构建项目遇右侧边框填充段过多错误，求排查9-Patch文件问题

Hey there, let's get this sorted out—your error: too many padding sections on right border is definitely tied to a misconfigured 9-Patch drawable, so let's break down what's wrong and how to fix it.

Why This Error Happens #

9-Patch drawables have strict rules for their border markers, and the right border specifically has a non-negotiable rule: it can only contain one continuous vertical segment to define the vertical padding range for your content. If you've got multiple disconnected lines, dots, or segments on the right border, the compiler throws this error because it doesn't know which vertical range to use for content placement.

How to Fix Your 9-Patch File #

Grab your 9-Patch image and open it in Android Studio's built-in 9-Patch Editor (right-click the file > Open with > 9-Patch Editor), then follow these steps:

• Inspect the right border: Look for any disconnected lines, stray dots, or multiple separate segments. Delete all of these—only leave one single, unbroken vertical line along the right edge.
• Recall core 9-Patch rules for clarity:
  • Top border: Defines horizontal stretch areas (can have multiple segments)
  • Left border: Defines vertical stretch areas (can have multiple segments)
  • Right border: Defines single continuous vertical content padding range (only one segment allowed)
  • Bottom border: Defines single continuous horizontal content padding range (only one segment allowed)
• Test the preview: Use the editor's preview pane to make sure the stretch and padding behave as expected for your dropdown background.

Quick Check for Your drop_down_drawable.xml #

Even though your code snippet is cut off, a quick reminder for your layer-list:

• When referencing your fixed 9-Patch file, use the correct syntax: @drawable/your_9patch_name (note: you don't include the .9 suffix in the reference, even though the file is named your_9patch_name.9.png)
• If you're combining a shape with a 9-Patch in the layer-list, make sure their corner radii and padding align to avoid visual glitches in your dropdown.

If you're still stuck, try recreating the 9-Patch from scratch—sometimes starting fresh avoids accidental stray markers that are easy to miss in existing files.

内容的提问来源于stack exchange，提问作者Prashant Jajal