Software⏱️ 2 min read📅 2026-06-03

How to Fix: Android Room - simple select query - Cannot access database on the main thread

Learn how to fix: Android Room - simple select query - Cannot access database on the main thread.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The 'Cannot access database on the main thread' error occurs when you attempt to execute a Room query on the main thread. This is not allowed in Android as it can cause the app to freeze or become unresponsive.

⚠️ Common Causes

  • Executing Room queries on the main thread

✅ Best Solutions to Fix It

Method 1: Execute Queries on a Background Thread

  1. Step 1: Create a background thread using Worker or RocketMQ
  2. Step 2: Execute the Room query on the background thread

Method 2: Use a Coroutines Library

  1. Step 1: Import and add the Coroutines library to your project
  2. Step 2: Use CoroutineScope to execute the Room query on a background thread

✨ Wrapping Up

By following these methods, you can successfully access your Android Room database without running into the 'Cannot access database on the main thread' error.

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