Coding⏱️ 2 min read📅 2026-05-31

How to Fix: AppCompat v7 r21 returning error in values.xml?

Error in values.xml file due to outdated appcompat-v7 library version.

Quick Answer: Update the appcompat-v7 library to a newer version, such as 21.0.1 or later, to resolve the issue.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

[2 paragraphs intro]

🔍 Why This Happens

  • [Cause]

🔧 Proven Troubleshooting Steps

Method 1: Update AppCompat Version

  1. Step 1: Update your Gradle file to use the latest version of AppCompat, for example, compile 'com.android.support:appcompat-v7:28.0.0'.

Method 2: Use AppCompat V7 Library with Support Library

  1. Step 1: Add the following dependency to your build.gradle file:
    dependencies { implementation 'com.android.support:appcompat-v7:21.0.0' },
    and implementation 'com.android.support:support-compat:21.0.0'.

✨ Wrapping Up

[Wrap-up]

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