Android resource handling:

• Fix Resource File Naming
  Android's resource system is case-sensitive and requires filenames to use only lowercase letters, numbers, underscores, or hyphens. Your current filenames GreenButtonIcon and PhysicsIcon will cause compilation errors or "resource not found" issues. Rename them to something like green_button_icon.png and physics_icon.png (lowercase with underscores is the standard for readability).

• Understand background vs src
  Your usage of background for the button's base image and src for the foreground icon is totally correct! Here's a quick breakdown to confirm:

  • background: Fills the entire bounds of the ImageButton and doesn't respect the scaleType property (that setting only applies to the src content).
  • src: The foreground icon that follows your scaleType="fitXY" rule, stretching to match the 50dp x 50dp button size—this makes perfect sense for your layout.

• Optimize Resource Placement
  While storing images in Resources/Drawable works, for sharper displays across different devices, organize your images into density-specific folders:

  • drawable-mdpi (medium density)
  • drawable-hdpi (high density)
  • drawable-xhdpi (extra high density)
  • drawable-xxhdpi (extra extra high density)
  • drawable-xxxhdpi (extra extra extra high density)
    Drop appropriately scaled versions of your images into each folder, and Android will automatically pick the best fit for the user's device. If you only have one version of each image, keeping them in drawable (which defaults to mdpi) is okay, but density-specific folders will boost visual quality on high-res screens.

• Corrected Code Snippet
  Here's your code updated with proper naming conventions:

  <ImageButton 
      p1:id="@+id/physicsOption" 
      p1:layout_column="0" 
      p1:layout_columnSpan="1" 
      p1:layout_columnWeight="1" 
      p1:layout_row="0" 
      p1:layout_rowSpan="1" 
      p1:layout_rowWeight="1" 
      p1:layout_height="50dp" 
      p1:layout_width="50dp" 
      p1:padding="10dp" 
      p1:scaleType="fitXY" 
      p1:background="@drawable/green_button_icon" 
      p1:src="@drawable/physics_icon" />
  

• Quick Troubleshooting Tip
  If you hit "resource not found" errors after renaming files, clean your Xamarin solution (Build > Clean Solution) and rebuild. This clears cached resource references that might be stuck on the old filenames.

内容的提问来源于stack exchange，提问作者Jacob Chesley